第三章 船舶电气与船舶安全(-170).ppt

第三章第三章 船舶电气与船舶安全船舶电气与船舶安全1886 The staring current of an a.c. motor is ______the rated current. 交流电机的启动电流比额定电流大得多 A. the same as B. much larger than C. less than D. equals1887 Ammeter is to measure the ______安培表用来测量电流 A. current B. voltage C. power D. frequency1888In a modem three-phase A.C. synchronous brushes generator, the excitation winding is on the rotor. That means ______对于现代三相交流同步有刷的发电机，励磁线圈在转子上。

意即转子上的线圈用于输入励磁电流 A. The generator need not excitation B. The winding on the rotor is for inputting excitation current C. There are three phase windings on the rotor D. The generator has brushes1889 The over current relay ______ the motor contactor when the motor exceeds its rated current .当电动机超过额定电流时，过电流继电器将跳开 A. connects B. trips C. fouls D. destructs 1886 B 1887 A 1888 B 1889 B 1890The ______ is a measure of the phase difference between voltage and current 1891 and is expected as the cosine of phase angle.功率因数可用来表示电压与电流之间的相位差，表达成相位角的余弦。

A. power B. efficiency C. effective power D. power factor1891 Current changing in direction and rising and falling in value is ______ 方向、大小都变化的电流是交流电 A.A.C. B.D.C. C. generator D. fresh water generator1892 The operation of paralleling two alternators requires the voltages to be ______ and also in phase. 两台交流发电机并联，需要电压相等，并且同相 A. zero B. eliminated C. different D. equal1893 The ______ , cage rotor induction motor is the first choice marine motor in most modem ships because of its electrical and mechanical simplicity.现代船舶上使用的电机都是三相电机。

A. single phase B. two phase C. three phase D. four phase1894 The star-delta starter is an effective method of ______ voltage starting of a motor.采用Y—△启动器是电饥低电压启动的最好方法 A. increased B. reduced C. unchanged D. None of the above 1890 D 1891 A 1892 D 1893 C 1894 B 1895With a ______ load the voltage and current are in phase. 1896对于纯电阻负荷，电压和电流同相1897A. purely resistance B. capacitive C. inductive D. None of the above1896 Increasing the temperature of a fuel will ______ its viscosity.提高燃油的温度将降低其粘度。

A. increase B. reduce C. keep D. None of the above is true.1897 The ______ is used to measure the volume of a liquid or gas through a pipelin within any given period of time.流量计用于测量在给定时间内，通过管子的液体或气体的体积 A. flowmeter B. viscometer C. micrometer D. feeler1898 " gauge pressure " means ______ “表压”即是“超过大气压的压力” A.vacuum B. "the excess of pressure above atmosphere" C. "figure on a gauge" D. Any of the above1899 A manometer is used to measure _____压气计用来测量压力。

A. pressure B. temperature C. volume D. specific gravity1900 The viscosity regulator controls the fuel oil temperature______ provide oil at the correct viscosity for combustion.粘度调节器通过控制燃汕的温度实现粘度的控制 A. in order that B. because of C. in order to D. owing to 1895 A 1896 B 1897 A 1898 B 1899 A 1900 C1901A viscosity regulator used for an engine is usually provided in order to for an ______ engine burning heavy fuel oil .柴油机的粘度调节器能保持燃油粘度恒定。

A. regulate the fuel supply B. maintain a constant fuel viscosity at the fuel valves C. maintain efficient cooling D. alter the fuel density1902 Oil mist detectors are usually used on board to detect oil mist density within ______大型低速柴油机上的油雾检测器用于检测曲柄箱内滑油蒸汽的存在 A. the engine crankcase B. the engine scavenge boxes C. drain tanks D. fuel tanks1903 UMS stands for ______ UMS代表“无人机舱’’ A. ultra much space B. universal medium system C. unit machined space D. unattended machinery space1904 The main generators are connected to ______主发电机与主配电板相连。

A. distribution boards B. section boards C. emergency switch boards D. main switch boards 1901 B 1902 A 1903 D 1904 D1905 The emergency generator or emergency battery is connected to ______ on most large ships.应急发电机或应急蓄电池与应急配电板相连 A. distribution boards B. section boards C. emergency switch boards D. main switch boards1906Switchboards may be of the dead-front type in which all live parts are installed behind1907 ______ and only the operation handles and instruments are on the front在表面不带电式的配电板中，带电部件安装在面板的后面，只有操作手柄和仪表在 前面。

A. the capstan B. the collector C. the panels D. the surface1907 Remote control means that _____遥控，意即“系统位于远离操作者处” A. the system is manned manually B. the system is situated remotely from the operator C. the system is controlled automatically D. all the above1908 The ______ is a crystal which, under pressure, produces an electric current which varies with the pressure.压电式传感器是一种晶体，在压力下能产生电流，电流大小随压力变化而变化 A. alternator B. glass thermometer C. burdon tube D. piezoelectric pressure transducer1909 handle and instruments are on the front.题干表达有误。

可参考第1906题 A. open B. open front type C. live front type D. None of the above 1905 C 1906 C 1907 B 1908 D 1909 B1910 With UMS, when the engine room is unwatched_____will control the main engine. 对于无人机舱，由值班驾驶员来控制主机 A. the bridge officer on watch B. the chief engineer C. the duty engineer D. the duty motorman1911 The difference between measured and desired values is called______ 测量值和所需要值之间的差，称为“偏差”A. make-up B. desired value C. deviation D. set value1912systems are provided with a stand-by device which will automatically be ______ 1913 put in use in the even of the running device failing through a fault condition. 备用设备装有自动启动系统，当运转设备故障时，便能自动投人使用。

A. Mann B. Monitoring C. Auto start-up D. None of the above1913The operating medium for control systems may be ______ 1914 控制系统的操作介质可以是压缩空气、液压油或电力 1915 A. compressed air B. hydraulic oil C. electricity D. All of the above 1914 ______ power is the power developed within the cylinder and can be measm'ed by an engine indicator.指示功是气缸内发出的功率；可通过示功图来测量 A. The shaft B. The mechanical C. The electric D. The indicated 1915 ______ control system is one in which the control action is independent of the out- put. 控制作用与输出量无关，这种控制系统是开环控制。

A. Feed back B. Negative feed back C. Close loop D. Open loop 1910 A 1911 C 1912 C 1913 D 1914 D 1915 D1916Prior to any overhaul work on electric equipment, it is important to ensure the circuits 1917 are ______对电气设备检修前，应确保电路切断 A. live B. dead C. excited D. on line 1917 Moisture in a D.C. motor would cause ____水分会引起直流电机短路 A. short circuit B. speed up C. slow down D. hunting 1918 On commonly used ships, if two A.C. generators are operated in parallel, the load is distributed evenly by ____两台交流发电机并联运行时，负荷可以通过调节原动机的转速的方法来实现。

正确答案应为 A. varying the D.C. exciter voltage B. varying the reluctance of the air gap C. regulating the speed of prime mover D. shorting out part of the armature windings 1919 Electric insulation is made of organic substances and so gradually ______ with age. 电器绝缘材料是由有机物质组成，随着时间的推移，性能会逐渐恶化 A. deteriorates B. increases C. are fouled D. becomes better 1920 Electric insulation is made of organic substances and so gradually ______ with age.见上题。

A. deteriorates B. increases C. are fouled D. becomes better 1916 B 1917 A 1918 D 1919 A 1920 A 1921 The system will include various ______ such as low tank level alarms and remote operation of tank outlet valves in the events of a fire. 油舱低位报警和速闭阀等都属于安全设备 A. Switches B. panels C. alarm units D. safety devices 1922 is used to produce electric power. ____交流发电机用来产生交流电 A. An alternator B. fresh water generator C. A compressor D. A clarifer 1923 The coil of wire rotating in the magnetic field produces the ______ 在磁场中旋转的线圈能产生电流。

A. voltage B. current C. power D. frequency1924 Shore power must be ______ during dock repair.坞修期间，必须接岸电 A. disconnected B. switched off C. cut off D. connected1925The current flowing first in one direction and then in another is called 1926 ______ current.方向改变的电流是交流电 A. an alternating B. a rush C. a direct D. an exciting 1921 D 1922 A 1923 B 1924 D 1925 A 1926 Electrical supply is always needed even if only for lighting so after a ship goes into service it is extremely rare for the main bus-bars to be dead, it therefore follows that the bus-bars are continuously alive ______ the life of the ship . 船舶的主母线在整个船舶使用期内都是持续有电的。

A. along B. will C. throughout D. for1927 The switchboards for a . c. systems differ from the d.c. switch gear in that the open type panels are generally ______ and the dead-front switch gear is the comn~n rule. 用作交流系统的配电板与用作直流系统的配电板不同之处在于一般不允许使用开式面板，而常用表面不带电式A. permissibly B. permissible C. no permissible D. not permissible1928 You must take good care of the drainage cock of the air control system. Because ______ leads scale formed which might malfunctions the pilot control valve and other instruments.必须仔细保养空气控制系统的放残考克。

因为水分会引起水垢形成，从而使得控制阀和其他仪表产生故障 A. the temperature B. the mst C. the pressure D. the humidity1929 The liquid flowing in the capillary is such that the difference in ______ readings taken before the capillary and after it is related to the oil viscosity.对于在毛细管内流动的液体，毛细管前后的压差读数与油的粘度有关 A. pressure B. velocity C. flow rate D. temperature1930 ______ shall be continuously powered and shall have an automatic changeover to a stand by power supply in case of loss of normal power supply .报警系统应持续供电。

A. Cooling system B. Alarm system C. The air conditioning installation D. The mooting equipment 1926 C 1927 D 1928 D 1929 A 1930 B1931 ______ is a machine by which electrical energy is transformed into mechanical energy.将电能转化为机械能的是电动机 A. An alternator B. An electric motor C. A diesel engine D. A main switchboard 1932 Current changing in direction and rising and falling in value is ___见第1891题。

A. A.C. B. D.C . C. generator D. fresh water generator 1933 Switchkx)ards may be of the dead-front type in which all live parts are installed behind ______ and only the operation handles and instruments are on the front见第1906题 A. the capstan B. the collector C. the panels D. the brake1934 After a ship enters service it is ______ for the main bus-bar to be made dead. 船舶投人使用后，主母线不带电是极其少见的 A. usually B. commonly C. exceptional D. unavoidably1935The separate supplies are connected in either star or delta formation. The star formation is most commonly used and requires ______ slip-rings on the 1936 alternator. Y形连接需要4个滑环。

A. two B. three C. four D. five1937 1931 B 1932 A 1933 C 1934 C 1935 C 1936 The operation of paralleling two altermators requires the voltages to be and ______ also in phase.见第1892题 A. zero B. eliminated C. different D. equal1937With a purely ______ load the voltage and current are in phase, giving a power1938 factor of one.见第1895题 A. inductive B. resistance C. combined D. capacitate1938 The operation of ______ two altermators requires the voltages to be equal and also in phase.见第1892题。

A. paralleling B. series-mounting C. running D. control1939 Which of the following marine examples belongs to the open loop control system?只有舱室的加热系统可以采用开环控制 A. Accommodation heating system B. Steering gear C. Boiler control D. Cargo control1940 is the actual value of the controlled condition. ______ 测量值就是控制条件的实际值A. Desired value B. Set value C. Measured value D. Deviation 1936 D 1937 B 1938 A 1939 A 1940 C1941 The difference between measured and desired values is called ______ 见第1911题。

A. offset B. error C. deviation D. set value1942 The overcurent relay ______ the motor contactor when the motor exceeds its rated current .见第1889题 A. connects B. trips C. fouls D. destructs1943 Electric insulation is made of organic substances and so gradually ______ with age.见第1919题 A. deteriorates B. increases C. are fouled D. are contaminated1944The ______ is a crystal which, under pressure, produces an electric current which varies with the pressure.见第1908题。

1945 A. alternator B. glass thermometer C. bunion tube1946 D. piezoelectric pressure transducer19471945 Domestic water pump is started automatically by ______ which operates as the water level falls to a predetermined level.日用水泵是由压力开关自动启动的 A. a level controller B. a temperature switch1948 C. a floating ball D. a pressure switch1949 1941 C 1942 B 1943 A 1944 D 1945 D1946After the trouble of the automatic control system has been completely 1947 eliminated, assistance is ______ required. 自动控制系统的故障已彻底排除，不再需要任何帮 A. remained B. still C. no longer D. much more1947 With UMS, when the engine room is unwatched ______ will control the main engine.见第1910题。

A. the bridge officer on watch B. the chief engineer C. the duty engineer D. the duty motorman1948 The staring current of a motor is ______ the rated current.见第1886题 A. the same as B. much larger than C. less than D. none of the above1949 The alternating current generator supplying a load has a voltage drop resulted from the load. When the load has a lagging power factor this voltage drop ______由于负荷的特性，交流发电机会产生电压降，当负荷具有滞后的功率因数时．该电压下降是很大的。

A. is small B. may be neglected C. is useful D. is considerable1950 With a purely resistance load the voltage and current are in phase, giving a power factor of ______对于纯电阻的负荷，电压与电流同彻，功率因数为1 A. one B. less than one C. more than one D. negative one 1946 C 1947 A 1948 B 1949 D 1950 A1951The power factor is a measure of the phase difference between voltage and 1952 current and is expressed as the ______ of the phase angle.见第1890题 A. sine B. cosine C. tangent D. cotangent 1952 The field coils ______ and the armature is ______ . Ibis is in fact the arrangement adopted for large, heavy duty alternators.常用大型交流发电机的结构，线圈是旋转的而电枢是静止的。

A. stationary/rotate B. stationary/stationary C. rotate/stationary D. rotate/rotate1953The star formation is most commonly used and requires ______ on the alternator. 1954见第1935题A. one slip-ring B. two sliprings C. three sliprings D. four sliprings1954 An a.c. switchboard is usually ______ the corresponding d.c. board because of the higher voltage and lower currents and smaller bus-bars.交流配电板比相应的直流配电板尺寸小、重量轻 A. larger and heavier than B. as much as C. smaller and lighter than D. more dangerous than1955 The magnetic field is provided by electromagnets so re'ranged that adjacent poles have ______磁场有电磁铁提供，其布置应使相邻的极具有相反的极性 A. opposite polarity B. the same polarity C. negative polarity D. positive polarity 1951 B 1952 C 1953 D 1954 C 1955 A 1956To parallel an incoming machine to a running machine therefore it is necessary to ensure firstly that 1957 ______见第1892题。

A. two frequencies must be brought into phase B. the incoming machine accepts a small amount of load C. the running machine must be unload D. both voltages are equal 1957 is provided to alternators, in the event of prime mover failure to ensure that ______ the alternator does not act as a motor.交流发电机装备逆功率保护设备，是为了防止当发电原动机故障时，刁<能当作马达使用 A. Reverse current protection B. Reverse power protection C. Synchronising device D. Frequency meter ] 958 With a purely ______ load the voltage and current are in phase, giving a power fac- tor of one.见第1950题。

A. inductive B. capacitive C. combined D. resistance 1959 When two different metals are joined to form a closed circuit and exposed to different temperatures at their junctions ______ which can be used to measure temt~mture.当两种不同的金属连接形成封闭回路，连接处与不同的温度接触，将会产生电流．据 此可用来测量温度此为热电偶的工作原理A. a current will flow B. a power will develop C. a heat will flow D. a pressure will produce 1960 Movement of the diaphragm or bellows is ______ by a linkage to a needle or pointer display to indicate the differential pressure between two sides of the diaphragm or bellows.膜片或波纹管的移动通过连接装置传递到指针。

以显示膜片或波纹管两侧的压差A. measured B. recorded C. transferred D. controlled 1956 D 1957 B 1958 D 1959 A 1960 C1961Bourdon Tube is probably the most commonly used______ measuring 1962 instrument.波登管是最常用的表压力测量仪表A. the absolute pressure B. the gauge pressure C. the vacuum pressure D. the differential pressure1962 This arrangement is ______ if the elements are directly connected to one another and the control action takes place without human involvement.一步如果控制回路中，部件与部件之间直接相连，控制作用不需要人员的介入就能完成这种控制形式就是自动闭环控制。

A. a manual closed loop B. a manual opened loop C. an automatic closed loop D. an automatic opened loop1963 In______ the control action is independent on the output. 控制作用与输出量无关，即为开环控制 A. a closed loop control system B. an open loop control system C. a boiler control system D. a steering gear control system1964 Usually the panels are interlocked with_____so that the devices can be made dead before the doors are opened.通常，面板与隔离开关是相互联锁的，这样在门打开之前，设备是不带电的。

A. protective earth B. isolators C. ground switch D. circuit-breakers1965 It _____ for an emergency generator to require paralleling.对于应急发电机来说，一般不需要并联运行(除大型客轮外) A. is usual B. is not usual C. is necessary D. is not impossible 1961 B 1962 C 1963 B 1964 B 1965 B1966The switchboards for a . c. systems differ from the d.c. switch gear in that the open type panels are generally _____ and the dead-front switch gear is the common rule.见第1927题 A. permissibly B. permissible C. no permissible D. not permissible1967 _____ is used to produce electric power.见第1922题。

A. An alternator B. A fresh water generator C. A compressor D. A clarifer1968 The magnetic field is provided by electromagnets so arranged that adjacent poles have _____见第1955题 A. opposite polarity B. the same polarity C. negative polarity D. positive polarity1969 Domestic water pump is started automatically by _____ which operates as the water level falls to a predetermined level.见第1945题 A. a level controller B. a temperature switch C. a pressure switch D. a floating ball1970 Brushless generators are designed to operate without the use of _____ 无刷发电机，不需要碳刷、滑环和换向2S等装置。

A. brushes B. slip rings C. commutators D. all of the above 1966 D 1967 A 1968 A 1969 C 1970 D1971A ground can be defined as an electrical connection between the wiring of a motor and 1972 its _____电机接地可以定义为，电机的电线与金属壳体之间的电气连接 A. shunt field B. circuit breaker C. metal framework D. inter-pole1972 The output voltage of a 440 volt, 60 hertz, AC generator is controlled by the _____ 对于440V，60Hz的交流发电机的输出电压，是由励磁机的输出电压来控制的 A. prime mover speed B. exciter output voltage C. load on the alternator D. number of poles1973 Any electric motor can be constructed to be ___任何交流电动机都应该防爆。

A. short proof B. ground proof C. explosion proof D. overload proof1974 Which of the following statements represents the main difference between a relay and a contactor _____接触器与继电器的主要区别是它能承受较大的负载 A. Contactors control current and relays control voltage. B. A relay is series connected and a contactor is parallel connected. C. Contactors can handle heavier loads than relays. D. Contactors are made from silver and relays are made from copper.1975 An accidental path of low resistance, allowing passage of abnormal amount of current is known as a/an _____产生低电阻、高电流，即发生短路。

A. open circuit B. short circuit C. polarized ground D. ground reference point 1971 C 1972 B 1973 C 1974 C 1975 B1976A resistance in a circuit of unknown value is to be tested using the voltmeter/ammeter1977 method. Therefore, the meters should be connected with _____ 电流表应与电阻串联，而电压表应与电阻并联 A. both meters in series with the resistance B. both meters in parallel with the resistance C. the ammeter in series and the voltmeter in parallel with the resistance D. the ammeter in parallel and the voltmeter in series with the resistance1977 Which of the following electric motors would be the safest and most reliable to use on the main deck of a vessel in foul weather conditions?在潮湿气候状况下，船舶主甲板上使用最安全、最可靠的电动机是水密性电动机。

A. Sealed motors B. Drip proof motors C. Enclosed motors D. Watertight motors1978 A direct current passing through a wire coiled around a soft iron core is the description of a simple _____直流电通过绕在软铁芯上的电线，这就是简单的电磁铁的结构 A. magnetic shield B. electromagnet C. piezoelectric device D. electromagnetic domain1979 Which of the listed devices is used to measure pressure and convert it to an electrical signal?压力传感器能测量压力，并把它转换成电信号 A. Transducer B. Reducer C. Transformer D. Rectifier1980The device that most commonly utilizes the principle of electromagnetic induction is the _____普遍利用电磁铁感应原理的设备是变压器。

A. diode B. transformer C. transistor D. rheostat 1976 C 1977 D 1978 B 1979 A 1980 B1981One factor that determines the frequency of an alternator is the _____ 1982决定交流发电机频率的一个因素是磁极的数目 A. number of turns of wire in the armature coil B. number of magnetic poles C. strength of the magnets used D. output voltage1982Which of the motors for the devices listed below is fitted with an instantaneous 1983 overload relay? ．一般地说，起货机装有瞬时过载继电器。

A. Fan B. Pump C. Winch D. Machine tool1983 The Wheat-stone bridge is a precision measuring instrument utilizing the principle of changes in _____惠斯登电桥是一种利用电阻变化的原理的精确测量仪表 A. inductance B. capacitance C. resistance D. amperage1984 The greatest detrimental effect on idle electrical equipment, such as cargo pump motors, is the _____对于闲置的电气设备，如货物泵电动机，最大的伤害是绝缘材料吸收水分 A. loss of residual magnetism B. absorption of moisture in the insulation C. insulation varnish flaking D. dirt collecting on the windings1985 he frequency output of an operating alternator is controlled by the _____ 对于运转中的发电机，输出频率是由转子电极之间的相对速度来控制。

A. relative speed of the rotor poles B. number of tums of wire in the annature coil C. strength of the magnets used D. output voltage 1981 B 1982 C 1983 C 1984 B 1985 A1986 An electrical device which prevents an action from occurring until all other required conditions are met is called a/an _____ 用来防止产生动作，直到其他所需要的条件都满足，这种电器设备被称为联锁设备 A. limit B. monitor C. modulator D. interlock1987A circuit breaker and a fuse have a basic similarity in that they both _____1988电路切断器和熔断丝具有基本相同的作用——过载时，都能切断电流。

1989 A. can be reset to energize the circuit B. should open the circuit when overloaded C. will bum out when an over current flow develops D. All of the above1988 The electrolyte in a lead-acid storage battery consists of distilled water and _____ 铅一酸蓄电池的电解质是由蒸馏水和硫酸组成A. hydrogen chloride B. calcium chloride C. sulfuric acid D. muriatic acid1989 Electrical leads and insulation on a motor should be painted with _____ 电动机上的绝缘材料应刷绝缘漆 A. heat-resisting acrylic B. heat-resisting aluminum C. insulating varnish D. insulating white lead1990Voltage generated by most AC generators is fed from the machine to the bus by means of ____绝大多数交流发电机产生的电压，通过来自于静子的直接连接线，从发电机输送到母线。

A. brushes on a commutator B. brushes on slip tings C. slip rings on a commutator D. direct connections from the stator 1986 D 1987 B 1988 C 1989C 1990 D1991A circuit breaker differs from a fuse in that a circuit breaker _____ 1992电路切断器和熔断丝不同之处是它既能切断电路又能复位1993A. melts and must be replaced B. is enclosed in a tube of insulating material with metal ferrules at each end C. gives no visual indication of having opened the circuit D. trips to break the circuit and may be reset1992 As a general rule, the first troubleshooting action to be taken in checking faulty electric control devices is to _____ 对电力控制设备进行故障诊断时，一般首先足试验所有的熔断丝并测量线路电压 A. draw a one line diagram of the circuitry B. test all fuses and measure the line voltage C. take megger readings D. insulate the apparatus from ground1993 An electrical device which employs a stationary armature and a rotating electromagnetic field is used aboard ship as a _____ 船舶上，使用静止的电枢和旋转的电磁场的电力设备是船川发电机。

A. magnetic amplifier B. ship s service alternator C. three-wire DC generator D. saturable core reactor1994 The first requirement for logical troubleshooting of any system is the ability to _____ 对于任何系统进行逻辑性故障诊断，首要的是应具有识别正常运行状态的能力 A. collect all available data on a casualty B. recognize normal operation C. identify the probable cause of a symptom D. isolate the faulty component 1991 D 1992 B 1993 B 1994 B 1995The load sharing characteristics of two diesel generators operating in parallel are 1996 mostly dependent on their governor _____ 并联运行的两台发电机的负荷分配特性，在很大程度上取决于它们的调速器的固定偏差。

A. load limit settings B. idle speed settings C. speed limit settings D. speed droop settings1996 What type of rotor is used in split-phase motors?三相电机常采用鼠笼式转子 A. Drum B. Salient pole C. Squirrel-cage D. Wound-rotor1997 A constant output voltage from an AC generator is maintained by the _____ 交流发电机的输出电压是通过电压调节器米保持恒定的 A. prime mover governor B. exciter generator C. voltage regulator D. reverse power relay1998 A fuse that blows often should be replaced only with a fuse of _____ 经常熔断的熔断丝，只能用推荐的电流、电压值的熔断丝来更换。

A. the recommended current and voltage rating B. higher current and voltage rating C. higher current and lower voltage rating D. lower current and higher voltage rating 1995 D 1996 C 1997 C 1998 A1999 To repair a small electrical motor that has been submerged in saltwater, you should _____对曾浸没在海水里的小型电动机进行修理，应注意用淡水洗并烘干 A. wash it with fresh water and apply an external source of heat B. renew the windings C. send it ashore to an approved service facility D. rinse all electrical parts with a carbon tetrachloride cleaning solvent and then blow dry the motor with compressed air2000 The output voltage of a three-phase alternator is regulated by the _____ 三相交流发电机的输出电压是由供给磁场的直流电压来调节的。

A. AC voltage to the armature B. AC voltage to the field C. DC voltage to the armature D. DC voltage to the field2001 The function of damper windings in a synchronous motor is to _____ 同步电机的阻尼线圈的功能是提供启动转矩 A. eliminate slippage B. provide excitation C. provide starting torque D. increase efficiency 1999 A 2000 D 2001 C 2002Which of the following statements is true concerning all three-phase2003 alternators?对于三相交流发电机，都具有三个独立的、但相同的电枢绕组，并由一个旋转的磁铁产生磁场。

A. Each has three separate but identical armature windings acted on by one system of rotating magnets. B. Each has one armature winding acted on by three identical but separate systems of rotating magnets. C. All three-phase alternators are designed to operate with a 0.8 leading power factor. D. The three phases always provide power to the load through three sets of slip rings and brushes.2003 Time delayed or delayed action-type fuses are designed to _____ 延时作用式熔断丝在瞬时过载时不会熔断。

A. prevent grounds in branch circuits B. prevent opens in motor circuits C. permit momentary overloads without melting D. guard lighting and electronic circuits2004 The part of a fuse that melts and opens the circuit is made of _____ 熔断丝中，熔化的部分是锌或锡铅合金 A. copper and antimony B. steel and babbitt C. aluminum or beryllium alloy D. zinc or an alloy of tin and lead 2002 A 2003 C 2004 D2005What will be the phase angle relationship of a six-pole, three-phase, 2006 rotating field generator _____六极三相交流发电机，相位角是120℃。

A. 60 B. 120 C. 180 D. 36O2006 The main difference between a motor control circuit containing low voltage protection and low voltage release is that the latter contains _____ 具有低电压保护和低电压释放的电机控制电路之间的主要区别是后者具有瞬时接触式启动按钮 A. a magnetic operating coil B. normally open line contacts C. thermal-overload protection D. a momentary-contact start button 2007 Fuses placed in series with a thermal trip-type circuit breaker are used for _____与电路切断器串联的熔断丝用来短路保护。

A. time-delay protection B. short-circuit protection C. short duration surge protection D. sustained overload protection 2008 Ammeters and voltmeters used in sinusoidal AC power systems indicate which of the following values of the waveforms measured.?用于正弦交流电路中的安培表和电压表，测量的值是均方根值A. Peak value B. Boot-mean-square value C. Average value D. Maximum value 2005 B 2006 D 2007 B 2008 B  2009 Before reassembling any machinery, you should _____ 在重新组装机械设备之前，应清洁腐蚀表面并锉掉所有的毛刺。

A. replace all bearings regardless of length of service B. apply a heavy coat of oil to all mating surfaces C. clean any corroded surfaces and file all burrs smooth D. coat all parts with alemite grease2010 The most common source of excitation for synchronous motors is a/an _____ 同步马达的励磁通常来自于直流励磁机 A. low voltage battery B. motor attenuator set C. DC exciter generator D. AC supply2011Since fuse elements are made of zinc or any alloy of tin and lead, the melting point of the fuse 2012 element must be ___由于熔断丝中熔化的部分是锌或锡铅合金，熔断丝的熔点必须低于铜的熔点。

A. higher than that of copper B. lower than that of copper C. equal to that of copper D. reached when the conductor it is protecting becomes "white hot."2012Which of the listed precautions should be taken when cleaning the internals of a motor with compressed air.用压缩空气清洁电机内部时，应采取预防措施，如开启两端能让空气、灰尘逃逸；确 保电切路断器切断并告示；确保压缩空气清洁并尽可能干燥 2013 A. Open the machine on both ends so as to allow the air and dust to escape. B. Be certain that the circuit breaker is opened and tagged on the feeder panel. C. Be certain that the air is clean and as dry as possible. D. All of the above. 2009 C 2010 C 2011 B 2012 D 2013 The purpose of DC generator brushes is to _____ 直流发电机碳刷的作用是将电流引到外部电路。

A. neutralize armature reaction B. conduct electric cun'ent to an outside circuit C. convert DC current to AC current D. provide excitation to a DC generator2014 Power transformers are rated in _____变压器是按千瓦安培来标定的 A. kilowatts B. ampere-turns C. kilowatt-volts D. kilovolt-amperes2015Which of the following types of motors is often designed for use in correcting power 2016 factor?同步式马达设计用来纠正功率因数 A. Polyphase B. Wound-rotor C. Induction D. Synchronous2016 A device which prints out a permanent record of the plant operating conditions is known as the _____用于打印装置运行工况的永久性记录的设备是数据记录仪。

A. analogger B. bell logger C. alarm logger D. data logger2017 Copper is often used as an electrical conductor because it _____ 由于铜的电阻小，常用作导体 A. has high resistance at low temperatures B. has a highly polished surface C. is able to pass current with little opposition D. holds insulation together well 2013 B 2014 D 2015 D 2016 D 2017 C2018 Under which of the listed conditions can the engine room retake the throttle control from the bridge _____在认为必要的任何时候，都可以由驾驶台控制切换到机舱控制。

A. Any time it is deemed necessary. B. Only with the master' s permission. C. After a 10 minute delay to the input command. D. Only after the throttle has been placed in stop.2019 Routine maintenance of lead acid batteries should include _____ 对于铅一酸蓄电池的周期性保养有：保持电极清洁；给电线接头上凡士林；保持连续补充充电等 A. keeping the terminals clean B. coating cable connections with petroleum jelly C. maintaining a trickle charge D. All of the above2020 Electrical circuits are protected against overheating by means of a/an _____ 电路通常使用电路切断器防止过热。

A. circuit breaker B. amplifier C. diode D. capacitor2021 The function of a rectifier is similar to that of a _____ 整流器的作用类似于单向阀 A. trap B. regulating valve C. check valve D. filter2022Most conducting materials such as copper, aluminum, iron, nickel, and tungsten 2023 _____对于铜、铝、铁、镍、钨等导体，电阻随温度的升高而增大2024 A. increase in resistance with increased temperature B. increase in resistance with decreased temperature C. decrease in resistance with increased temperature D. increase in conductance with increased temperature 2018 A 2019 D 2020 A 2021 C 2022 A 2023 In a series circuit, which value will remain unchanged at all places in the circuit.? 在串联电路中，电流是恒定的。

A. Voltage B. Current C. Resistance D. Inductance2024Which of the following components are used to convert alternating current produced in 2025 the generator windings to direct current?换向器和碳刷用于把发电机线圈产生的交流电转换成直流电 A. Armature and equalizer B. Commutator and brushes C. Rotor and interpoles D. Field and exciter 2025 Line losses in a distribution circuit are kept to a minimum by _____ 采用高电压、低电流，可降低输电线路损失 A. adding rubber insulation conductors to the circuit B. using higher current and lower voltage increasing the C. number of thermal relays in the circuit D. using higher voltage and lower current 2026 Reduced voltage applied to a motor during the starting period will _____ 电机启动期间，采用低电压将减少启动电流、延长加速时间。

A. result in decreased acceleration time only B. lower the starting current and increase accelerating time C. cause a greater starting torque D. increase the starting current and pump capacity 2023 B 2024 B 2025 D 2026 B2027The total resistance of a parallel circuit is always _____ 2028 并联电路的总电阻总是比最小的支路电阻低2029 A. larger than the greatest branch resistance2030 B. smaller than the lowest branch resistance C. equal to the sum of the individual branch resistances D. one-half the sum of the individual branch resistances2028 A "dead front" switchboard is one _____ “表面不带电式配电板”即是指采用绝缘开关、无裸露电极的配电板。

A. without switches on it B. with insulated switches and no exposed terminals C. without circuit breakers D. without safety hand rails nor rubber n-ats2029 The sub-multiple prefix “milli” (m) means ____前缀“milli-”表示千分之一(10”) A. one thousandth (10 to the -3rd power) B. one millionth (10 to the -6th power) C. one billionth (10 to the-9th power) D. one trillionth (10 to the -12th power) 2027 B 2028 B 2029 A2030When you are making a high potential test on a piece of repaired electrical 2031 machinery, a rise in leakage current indicates _____ 漏电多表示绝缘不良。

A. good insulation B. bad insulation C. high insulation power factor D. a high slot discharge factor2031The purpose of a main switchboard circuit breaker's reverse-power trip is to 2032 _____主配电板电路切断器的逆功率跳闸设备用来防止发电机用作马达 A. prevent main circuit overload B. protect the circuit breaker blowout coil C. prevent alternator motorization D. prevent low voltage tripout2032 A signal derived from a controlled function and returned to the initiating point is called a/an ___来自于被控制单元、返回到起始点的信号，即是反馈信号。

A. monitoring signal B. inverse signal C. reverse signal D. feedback signal 2030 B 2031 C 2032 D 2033 The sub-multiple prefix "micro" means ___前缀“micro-”表示百万分之一(10) A. thousandth (10 to the -3rd power) B. millionth (10 to the -6th power) C. billionth (10 to the -9th power) D. trillionth (10 to the - 12th power) 2034 A semiconductor is a material with a ___半导体的导电性能比绝缘体好 A. conductivity higher than a normal conductor B. conductivity higher than a normal insulator C. high conductivity at low temperatures D. low conductivity at high temperatures2035The part of the shipboard electrical system used to control the distribution of 2036 power to the branch circuits, is the ____船舶电力系统中用于电能分配的设备是主配电板。

A. bridge control panel B. disconnect links C. governor relay box D. main switchboard2036 A switchboard for an AC electrical system requires the use of which of the following devices _____交流系统的配电板需要频率表 A. Frequency meter B. Ohmmeter C. Induction voltage regulator D. Current transformer governor 2033 B 2034 B 2035 D 2036 A2037 The resistance of a conductor varies ____导线的电阻与其长度成正比、与横截面积成反比 A. directly as its length and inversely as its cross-sectional area B. inversely as its length and directly as its cross-sectional area C. directly as its length and directly as its cross-sectional area D. inversely as its length and inversely as its cross-sectional area2038Possible phase relationships between voltage and current in an alternating 2039 current circuit include which of the following conditions.?交流电路中，电压与电流之间的相位关系可能是两者同相、电流超前电压、电流滞后电压。

A. Current and voltage may be in phase. B. Current may lead the voltage. C. Current may lag the voltage. D. All of the above. 2039 The sub-multiple prefix "nano" (n) means ___前缀“nano-”表示10亿分之一(10—9) A. thousandth (10 to the -3rd power) B. millionth ( 10 to the - 6th power) C. billionth (10 to the - 9th power) D. trillionth (10 to the - 12th power 2037 A 2038 D 2039 C2040A switchboard, for a AC electrical distribution system, will be provided with 2041 which of the following components ____2042 交流系统的配电板需要频率表、电流表和电压表等。

2043 A. Frequency meter B. Ammeter C. Voltmeter D. All of the above 2041 Which of the electrical properties listed will always be the same for each component in a parallel circuit?在并联电路中，电压是恒定的 A. Impedance B. Current C. Resistance D. Voltage 2042 A generator is prevented from becoming motorized by the use of a/an _____ A. over-speed trip B. reverse power relay C. back pressure trip D. governor controls 主配电板电路切断器的逆功率跳闸设备用来防止发电机用作电动机。

2043 Aboard ship, a grounded field coil in an AC motor can be determined using a _____在船舶上，交流电动机励磁线圈接地可通过使用兆欧表(迈格表)来判断 A. portable growler B. galvanometer C. visual inspection D. megohmmeter2044 Grease coatings on electrical contact surfaces increasecontact resistance and should be removed with a/an电气触点上的油脂层会增加接触电阻，应该使用干净的干布清除 A. small wire brush B. compressed air jet C. clean dry cloth D. 10% solution carbon solvent and water 2040 D 2041 D 2042 B 2043 D 2044 C  2045 A ground in an electrical circuit outside the engine room _____ 机舱外电路接地可通过主配电板上的接地检测灯来显示。

机舱外电路接地可通过主配电板上的接地检测灯来显示 A. cannot be detected under normal conditions B. is of no consequence to engineering personnel C. is indicated at the branch circuit breaker panel D. is indicated by the ground detecting lamps on the main swite~ 2046 Which of the following statements concerning a simple parallel resistance circuit is correct?在并联电路中，通过每个电阻的电压降是恒定的在并联电路中，通过每个电阻的电压降是恒定的 A. The voltage drop across each resistor is the same. B. The total current flow equals the reciprocal of the stun of the individual currents. C. The total resistance equals the sum of the individual resistances. D. The total voltage equals the sum of the individual voltages across each resistance. 2047 Which of the listed items will stop a motor due to a reduction in voltage and restart it when the voltage is restored to normal?低电压释放电路能使电机在电压下降时停低电压释放电路能使电机在电压下降时停转，当电压恢复正常时重新启动。

转，当电压恢复正常时重新启动 A. Low voltage protection circuit. B. Non-renewable link fuse. C. Renewable link fuse. D. Low voltage release circuit. 2045 D 2046 A 2047 D 2048Which of the following statements is true concerning simple parallel 2049 resistance circuits?在并联电路中，总电流等于各分支电流之和在并联电路中，总电流等于各分支电流之和2050 A. The total current flow equals the sum of the individual currents.2051 B. The total current flow equals the reciprocal of the sum of the individual currents.2052 C. The total resistance equals the sum of the individual resistance.2053 D. The total voltage equals the sum of the individual voltages across each resistance.20542049 The pushbutton on the handset of a ship's sound-powered telephone must be depressed to _____船舶上使用的声控船舶上使用的声控 机听筒上的按钮应按住，才能正常使机听筒上的按钮应按住，才能正常使用用(既能说又能听既能说又能听)。

A. talk then released to listen B. listen then released to talk C. both talk and listen D. ring the station being called20552050 The frequency of an alternator at a given RPM is determined by the2056 在给定的转速下，交流发电机的频率是由磁极的数目来决定的在给定的转速下，交流发电机的频率是由磁极的数目来决定的2057 A. number of turns of wire in the armature coil D. governor controls2058 B. number of magnetic poles C. strength of the magnets used2059 D. output voltage2060 2048 A 2049 C 2050 B2051 In a three-phase circuit, the phase voltages are ____在三相电路中，电压的相位差是在三相电路中，电压的相位差是120° A. 120 apart B 160 apart C. 180 apart D. 360 apart2052 The division of the kilowatt load between two AC generators operating in parallel is controlled by the settings and characteristics of the并联运行的发电机之间功率负荷的分配是由原动机调并联运行的发电机之间功率负荷的分配是由原动机调速器的设定和特性来控制的。

速器的设定和特性来控制的 A. voltage regulators B. field rheostats C. reverse power relays D. prime mover governors2053 The division of kilowatt load between two paralleled alternators is determined by the _____ 并联运行的发电机之间功率负荷的分配是由原动机调速器的负荷一速度特性来实并联运行的发电机之间功率负荷的分配是由原动机调速器的负荷一速度特性来实 现的 A. amount of field excitation of the leading machine B. load-speed characteristics of the governors C. amount of field excitation to the lagging machine D. type of alternator2054 In a simple series circuit, the entire source voltage will drop across _____ 在一个简单的串联电路中，总电源电压是在电路开环时表现出来的；而电流则是在在一个简单的串联电路中，总电源电压是在电路开环时表现出来的；而电流则是在 闭环时表现出来的。

闭环时表现出来的 A. the resistor next to the negative terminal B. a short circuit C. the resistor next to the positive terminal D. an open circuit2055The most inefficient method of voltage reduction from the stand point of power loss, is a/an 2056 _____从功率损失的角度看，将电阻与负载串联，电压降低的效率最低从功率损失的角度看，将电阻与负载串联，电压降低的效率最低 A. capacitor in series with the load B. inductor in series with the load C. capacitor and inductor in series with the load D. resistor in series with the load 2051 A 2052 D 2053 B 2054 D 2055 D2056 Which is a function of the voltage regulators used with AC generators?交流发电机中的电压调节器的作用是把并联运行发电机之间的相互作用的电流分 开。

A. To cut out generators when they are no longer required. B. To cut in additional generators automatically as required. C. To divide the KW load equally between generators operating in parallel. D. To divide reactive current between generators operating in parallel.2057For practical pm'poses, in a simple series circuit, the source voltage will be dropped 2058 across one resistor if it has ___在一个简单的串联电路中，总源电压可以认在一个简单的串联电路中，总源电压可以认为是在一个电阻上降压，如果该电阻大为是在一个电阻上降压，如果该电阻大 小是另一电阻的小是另一电阻的10倍以上。

倍以上 A. half the resistance of the other resistor B. a resistance equal to the other C. at least ten times the resistance of the other D. a partial short circuit2058 If both the "high level" and "low level" alarms come on for the same address of a centralized control console, the most likely problem is a/an _____ 如果中央控制站同一位置同时产生高位、低位报警，最有可能是传感器故障A. sensor failure B. failed alarm C. low level D. extremely high level2059 The instantaneous reduction in voltage of an AC generator, resulting from an increase in load, and prior to the automatic voltage regulator correcting the situation, is called voltage _____由于负荷的增加，交流发电机的电压瞬时下降，在自动电压调节器由于负荷的增加，交流发电机的电压瞬时下降，在自动电压调节器作用前，该瞬时电压降称为作用前，该瞬时电压降称为“电压扰动电压扰动”。

A. droop B. drop C. dip D. regulation 2056 D 2057 C 2058 A 2059 C 2060 An ohmmeter can be used to measure____欧姆表能用来测量电流的持续性能欧姆表能用来测量电流的持续性能(电路电路中的电阻大小中的电阻大小) A. current flow in a circuit B. voltage between two points in a circuit C. circuit continuity D. power2061When placed in a magnetic field, which of the materials listed will maintain the highest 2062 permeability?在这4种材料中，软铁的导磁率最大 A. Glass B. Bakelite C. Soft iron D. Aluminum 2062 A transformer in an electric circuit serves to____电路中变压器用来根据要求增加或电路中变压器用来根据要求增加或减少电路的电压。

减少电路的电压 A. generate its own electrical power B. transform electrical energy into mechanical energy C. increase or decrease circuit voltage as required D. convert AC current to DC current 2063 The main purpose of an electric space heater installed in a large AC generator is to_____大型交流发电机安装电加热器，其目的是为了防止停车时水气圈上大型交流发电机安装电加热器，其目的是为了防止停车时水气圈上凝结 A. prevent the windings from becoming brittle B. prevent moisture from condensing in the windings during shutdown C. prevent acidic pitting of the slip rings D. keep the lube oil warm for quick starting 2060 C 2061 C 2062 C 2063 B  2064 Prior to starting an AC generator prime mover, the voltage regulator cutout switch should be placed in the _____在启动交流发电机原动机之前，电压调节器的切断开关应置于手动操作位在启动交流发电机原动机之前，电压调节器的切断开关应置于手动操作位置。

置 A. manual position B. bus neutral position C. raise voltage position D. transfer position2065 When securing an AC generator, you should FIRST ____交流发电机停车前，应首先降低其交流发电机停车前，应首先降低其负荷 A. open the generator circuit breaker B. switch the voltage regulator to "manual" C. decrease the field excitation to minimum D. reduce the load on the unit2066When the current flow through a copper wire increases, its _____2067 当通过铜线的电流增加时，温度将升高当通过铜线的电流增加时，温度将升高 A. resistance will decrease B. insulation will bum C. temperature will increase D. conductivity will increase 2067 The frequency of an AC generator is adjusted by means of the _____ 交流发电机的频率是通过原动机调速器来调节的。

交流发电机的频率是通过原动机调速器来调节的 A. main alternator field rheostat B. exciter field rheostat C. prime mover governor control D. equalizing reactor 2068 When measuring AC current flow, you must always connect the meter _____ 当测量交流电流时，电流表应与电源、负载串联当测量交流电流时，电流表应与电源、负载串联 A. in series with the power source and load B. in parallel with the power source and load C. insuring correct polarity D. using the lowest range possible to prevent instrument damage 2064 A 2065 D 2066 C 2067 C 2068 A 2069 To increase the frequency of an operating AC generator, you should _____ 要增加交流发电机的频率，应增大原动机的速度。

要增加交流发电机的频率，应增大原动机的速度 A. increase the field excitation B. decrease the field excitation C. increase the number of magnetic poles D. increase the speed of the prime mover 2070 AC and DC generators are similar in that they ____ 交流发电机与直流发电机都能产生变化的电压交流发电机与直流发电机都能产生变化的电压 A. both generate alternating voltages B. both rectify the voltage before delivery C. are constructed at the same physical size for the same kilowatt rating D. both supply three-phase power 2071 If the length of a wire is halved and the cross-sectional area is doubled, the resistance will be _____如果电线的长度减半，横截面增大一倍，电阻将是原来的如果电线的长度减半，横截面增大一倍，电阻将是原来的1／／4。

A. quartered B. unchanged C. doubled D. quadrupled 2072 Which of the following devices are protected from being motorized by a reverse-power relay7 主配电板电路切断器的逆功率继电器用来防止发电机用作电动机主配电板电路切断器的逆功率继电器用来防止发电机用作电动机 A. Alternators B. Wave guides C. Exciters D. Amplidynes 2073 An advantage of DC motors over AC motors is that they与交流电动机相比，直流电动机的优与交流电动机相比，直流电动机的优点是控制转速有更有效的方法点是控制转速有更有效的方法 A. are less expensive B. require less maintenance C. can be started across the line D. offer a more effective means of controlling speed 2069 D 2070 A 2071 A 2072 A 2073 D2074 To equalize the power factor of two alternators operating in parallel, the _____ 为了平衡两台并联运行交流发电机的功率因数，两台发电机的励磁都应调行。

为了平衡两台并联运行交流发电机的功率因数，两台发电机的励磁都应调行 A. field excitation of both units is adjusted B. governors of both units are adjusted C. phase sequence is altered D. kilowatt load is evenly divided2075 Equal power factors on paralleled AC generators are maintained by an automatic ____保持并联运行交流发电机的功率因数相等，是通过自动电压调保持并联运行交流发电机的功率因数相等，是通过自动电压调节器来实现的节器来实现的 A. voltage regulator B. reverse power relay C. reverse current relay D. governor control switch2076If the resistance of a circuit is cut in half and the applied voltage is kept constant, the current flow will be ____ 如果电路的电阻减半，电压保持恒定，如果电路的电阻减半，电压保持恒定，电流将增大一倍。

电流将增大一倍 A. doubled B. quadrupled C. unchanged D. cut in half2077 The power factor at which a paralleled AC generator operates is usually adjusted by the ____并联运行交流发电机的功率因数一般是通过励磁来调节的并联运行交流发电机的功率因数一般是通过励磁来调节的 A. connected load B. prime mover speed C. field excitation D. generator's rated voltage 2074 A 2075 A 2076 A 2077 C2078 The primary function of an electric motor is to _____ 电动饥的基本功能是州来产生转矩电动饥的基本功能是州来产生转矩。

A. develop torque B. generate high voltages C, produce a magnetic field D. generate high electrical resistance2079 Current measuring instruments must always be connected in _____ 电流测量仪表应始终串接电流测量仪表应始终串接 A. series with a circuit B. parallel with a circuit C. series-parallel with a circuit D. delta with the shunt2080 The total power consumed in a parallel circuit is _____ 并联电路消耗的总功率应是各电阻上消耗功率之和该题正确答案应为并联电路消耗的总功率应是各电阻上消耗功率之和该题正确答案应为A。

A. the sum of the powers used in each load (resistor) B. divided by the number of loads C, always less than the power used in the smallest load D. the sum of the powers used in each individual load never more than the power ,used in the largest load2081 The resistance of electric wire will decrease as its _____ 电线的电阻将随其横截面的增力口两减少电线的电阻将随其横截面的增力口两减少 A. length increases B. cross-sectional area increases C. temperature increases D. percent of metallic purities increases 2078 A 2079 A 2080 C 2081 B 2082 The power factor of an AC generator operating singularly is determined by the _____单独运行的交流发电机（的功率因数）由负载的特性来决定的。

单独运行的交流发电机（的功率因数）由负载的特性来决定的 A. connected load B, prime mover speed C. field excitation D. generator's rated voltage2083When the voltage remains constant and the resistance is increased in a series circuit, the flow of current ___在串联电路中，如果电压保持恒定，电阻增加，在串联电路中，如果电压保持恒定，电阻增加，电流将减少电流将减少 A. increases by the square of the original value B. increases C. remains the same D. decreases2084 An ammeter should be used to measure ____安培表用来测量电流。

安培表用来测量电流 A. the voltage between two points in a circuit B. circuit continuity C. current flow in a circuit D. total or partial circuit resistance2085 Why is it desirable to operate paralleled AC generators at the same power factor?为了使循环电流保持最小，两台并联运行交流发电机的功率因数应保持相等为了使循环电流保持最小，两台并联运行交流发电机的功率因数应保持相等 A. Circulating currents are kept to a minimum. B. Field excitation losses are kept to a minimum. C. Generator rotors will have a lesser tendency to hunt. D. Because a power factor increase will decrease kilowatt output. 2082 A 2083 D 2084 C 2085 A 2086An operational amplifier, as used in today's consoles, may have a calculated gain of 52087 . This means that as the input changes by _____如果放大器的放大系数是如果放大器的放大系数是5，那么如果输入，那么如果输入量变化量变化1V，，则输出量变化则输出量变化5v A. 1 volt, the output changes 5 volts B. 5 volts, the output changes 1 volt C. 5 volts, the output changes 10 volts D. 10 volts, the output changes 5 volts2087 When the current in a power transmission line is increased, the power loss _____ 如果电流增加，则消耗功率将按电流的平方而增大。

如果电流增加，则消耗功率将按电流的平方而增大 A. increases as the square of the current B. decreases as the square root of the current C. remains the same, as it is independent of current flow D. increases in direct proportion as the current2088 Which of the listed sections of an emergency switchboard is used to supply power for alarm signals under emergency conditions?在应急配电板中，用于应急信号的电源是在应急配电板中，用于应急信号的电源是24V直流电 A. The generator and bus transfer section. B. The 450 volt, 60 cycle, 3 phase bus. C. The 120 volt, 3 phase, 60 cycle bus. D. The 24 volt DC bus. 2089 The operator of electrical motors should keep a constant check on the loads they carry because _____电机的操作员应连续检查其承受的负荷，因为超负荷运行将缩短其使用寿命。

电机的操作员应连续检查其承受的负荷，因为超负荷运行将缩短其使用寿命 A. low loads necessitate frequent insulation cleaning B. exceeding nameplate values shortens useful life C. energy is wasted if full loading is not utilized D. power factor correction methods are load dependent 2086 A 2087 A 2088 D 2089 B2090 Inductance is the property of an electric circuit that _____ 电感性负载将使电流滞后于电压，即引起电流变化受阻电感性负载将使电流滞后于电压，即引起电流变化受阻 A. opposes any change in the applied voltage B. opposes any change in the current flow through the circuit C. aids any changes in the applied voltage D. aids any changes in the current through the circuit2091 Capacitance is the property of an electric circuit opposing a change in the _____ 电容性负载将使电压滞后于电流，即引起电压变化受阻。

电容性负载将使电压滞后于电流，即引起电压变化受阻 A. current in the circuit B. voltage in the circuit C. inductance in the circuit D. resistance in the circuit2092 The frequency of an AC generator is controlled by the _____ 交流发电机的频率是由调速器来控制的交流发电机的频率是由调速器来控制的 A. rheostat B. governor C. exciter D. capacitor2093The frequency of an alternator is controlled from the main switchboard by adjusting the2094 _____交流发电机的频率是由主配电板通过调节调速器的控制来凋节的交流发电机的频率是由主配电板通过调节调速器的控制来凋节的。

A. frequency meter B. voltage regulator C. governor control D. sychroscope switch2094 Complete maintenance of electrical motors should include periodic checks for machine _____ 电动马达的维护应包括周期性地检查其振动情况电动马达的维护应包括周期性地检查其振动情况 A. vibration B. watertight integrity C. speed droop D. reactive power2095 The number of cycles per second occurring in AC voltage is known as the _____ 交流电压每秒的循环数．即所谓的交流电压每秒的循环数．即所谓的“频率频率” A. phase angle B. frequency C. wave form D. half mode 2090 B 2091 B 2092 B 2093 C 2094 A 2095 B2096 Voltage will always lead current in a/an _____ 电感性负载将使电流滞后于电压，即电压超前电流，电感性负载将使电流滞后于电压，即电压超前电流， A. capacitive circuit B. inductive circuit C. magnetic circuit D. resistive circuit2097 The need for insulation cleaning may be determined by _____ 绝缘层是否需要清洁可通过观察赃物积聚情况来决定绝缘层是否需要清洁可通过观察赃物积聚情况来决定? A. visual inspection for dirt accumulation B. high megger readings C. low operating temperature D. the time period since the last cleaning2098You are attempting to parallel two AC generators and the synchroscope pointer is revolving in2099 the slow direction. This indicates that the frequency of the incoming machine is _____ 发电机并车时．如果同步指示仪在慢速方向回转，则表明待并机的频率比电网频率低。

发电机并车时．如果同步指示仪在慢速方向回转，则表明待并机的频率比电网频率低 A. higher than the bus frequency B. lower than the bus frequency C. the same as the bus frequency but out of phase with it D. the same as the bus frequency, and the circuit breaker may be closed at any pointer position2099 Ambient temperature is the ____电动机的环境温度是指安装电动帆的舱室之温度电动机的环境温度是指安装电动帆的舱室之温度A. amount of temperature rise with no load B. temperature of the compartment where the motor is located C. nomml operating temperature, less the room temperature D. amount of temperature developed by an operating motor2100 Electric circuits are protected against overloads and short circuits by means of a/an _____ 电路使用断路器，可防止电路超负荷和短路。

电路使用断路器，可防止电路超负荷和短路 A. circuit breaker B. amplifier C. diode D. capacitor 2096 B 2097 A 2098 B 2099 B 2100 A2101While paralleling two (2) AC generators using synchronizing lamps only, both lamps 2102 will go dark when the generators are ____发电机并车时，当发电机处于同相时，同步指发电机并车时，当发电机处于同相时，同步指示灯均变暗示灯均变暗 A. running at the same speed B. grounded C. of the same polarity D. in phase2102When voltage and current developed in an AC circuit reach their peak values at the same time, the power factor is ____交流电路中，电压与电流同时达到最大值，则功率因数为交流电路中，电压与电流同时达到最大值，则功率因数为1(最大最大)。

A. lagging B. leading C. maximum D. minimum2103Moisture absorbed in the windings or condensed on the surface of electrical machinery insulation _____2104电气设备绝缘层吸收的水分将降低绝缘电阻，对于闲置的设备将引起接地故障电气设备绝缘层吸收的水分将降低绝缘电阻，对于闲置的设备将引起接地故障2105 A. is good for long term preserving since most insulation is organic and contains some amount B. lowers the insulation value and is a common cause of fault grounds in idle machines C. will enhance insulation resistance only if it is fresh water and contains no salt D. reduces the amount of current supplied or drawn by the machine so horsepower is limited2104 The voltage developed by an AC generator is controlled by varying the_____ 交流发电机产生的电压是通过改变直流励磁来控制的。

交流发电机产生的电压是通过改变直流励磁来控制的 A. speed of the prime mover B. AC excitation to the field C. DC excitation to the field D. DC excitation of the voltage regulator 2101 D 2102 C 2103 B 2104 C2105You are attempting to parallel two AC generators, and the synchroscope 2106 pointer is revolving in the fast direction. This indicates that the frequency of the incoming machine is _____ 发电机并车时，如果同步指示仪在快速方向回转，则表明待并机的频率比电网频发电机并车时，如果同步指示仪在快速方向回转，则表明待并机的频率比电网频率高。

率高 A. higher than the bus frequency B. lower than the bus frequency C. the same as the bus frequency but out of phase with it D. the same as the bus frequency and the circuit breaker may be closed at any pointer position2106 AC voltmeters are generally calibrated to read the _____ 交流电压表的读数是电压的均方根值交流电压表的读数是电压的均方根值 A. instantaneous voltage B. average voltage C. RMS voltage D. peak voltage2107 When two AC generators are being ,paralleled, the breaker should be closed with the synchroscope pointer rotating in the _____发电机并车操作时．应在同步发电机并车操作时．应在同步指示仪在快速方向回转，指针正好在指示仪在快速方向回转，指针正好在“12点点”之前合闸。

之前合闸 A. " slow " direction, just before the 12 o clock position B. "fast" direction, just after the 12 o'clock position C. "fast" direction, just before the 12 o'clock position D. "slow" direction, just after the 12 o'clock position 2105 A 2106 C 2107 C 2108When paralleling two AC generators, the frequency of the machine coming on-line, 2109 immediately prior to closing its breaker, should be _____ 发电机并车操作时，在合闸之前的一刹那，待并机的频率应比电网频稍高一些发电机并车操作时，在合闸之前的一刹那，待并机的频率应比电网频稍高一些。

A. slightly less than the oncoming generator frequency B. the same as the bus frequency C. slightly greater than the bus frequency D. the same as the bus voltage2109 The unit “hertz” is equivalent to ____每秒的循环数，即所谓的每秒的循环数，即所谓的“频率频率” A. coulombs per second B. revolutions per second C. revolutions per minute D. cycles per second21 l0 A DC generator is used to supply direct current in order to maintain an AC generator field and is known as a/an ___用来维持交流发电机磁场的直流发电机，用来维持交流发电机磁场的直流发电机，称作称作“励磁机励磁机”。

A. rotor B. stator C. exciter D. armature2111 When paralleled, AC generators must have the same _____ 并联运行的交流发电机应具有相同的频率、相同的相和同样的相旋转速度并联运行的交流发电机应具有相同的频率、相同的相和同样的相旋转速度 A. frequency B. number of phases C. phase rotation D. All of the above 2108 C 2109 D 2110 C 2111 D 2112 To protect the rotor of a motor disassembled for maintenance or overhaul, it should be 电机拆卸后，转子应使用厚纸或纸板包扎电机拆卸后，转子应使用厚纸或纸板包扎 A. suspended by wire slings in one comer of the shop _____ B. wrapped in several layers of heavy paper or c~ C. supported by flat wood blocks on the workbench D. returned to the frame as soon as the beatings are removed2113 Which of the following materials is a good insulator.?玻璃是一种良好的绝缘体。

玻璃是一种良好的绝缘体 A. steel B. aluminum C. glass D. copper2114 Electrical power is expressed in _____电功率用瓦特表示电功率用瓦特表示 A. ohms B. volts C. amps D. watts2115Which of the following should be the FIRST step in removing a generator from parallel 2116 operation? 要使并联运行的一台发电机停车，应首先使其卸载要使并联运行的一台发电机停车，应首先使其卸载 A. Trip the generator off the switchboard. B. Turn off all electrical equipment. C. Remove the load from the "off going"generator. D. Increase the cycles of the generator staying on the line.2116 Prior to closing the breaker when paralleling two AC generators, the recommended practice is to have the frequency of the incoming machine _____发电机并车操作时，待并机的频率应比发电机并车操作时，待并机的频率应比电网频率稍高一些。

电网频率稍高一些 A. slightly less than the line frequency B. the same as the line frequency C. slightly greater than the line frequency D. All of the above 2112 B 2113 C 2114 D 2115 C 2116 C2117Accidental grounds in a shipboard electrical system m~st be repaired as2118 soon as possible as they will ____船舶电力系统接地，应尽早排除，因为接地船舶电力系统接地，应尽早排除，因为接地会损坏绝缘层、缩短寿命会损坏绝缘层、缩短寿命 A. result in immediate power outages B. damage circuit breaker C. appear on the ground detection system D. damage insulation and may cause outages2118 Current flowing in only one direction is called _____ 只以一个方向流动的电流，称为直流电。

只以一个方向流动的电流，称为直流电 A. alternating current B. omnidirectional current C. direct current D. sinusoidal current 2119 An alternator is being paralleled with one on the line. At the INSTANT the circuit breaker is closed, the frequency of the incoming alternator will normally _____ 发电机并车操作时，在合闸之前的一刹那，待并机的频率将会下降一些发电机并车操作时，在合闸之前的一刹那，待并机的频率将会下降一些 A. increase B. not change C. decrease D. be exactly 60 hertz 2120 In an alternating current electrical system, a low system power factor is a direct sign of _____在交流电力系统中，功率因数低，表明能量损耗多。

在交流电力系统中，功率因数低，表明能量损耗多 A. wasted energy B. efficient operation C. a short in the exciter field windings D. an excessive number of minor system grounds 2117 D 2118 C 2119 C 2120 A 2121 The unit of electrical power is the _____电功率用瓦特表示电功率用瓦特表示 A. ampere B. kilovolt C. watt D. farad 2122 If a small electric motor is immersed in salt water it should be _____ ①① washed in fresh water; ②② dried in an oven 如果小型电动机浸在海水中，应用淡水洗并烘干。

如果小型电动机浸在海水中，应用淡水洗并烘干 A. ①① only B. ②② only C. both ①① and ②② D. neither①① or ②② 2123 In order to change the direction of rotation of a D.C. motor _____ ①① the field leads must be changed; ②② the input leads must be changed 为了改变直流电动机的回转方向，只需改变磁场接线即可为了改变直流电动机的回转方向，只需改变磁场接线即可 A. ①① only B. ②② only C. either①① or ②② D. both ①① and ②② 2124Some large A.C. motors are equipped with heaters. These could be 2125 _____ ①① resistance heaters bolted directly to the frame ; ②② low voltage windings embedded in the motor windings一些大型的电动机装有加热器。

加热器可以是直接与机架连接的电阻式加热器，也一些大型的电动机装有加热器加热器可以是直接与机架连接的电阻式加热器，也可以是嵌在电机线圈内的低电压线圈可以是嵌在电机线圈内的低电压线圈 A. ①① only B. ②② only C. either ①① or ②② D. neither ①① and ②② 2125The unit of electrical resistance is the _____电阻的单位是欧姆电阻的单位是欧姆2126 A. ampere B. volt C. watt D. ohm2127 2121 C 2122 C 2123 A 2124 C 2125 D2126 If a DC motor runs hot, the cause may be ____如果直流电机运行时过热，原因如果直流电机运行时过热，原因可能是通风管堵塞可能是通风管堵塞 A. high mica condition B. low ambient temperature C. clogged ventilation ducts D. an open in the shunt field2127 Sparking at the brushes of a running motor could be an indication of _____电机电机运行时，电刷冒火星，可能是换向器脏了。

运行时，电刷冒火星，可能是换向器脏了 A. normal operation B. a dirty commutator C. increased brush capacity D. water vapor absorption2128A three-phase alternator operates at 450 volts with a power factor of 0.8. 2129 If the ammeter indicates 250 amperes, what should be the KW meter reading _____2130 千瓦表读数千瓦表读数=31/2fVL=1．．732X0．．8X480X250=155．．70(kW) A. 90.00 kW B. 127.27 kW C. 155.70 kW D. 194.85 kW2129Electrical failures in motors are caused by the breakdown of insulation, which may be caused by ____2130 水气渗入、脏物积聚和过热都会引起绝缘材料损坏。

水气渗入、脏物积聚和过热都会引起绝缘材料损坏 A. penetration of moisture B. accumulation of dirt C. overheating D. All of the above. 2126 C 2127 B 2128 C 2129 D2130An operational amplifier, as used in today's consoles, has a calculated gain 2131 of 5. This means that when the input changes _____ 如果放大器的放大系数是如果放大器的放大系数是5，那么如果输人量变化，那么如果输人量变化2V，，则输出量变化则输出量变化1Ov.A. 5 volts, the output changes 10 volts B. 10 volts, the output changes 5 voltsC. 2 volts, the output changes 10 volts D. 10 volts, the output changes 2 volts2131 Universal motors will operate on AC or DC current, and are generally found in _____手动工具一般使用交、直流两用电动机。

手动工具一般使用交、直流两用电动机 A. portable tools B. large pump motors C. turbo electric main motors D. forced draft fans2132 A motor enclosure which protects against falling liquids is classified as _____能防能防止液体滴落的电动机外罩，称为防滴水式电动机；止液体滴落的电动机外罩，称为防滴水式电动机； A. waterproof B. drip proof C. spray tight D. spray proof2133 A diesel driven emergency generator is prevented from being paralleled with the ship's service generators by _____ 一般采用电气联锁系统来防止柴油机驱动的应急发电机与普通船用发电机并联运行一般采用电气联锁系统来防止柴油机驱动的应急发电机与普通船用发电机并联运行。

A. an electrical interlock system B. an automatic paralleling trip switch C. the synchronizing oscilloscope D. the reverse current relay 2130 C 2131 A 2132 B 2133 A2134 The energy consumed by an AC motor, as strictly reactive power, is _____ 交流电动机消耗的能量，严格地说，即相互作用的功率，用于产生电动机的磁场交流电动机消耗的能量，严格地说，即相互作用的功率，用于产生电动机的磁场 A. used to do mechanical work B. used to establish the magnetic field of the motor C. lost as heat generated by the windings D. lost in doing work to turn the motor itself2135A vessel is equipped with two ship's service generators. Generator # 1 is rated at 900 kW and generator # 2 is rated at 600 kW. During parallel operation, with a hotel load of 1,000 kW, what should be the kW load on generator # 2 _____ 1号发电机额定功率是号发电机额定功率是900kW，，2号发电机额定功率是号发电机额定功率是600kW；；并联运行时；如果总负荷是１并联运行时；如果总负荷是１000kW，，则则2号发电机按比例得到的负荷将是号发电机按比例得到的负荷将是2／／5的总负荷，即的总负荷，即400kW，， A. 100 kW B. 400 kW C. 500 kW D. 600 kW2136 An alternator switchboard has a synchroscope and synchronizing lamps. If the synchroscope is broken, which of the steps listed is the most essential before an alternator can be paralleled with the bus _____ 发电机并车操作时，如果同步指示仪损坏了，应使用频率表来判断待并机的频率应发电机并车操作时，如果同步指示仪损坏了，应使用频率表来判断待并机的频率应 比电网频率稍高一些。

比电网频率稍高一些 A. The breaker should be closed when one synchronizing lamp is dark and the other is bright. B. The breaker should be closed when both synchronizing lamps are bright. C. The frequency meter should be used to determine that the incoming alternator frequency is slightly higher than the bus. D. A portable phase sequence indicator must be used to verify the information from the lamps. 2134 B 2135 B 2136 C2137 The most common type of AC service generator found ~ ship is the stationary _____船用交流发电机的结构通常是电枢静止，磁场旋转。

船用交流发电机的结构通常是电枢静止，磁场旋转 A. electromagnetic field, revolving armature type B. electromagnetic field, oscillatory armature type C. armature, oscillatory electromagnet field type D. armature, rotating electromagnetic field type2138Which of the following statements represents the FIRST precaution to be taken prior to working on any installed electrical component _____ 对电气设备进行维修工作前，应首先切断电源并作告示对电气设备进行维修工作前，应首先切断电源并作告示 A. Wear rubber gloves and boots. B. Use only approved non-conducting tools. C. Ground the case of the machine before beginning any repairs. D. Open the supply circuits and tag the switches.2139 Before any work on electrical or electronic equipment is performed, which of the following precautions should be carried out _____见上题。

见上题 A. De-energize the applicable switchboard bus B. Bypass the interlocks C. Secure and tag the supply circuit breaker in the open position D. Station a man at the circuit supply switch 2137 D 2138 D 2139 C2140 An emergency generator, driven by an internal combustion engine, shall be tested under load for a minimum of 2 hours at least once every _____ 柴油机驱动的应急发电机，每月应进行至少柴油机驱动的应急发电机，每月应进行至少2h的负荷试验的负荷试验 A. week B. 2 weeks C. month D. 3 months2141When working on a high voltage circuit, you should always have another person present with you. This person should have a good working knowledge of _____进行高电压作业时，操作者应由另一人员陪伴。

该人进行高电压作业时，操作者应由另一人员陪伴该人员应清楚被检修的电路情况以及电路所有开关和断路器的位置；能进行电员应清楚被检修的电路情况以及电路所有开关和断路器的位置；能进行电击时的应急抢救；熟悉心脏起搏法击时的应急抢救；熟悉心脏起搏法(CPR，，一种心脏急救知识一种心脏急救知识)等 A. the circuit being worked on and the location of all switches and circuit breakers controlling it B. first-aid techniques for treating electrical shock C.cardiopulmonary resuscitation (CPR) D. All of the above 2142 When there is a fire in a large electric motor, normally the very FIRST step is to _____大型电动机着火，首先应切断电源大型电动机着火，首先应切断电源。

A. secure the electric supply B. ventilate area to remove smoke C. start the fire pump and lead out hose D. apply foam 2140 C 2141 D 2142 A2143 If a steering motor becomes overloaded, the _____ 如果舵机马达超负荷了，机舱将会有声光报警如果舵机马达超负荷了，机舱将会有声光报警 A. overload condition of 5 % will trip the motor off the line immediately B. overload condition will be indicated visually in the machinery space C. motor running indicator will begin to flash "on" and "off" in response to the sustained overload condition D. standby steering pump will start automatically and come on the line 2144 Generators should have an excitation/voltage regulation system which will enable them to share the steady state reactive load _____ no machine exceeds its proportional share of reactive load by more than 10% of the rated reactive load of the largest generator.发电机应该具有励磁／电压调节系统，该系统能使发电机分配到稳定状态的发电机应该具有励磁／电压调节系统，该系统能使发电机分配到稳定状态的反向负载，也就是要保证任一台发电机都不会超过其额定反向负载的反向负载，也就是要保证任一台发电机都不会超过其额定反向负载的10％。

％ A. when B. so as C. such that D. though 2143 B 2144 C2145Self-excited a.c. generator with "error operated" voltage control systems 2146 draw the full excitation power for the machine terminals. This dispenses with the current transformers, reactors and capacitors necessary for accurate compounding, but renders the excitation system vulnerable to variations in its output voltage. Which of the following is correct about the generator mentioned according to the sentences above _____ 2145．．带有偏差信号操作的电压控制系统的自激励交流发电机，把全部励磁功率都引到终带有偏差信号操作的电压控制系统的自激励交流发电机，把全部励磁功率都引到终 端。

端这样不需要采用电流变送器、电抗器、电容器等设备，但是这样的励磁系统易受其输出这样不需要采用电流变送器、电抗器、电容器等设备，但是这样的励磁系统易受其输出电压变化的影响电压变化的影响A. It consumes no excitation power . B. It has current transformers. C. Components are needed for accurate compounding. D. Its excitation system is vulnerable to voltage variations2146 _____ is a precaution which contributes to avoiding trouble under normal operating conditions.2146．．连续检查有助于避免正常运行状态下产生故障连续检查有助于避免正常运行状态下产生故障A. Constant inspection B. Keeping constant load C. Remaining constant temperature D. Varying speed2147 In the engine department, the _____ is looked upon to provide the leadership that is needed.2147，，轮机长是轮机部的领导。

轮机长是轮机部的领导 A. captain B. chief engineer C. chief officer D. chief motorman 2145 D 2146 A 2147 B2148During an engine room watch if immediate action is necessary to ensure 2149 safety of the ship, its machinery and crew _____ 2148．在轮机值班期间，为确保船舶、机械及人员的安全，应由值班轮机员采取迅速的行动A. the chief engineer must be informed at first B. the captain must be informed at first C. it must be taken by the duty engineer D. the generator engine must be stopped2149 At the beginning of the watch the current operational parameters and the condition of all machinery should be verified and also the log readings should correspond with those _____ 2149．在值班开始的时候，所有机械的运行参数和工作状况都应证实，记录的数据应与观察到的相一致。

A. noted by the bridge officer B. told by last duty engineer C. observed D. in the instruction manual 2150 When under maneouvring conditions with the machinery being manually operated the control unit or console should be _____ 2150．当处在机动操纵工况时，机械处于人工操作状态，控制台应保持连续有人值班 A. automatically controlled B. continuously manned C. off power D. None of the above is true 2148 C 2149 C 2150 B 2151 Bridge orders must be _____ and a record of any required changes in speed and direction should be kept.2151．驾驶台的命令应迅速进行，并应保持任何变速、变向的记录。

A. slowly carried away B. ,carried out with a period of delay C. promptly carried out D. paid by the captain2152 Keep compartment _____ as the gas given off can be dangerous.2152．应保持舱室良好通风，因为释放的气体很危险A. well ventilated B. well clean C. in good order D. more room2153The company should establish procedures to ensure that the ship is 2154 maintained _____ the provisions of the relevant roles and regulations.2153．船公司应建立起一个程序，以确保船舶的保养符合有关规则和规定的要求。

A. out of accordance with B. in relation to C. in conformity with D. in connection with2154 The SMS should provide for specific measures aimed at promoting the _____ of equipment or systems the sudden operational failure of which may result in hazardous situations.2154．“安全管理体系”应明确那些应突发性操作失灵会导致险情的设备和系统，SMS应规定旨在提高这些设备或系统可靠性的具体措施 A. visibility B. ability C. reliability D. capability 2151 C 2152 A 2153 C 2154 C2155 Oil Record Book Part I shall be provided to _____ 2155．400总吨及以上的任何船舶应配备《油类记录簿》第一部分。

A. every oil tanker B. every ship of 400 tons gross tonnage and above C. A and B D. neither A nor B2156 The requirements of the ISM Code may be applied to _____ 2156．ISM规则的要求适用于任何船舶A. only oil tankers B. only passenger ships C. only containers D. all ships2157 The objectives of the ISM Code are to ensure _____ 2157．ISM规则的目的是保证海上安全，防止人员伤亡，避免财产损失和对环境特别是对海洋环境造成危害A. safety at sea B. prevention of human injury or loss of life C. avoidance of damage to the marine environment and to property D. All of the above.2158The purpose of the ISM Code is to provide _____ standard for the safe 2159 management and operation of ships and for pollution prevention.2158．ISM规则的目标是要为船舶安全管理和营运以及防污染提供一个国际性的标准。

A. a regional B. the best C. an international D. an ideal 2155 B 2156 D 2157 D 2158 C2159 ___means the Government of the State whose flag the ship is entitled to fly.2159．“主管机关”是指船旗国政府 A. Assembly B. Organization C. Company D. Administration2160In discussing oil pollution, one important fact to remember is that the 2161 problem remains the same _____ heavy _____ light oil is spilled into the water.2160．在讨论油污染时，重要的一点是，不管是轻油还是重油溢入水中，问题是一样的。

A. both/and B. whether/or C. neither/nor D. because/so2161 While loading bunkers, you notice oil on the water near the vessel. What should you do first _____ 2161．加油期间，发现船舶附近有油，首先应停止加油A. Stop loading B. Notify the harbour administration C. Determine if the vessel is the source of the pollution D. Start the main engine and put them in gear to disperse the spill2162 STCW shall apply to seafarers _____ on board seagoing ships entitled to fly the flag of a Party.2162。

STCW公约适用于在缔约国为船旗国的船舶上服务的船员 A. served B. serving C. surveyed D. surveying 2159 D 2160 B 2161 A 2162 B2163The basic training in fire prevention and fire fighting should include the2164 practical elements which should allow the trainees to acquire the ability to _____ 2163．防火与灭火的基本训练应包括：使用自带式呼吸面具、使用各种类型的手提式灭火器、带呼吸面具在烟雾室营救等实际技能 A. use self-contained breathing apparatus B. use various types of portable fire extinguishers C. effect a rescue in a smoke-filled space wearing breathing apparatus D. All of the above2164 The basic training in fire prevention and fire fighting should include the theoretical elements which should cover _____ 2164．防火与灭火的基本理论知识应包括：火灾和爆炸的三要素、爆炸上下限、火灾的种类和灭火介质的应用等。

A. the three elements of fire and explosion B. lower and upper flammable limits C. classification of fires and applicable extinguishing agents D. All of the above2165 The main causes of fire on board ships are _____ 2165．船舶火灾的主要原因有：机舱漏油、热工作业、静电等 A. oil leakage in engine-room B. hot work (welding, cutting, etc. ) C. static electricity D. All of the above 2163 D 2164 D 2165 D2166The fire-fighting practical training should take place in spaces which 2167 provide truly realistic training conditions, and whenever possible and practical should be carried out in _____ 2166．消防实训应在黑夜中或白天或模拟机舱等情况下进行。

A. darkness B. daylight C. simulated engine-room D. all of the above2167 Ship fire-fighting organization includes _____ 2167．船舶的消防组织应包括：一般报警和火灾控制计划；应急部署表及各自职责；巡视制度等A. general alarm and fire control plans B. muster stations and duties of individuals C. patrol system D. All of the above2168 Safety-management objectives of the Company should establish safeguards all _____ identified risks.2168．公司的安全管理目标是针对已认定的所有风险，制定防范措施A. with B. without C. against D. above2169The results of the audits and reviews _____ to the attention of all personnel having responsibility in the area involved.2169。

应将评审及复查的结果告知有关部门的所有人员以提请他们注意 A. should bring B. should be brought C. should take D. should be taken 2166 D 2167 D 2168 C 2169 B2170The Company should ensure that the ship's personnel are able to _____ 2171 effectively in the execution of their duties related to the SMS.2170．公司应保证船上人员在履行其与SMS有关的职责时能有效地交流A. communicate B. verify C. audit D. evaluate2171 The Company should ensure that _____ involved in the Company's SMS have an adequate understanding of relevant rules, regulations, codes and guidelines.2171．公司应保证与公司有关的所有人员对有关规范、规则和指南有充分的了解。

A. masters B. chief engineers C. crew D. all personnel2172 The Company should ensure that the master is fully _____ with the Company's SMS. 2172．公司应保证船长完全熟悉公司的SMSA. familiar B. understand C. conversation D. confused2173 The requirements of the ISM Code may be applied to _____ 2173．ISM规则的要求适用于任何船舶 A. only oil tankers B. only passenger ships C. only containers D. all ships 2170 A 2171 D 2172 A 2173 D2174The purpose of the ISM Code is to provide _____ standard for the safe 2175 management and operation of ships and for pollution prevention. 2174．ISM规则的目标是要为船舶安全管理和营运以及防污染提供一个国际性的标准。

A. a regional B. the best C. an international D. an idem2175The Company should ensure that _____ documents are promptly removed.2175．公司应保证过期的文件应迅速清除 A. absolute B. updated C. outdated D. new2176 The SMS should provide for specific measures aimed at promoting the _____ of equipment or systems the sudden operational failure of which may result in hazardous situations.2176．“安全管理体系”应明确那些应突发性操作失灵会导致险情的设备和系统，SMS应规定旨在提高这些设备或系统可靠性的具体措施A. visibility B. ability C. reliability D. capability2177The SMS should provide for _____ ensuring that the Company's organization can respond at any time to hazards, accidents and emergency situation involving its ships.2177．SMS应规定具体措施，确保公司机构能在任何时候对涉及其船舶的危险、事故和紧急情况作出反应。

A. programs B. progress C. members D. measures 2174 C 2175 C 2176 C 2177 D2178Administrations should bear in mind the significance of _____ in maintaining safety of life and property at sea and in preventing marine pollution. 2178．主管机关应充分认识到通信和语言技能在保证海上人命、财产安全和防止海洋污染方面的重要意义 A. advanced nautical equipment B. advanced performance main engines C. emergency equipment D. communication and language skills2179 Oil Record Book Part I shall be provided to every oil tanker of 150 tons gross tonnage and above and every ship of 400 tons gross tonnage and above, _____ oil tankers, to record relevant machinery space operations.2179．MARPOL公约规定，150总吨及以上的油轮和400总吨及以上的非油轮应配备《油类记录簿》第一部分(有关机器处所的操作)。

A. as well as B. as 10ng as C. rather than D. other than2180 An oil in water monitor is required in order to measure _____ 2180．油分浓度，监测器用来监测水中的含油浓度 A. the oil content in water B. the water content in fuel oil C. the water level in bilge well D. the oil level in bilge well 2178 D 2179 D 2180 A 2181 A vessel is required to carry an Oil Record Book Part I to log entries in the book regarding the _____ 2181．对于“燃油舱的压载和清洗水的排放”，应记录到《油类记录簿》第一部分。

A. discharge of ballast or cleaning water from fuel tanks B. sounding levels of all fuel tanks on a daily basis C. grade and specific gravity of all fuel oil carried D. fuel consumption rates on a weekly basis 2182 A segregated ballast system is a system where _____ 2182．“专用压载系统”，就是所有的压载管路、水舱和水泵完全与燃油系统的独立A. all ballast is processed through the oily water separator B. ballast is taken on and discharged through a separate main deck riser C. ballast and cargo tanks are separated by cofferdams D. all ballast lines, tanks, and pumps are independent of those used for oil 2183 The abbreviation "GM" is used to represent the _____ 2183．GM表示“稳性高度”。

A. height of the metacenter B. fighting arm C. righting moment D. metacentric height 2181 A 2182 D 2183 D 2184Which of the following statements describes one of the functions of the 2185 ballast system? 2184．压载系统的功能是通过让某些指定的舱室进海水来保持船舶平衡A. To permit flooding of any fuel oil storage tank on any class of ship. B. To use it as a secondary service system. C. To store reserve feed or potable water for extended cruises. D. To stabilize the ship by flooding certain designed tanks with seawater.2185 The lowest temperature at which the vapor formed from a liquid ignites and continues to bum steadily in the presence of an ignition source is called the _____ 2185．在存在氧气酌情况下，由液体产生的蒸汽能点燃并能继续稳定燃烧的最低温度，称为“着火点”。

A. flash point B. fire point C. upper explosive limit D. lower explosive limit2186 The distance between the bottom of the hull and the waterline is called _____ A. tonnage B. reserve buoyancy C. draft D. freeboard2186．船体底部与水线之间的距离称为“吃水” 2184 D 2185 B 2186 C 2187Which of the following machinery space operations is required to be logged 2188 in the Oil Record Book? 2187有关“燃油舱的压载和清洗”，应记录到《油类记录簿》第一部分。

A. Ballasting or cleaning of fuel oil tanks. B. Shifting suction of main fuel pump to reserve fuel oil tank. C. Changing out sprayer plates to adjust for steam demand. D. Daily inspection of engine room bilges.2188For an upright vessel, draft is the vertical distance between the keel and the _____ 2188；对于处于正浮的船舶，船体龙骨与水线之间的距离称为“吃水” A. waterline B. freeboard deck C. Plimsoll mark D. amidships section2189 Which of the following operations aboard a tanker must be recorded in the Oil Record Book _____ 2189。

油轮上，货油的内部驳运、机舱舱底水的排放、货油的装载与卸载等操作都应记录到《油类记录簿》 A. Any internal transfer of oil cargo during a voyage B. The discharge overboard in port or at sea of any bilge water accumulated in machinery spaces C. The loading or unloading of any or all oil cargo D. All of the above 2187 A 2188 A 2189 D 2190 The Oil Record Book must be maintained o~ the vessel for _____ 2190们由类记录簿》用完后应至少留船保存3年A. not less than 3 years and be readily available for inspection B. 6 months and then submitted to the nearest Marine Safety Office for review C. an annual inspection D. the duration of the ship's active employment2191 The approval period for a shipboard oil pollution emergency plan expires after _____ 2191。

船舶油污应急计划”有效期为5年 A. one year B. two years C. four years D. five years2192 A fire is considered "under control"when _____ 2192，火灾已被包围并不再扩散，则可以说火灾处于“控制之下”A. all hands are at their fire stations B. all fire-fighting equipment is at the scene C. the fixed systems are activated D. the fire is contained and no longer spreading2193 A shipboard oil pollution emergency plan is required of _____ 2193．ＭＡRPOI公约规定，150总吨及以上的油轮和400总吨及以上的非油轮应配备“船舶油污应急计划” A. all vessels, regardless of size and commercial application B. any barge or other ship which is constructed or operated in such a manner that no oil in any form can be carried aboard C. an oil tanker of 150 gross tons or above, or other ship of 400 gross tons or above D. an oil tanker of 400 gross tons and above, or other ships of 150 gross tons and above 2190 A 2191 D 2192 D 2193 C2194When making entries in the Oil Record Book, the date, operational code, and item number shall be inserted in the appropriate columns. Furthermore, the required particulars shall be _____ 2195 2194．填写〈油类记录簿》时，日期、作业代码和项目编号记录到相应的表格内，所要求的细节应按年月J1匝序记人到空栏中。

2196A. recorded only for accidental oil discharges B. recorded only for operations involving discharge of oily waste C. signed by the oiler who enters them in the Oil Record Book D. recorded chronologically in the blank space2195 Each completed page of the Oil Record Book must be signed by the _____ 2195．《油类记录簿》每页记完后，应由船长签名A. engineer on watch B. Chief Engineer C. Chief Mate D. Master2196 To prevent the spread of fire by conduction, you should _____ 2196．为了防止火灾由于热传导而扩散，应冷却火灾周围的舱壁。

A. cool the bulkheads around the fire B. remove combustibles from direct exposure C. close all openings to the area D. shut off all electric power2197 The difference between the starboard and port drafts caused by a transverse shift in weight is _____ 2197．由于横倾，船舶左右吃水的差称为横向吃水差(list) A. list B. heel C. trim D. flotation 2194 D 2195 D 2196 A 2197 A2198 In the Oil Record Book, a comprehensive list of operational items are grouped into operational sections. Each section is codified by a/an _____ 2198．《油类记录簿》中，有关操作项目分成各个组，每个组由字母来表示。

如“A”，表示“燃油舱的压载与清洗” A. number B. abbreviation C. letter D. All of the above2199 Burning diesel oil should be treated as which class of fire?2199．火灾按如下分类：A类——固体；B类——液体和气体；C类——电气；D类——轻金属因此，柴油燃烧应按B类火处理 A. Class "A" B. Class "B" C. Class "C" D. Class "D"2200 If your vessel has a starboard list after taking on fuel, you would transfer2201 fuel _____ 2200、加装燃油后，船舶向右倾斜，应将油驳到左侧油舱以平衡船舶A. to starboard B. to port C. forward D. aft2201 Convection spreads a fire as a result of _____ 2201．火灾通过对流方式扩散，通常是由于高温气体通过通风系统流动。

A. transmitting the heat of a fire through the ship's metal B. burning liquids flowing into another space C. heated gases flowing through ventilation systems D. the transfer of heat across an unobstructed space 2198 C 2199 B 2200 B 2201 C2202Under the regulations implementing MARI~L, a mobile offshore drilling unit is 2203 required to have an International Oil Pollution Prevention (IOPP) certificate when the unit _____ 2202．MARi~L公约规定，近海移动式钻井装置驶向另一国(MAＲＰOL缔约国)时，应配IOPＰ证书。

A. is drilling on the Outer Continental Shelf B. moves to a new drilling location in U.S. waters C. engages in a voyage to a port of another country which is a party of MARPOL D. All of the above2203 The International Oil Pollution Prevention Certificate required by MARPOL is issued to China flag by the _____ 2203中国籍船舶IOPP证书是由CCS(中国船级社)签发的A. IMO B. CCS C. USCG D. PICC2204 The International Oil Pollution Prevention certificate is valid for a period of _____ 2204．IOPP证书有效期应该是4年，并可展期一年。

因此某些船级社签发的IOPP证书有效期是5年A. one year from the date of issue B. two years from the date of issue C. three years from the date of issue D. four years from the date of issue2205 A class "B" fire would most likely occur in the _____ 2205．B类火灾最容易发生在机舱舱底 A. main switchboard B. engine room bilge C. breathing compartment D. electric fresh water transfer pump 2202 C PP03 B 2204 D 2205 B2206On a tank vessel, which of the following substances would be burning in 2207 a class "B" fire? 2206．油类火灾即是B类火灾。

A. Oil B. Wood C. Rags D. Electrical wiring2207 Fire detecting systems on merchant vessels may be arranged to sense _____ 2207．商船上火灾探测系统可以通过感受烟雾或温升速度或游离粒子来实现监测，A. smoke B. rate of temperature rise C. ionized particles D. all of the above2208 If an oil spill occurs on deck, you should _____ 2208．如果甲板上溢油，应用吸收性材料覆盖A. cover the area with foam B. cover the area with absorbent material C. wash down immediately with a fire hose D. wash down immediately with an oil dispersing solvent 2209 Which of the listed burning materials would be described as a class "B" fire?2209．乙炔、滑汕、油脂等火灾都属于B类火灾。

A. Acetylene B. Lube oil C. Grease D. All of the above 2206 A 2207 D 2208 B 2209 D 2210 Radiation can spread a fire by _____ 2210．火灾能通过辐射方式扩散，通常是由于热量通过无障碍空间传递A. transmitting the heat of a fire through the ship's metal B. burning liquids flowing into another space C. heated gases flowing through ventilation systems D. the transfer of heat across an unobstructed space2211 In the event of a small bunker oil spill on deck occurring while bunkering , you should _____ 2211、如果甲板上溢油，应用吸收性材料覆盖。

A. wash down the area immediately with a fire hose B. wash down the area with kerosene C. cover the area with absorbent material D. cover the area with foam 2212 Small oil spills on deck can be prevented from contaminating any waters by _____ 2212．通过塞紧甲板疏水口，可防止甲板上溢油污染水域A. plugging all scuppers and drains B. placing floating booms around the ship C. regularly emptying all drip pans D. thoroughly draining all bunkering hoses2213 The scuppers should be plugged _____ 2213．船舶加油时应塞紧甲板疏水口。

A. only if fixed containment is not used B. only if portable containment is not used C. only if fixed containment drains are open D. whenever the vessel is being bunkered 2210 D 2211 C 2212 A 2213 D 2214 A class "C" fire would most likely occur in the _____ 2214．主配电板火灾是C类火灾A. engine room bilges B. main switchboard C. paint locker D. rag bin 2215 A class "C" fire would occur in _____ 2215．发电机火灾是C类火灾A. bedding B. pipe insulation C. paint D. a generator2216 A class "C" fire is burning _____ 2216．电气绝缘材料火灾是C类火灾。

A. diesel oil B. magnesium C. dunnage D. electrical insulation2217 Except in rare cases, it is impossible to extinguish a shipboard fire by _____ 2217．除了极少数例外，一般不可能通过取出燃料来扑灭船上火灾A. removing the heat B. removing the oxygen C. removing the fuel D. interrupting the chain reaction2218 Which of the listed materials would be considered as a burning class "C" fire?2218．电气绝缘材料火灾是C类火灾A. Fuel B. Wood C. Celluloid D. Electrical insulation2219On a cargo vessel, fire and boat drills must be held within 24 hours of 2220 leaving port if the percentage of the crew replaced is more than _____ 2219．对于商船，当新船员数量超过25％时，应在离港后24h内举行消防救生演习 A. 5% B. 10% C. 25% D. 40% 2214 B 2215 D 2216 D 2217 C 2218 D 2219 C 2220A fire, occurring in the windings, of an overloaded electrical motor, is considered a _____ 22212220．超负荷运转的电动机线圈上发生的火灾是C类火灾。

2222A. class "A" fire B. class "B" fire C. class "C" fire D. class "D" fire2221 Fire dampers prevent the fire spreading through the process of _____ 2221．挡火板能防止火灾通过对流扩散 A. convection B. conduction C. radiation D. direct contact2222A burning AC motor would be considered what class of fire?2222．交流电动机发生的火灾是C类火灾A. Class "A" B. Class "B" C. Class "C" D. Class "D"2223 Which of the following statements is least likely to cause the ignition of fuel vapors?2223．防爆灯一般不会引起燃油蒸汽着火。

A. Static electricity B. An open running electric motor C. loose wiring D. Explosion proof lights2224 If emergency welding repairs must be made to the upper area of a fuel tank, the tank and/ or adjacent compartments may need to be _____ 2224．如果要对燃油舱的上半区域进行应急焊接修理，该舱的相邻舱室需要除气或惰化并注满水 A. gas freed B. inerted C. filled with water D. all of the above as necessary 2220 C 222l A 2222 C 2223 D 2224 D2225 A fire may be spread by which of the following means?2225．火灾可以通过导热、对流、辐射等方式扩散。

A. Conduction of heat to adjacent surfaces B. Direct radiation C. Convection D. All of the above2226 A fire in an electrical generator is considered to be _____ 2226．交流发电机火灾是C类火灾A. Class "A" B. Class "B" C. Class "C" D. Class "D"2227 A fire and boat drill on a tank vessel shall, by regulation, include _____ 2227．油轮上消防救生演习应包括：启动救火泵、检查消防人员的装备以及有关的通信设备等 A. starting the fire pumps B. checking fireman's outfits and other personnel rescue equipment C. checking relevant communications equipment D. All of the above.2228Besides heat, fuel, and oxygen, which of the following is necessary for a fire to exist?2228．除了热量、油料、氧气，产生火灾还需要链反应。

A. Chain reaction B. Thermal action C. Chemical occlusion D. Pyrotechnical reaction2229 Which of the listed classes of fire is considered as one involving electrical equipment?2229．电气设备的火灾是C类火灾 A. Class "A" B. Class "B" C. Class "C" D. Class "D“ 2225 D 2226 C 2227 D 2228 A 2229 C 2230The class of fire on which a blanketing effect is essential to extinguish the fire is2231 _____ 2232 2230对于B类火灾，采用覆盖方式灭火是有效的。

2233A. class A B. class B C. class C D. class D2231 Which statement concerning the collection of fresh water is FALSE?2231淡水可以从海鱼中获取这一说法是不正确的A. Fresh water may be obtained from fish. B. Lifeboat covers or canopies should be washed with rain before drinking water is collected. C. Fresh water may be collected from condensation inside the life-raft. D. Freshwater cannot be produced from standing seawater.2232 If ignited, which of the listed materials would be a class "B" tire?2232。

柴油引起的火灾是B类火灾A. Magnesimn B. Paper C. Wood D. Diesel Oil2233 Which of the listed classes of fire would most likely occur in the engine room of a vessel?2233．船舶机舱内最多发生的是B类和C类火灾A. Classes A and B B. Classes B and C C. Classes C and D D. Classes A and D2234 One of the methods NOT usually allowed in cleaning up oil spills in the United States is _____ 2234．在美国，消除溢油，一般不允许使用分散剂 A. skimmers B. straw C. dispersants D. sawdust 2230 B 2231 A 2232 D 2233 B 2234 C2235 A class "D" fire would be considered as burning _____ 2235．轻金属镁引起的火灾是．轻金属镁引起的火灾是D类火灾。

类火灾 A. wood B. oil C. electrical equipment D. magnesium2236 Seawater may be used for drinking water _____ 2236．海水在任伺情况下都不得饮用．海水在任伺情况下都不得饮用 A. at a maximum rate 'of two ounces per day B. after mixing with an equal quantity of fresh water C. if gather during or immediately after a hard rain D. under no circumstance2237Which of the following gases represents the greatest threat to personnel safety 2238 in an engine room where the exhaust is leaking from a diesel engine?2237．．如果机舱内存在柴油机泄漏的废气，其中的一氧化碳对人员的安全威胁最大如果机舱内存在柴油机泄漏的废气，其中的一氧化碳对人员的安全威胁最大 A. Carboridioxide B. Carbon monoxide C. Carbon trioxide D. Hydrogen sulfide2238 Fires involving combustible metals are classified as _____ 2238．．轻金属引起的火灾是轻金属引起的火灾是D类火灾。

类火灾 A. class "A" fires B. class "B" fires C. class "C" fires D. class "D" fires2239 Which of the following components provides a direct source of seawater for the fire main system?2239．．海底阀箱可用向消防总管提供海水海底阀箱可用向消防总管提供海水 A. Rose box B. Sea chest or spool piece C. Sluice valve D. Fire pump stuffing box 2235 D 2236 D 2237 B 2238 D 2239 B 2240 A fire involving aluminum powder would be a class _____ 2240．轻金属铝引起的火灾是D类火灾 A . " A" fire B. " B" fire C. "C" fire D. "D" fire2241One of the disadvantages of using carbon dioxide to extinguish a fire in an enclosed space is _____ 2241．在封闭舱室，使用二氧化碳灭火的一个缺点是与高浓度二氧化碳气体长时间接触会 引起窒息。

A. the "snow" which is sometimes discharged along with the gas is toxic B. prolonged exposure to high concentrations of C02 gas causes suffocation C. rapid dissipation of the CO2 vapor D. the C02 gas is lighter than air and a large amount is required to extinguish a fire near the deck2242 The use of sinking and dispersing agents for the removal of surface oil is _____ 2242消除溢油使用的分散剂一般对海洋生物有害 A. the most common method used in the United States B. too expensive for common use C. generally safe to sea life D. generally harmful to sea life2243 Records of garbage disposal are required to be maintained _____ 2243．《垃圾记录簿》用完后至少留船保存两年。

A. until each quadrennial PSC inspection B. until the end of each voyage C. for a minimum of one year D. for a minimum of two years 2240 D 2241 B 2242 D 2243 D 2244A tank which has been sealed for a long period of time can be dangerous because 2245 _____ 2244、封闭了很长时间的舱室很危险，因为钢板表面由于生锈消耗了氧气 A. steel surfaces consume oxygen by resting B. sealed tanks usually form a vacuum C. moisture condenses in the tank, displacing the oxygen D. most tank coatings give off poisonous vapors in the presence of moisture 2245 Fires occurring in combustible metals, such as sodium or magnesium, are classified as a _____ 2245．轻金属铝引起的火灾是D类火灾。

A. class A B. class B C. class C D. class D 2246 A tank has been sealed and unventilated for a long period of time. Which of the following conditions does this indicate?2246．进入封闭了很K时间的舱室很危险，因为钢板表面山于生锈消耗了氧气A. The tank is safe to enter. B. The tank is especially dangerous to enter. C. Carbon monoxide is present. D. Water vapor present when the tank was sealed has oxidized. 2247 The most common type of containment device for spilled oil on the water is the use of _____2247．遏制水上溢油扩散的常川没备是围油栏。

A. straw B. booms C. skimmers D. chemical dispersants 2244 A 2245 D 2246 B 2247 B 2248 An example of class "A" fire is a/an _____ 2248．大厅地毯火灾是．大厅地毯火灾是A类火灾 A. electrical fire in the engine room B. oil fire in the engine room bilges C. oil fire involving a grade "A" petroleum product D. mattress fire in a stateroom 2249 The lowest temperature at which a liquid gives off enough vapor to ignite in the presence of _____ an ignition source is called its2249．在氧气存在的情况下，液体散发足够蒸汽着火时的最低温度，称为．在氧气存在的情况下，液体散发足够蒸汽着火时的最低温度，称为“闪点闪点”。

A. boiling point B. flash point C. viscosity point D. toxic point 2250 Why is it necessary to warn engine room personnel before activating the fixed C02 system?2250．在施放固定式二氧化碳系统前，应警告轮机部人员，让他们离开机舱．在施放固定式二氧化碳系统前，应警告轮机部人员，让他们离开机舱 A. To make them aware there is a fire. B. To let them know they should leave the engine room. C. To prevent possible injury from frostbite. D. To make them aware that ventilation will automatically stop. 2248 D 2249 B 2250 B2251 In cleaning up an oil spill, the use of chemical agents would _____ 2251．消除溢油时，使用的化学剂将分散或溶解水中的油。

A. absorb the oil for easy removal B. remove the oil from the water C. disperse or dissolve the oil in the water D. not affect the oil 2252 If fuel is burned from only the starboard tanks, the ship will _____ 2252．如果长时间仅仅使用右舷燃油舱的燃油，船舶将向左倾斜A. go down by the head B. list to starboard C. trim by the stem D. list to port2253Which of the following statements is true concerning carbon dioxide when used as 2254 a fire extinguishing agent?2253．二氧化碳用于扑灭B类火灾时，其窒息效果最好。

A. Carbon dioxide is con'osive when exposed to fire. B. Carbon dioxide should be applied slowly to a large engine room fire. C. Its total cooling effect is far greater than water. D. Its smothering effect is excellent for class B fires.2254 A fire in a pile of canvas would be classified as a _____ 2254．帆布着火是A类火灾 A. class A B. class B C. class C D. class D 2251 C 2252 D 2253 D 2254 A2255 In cleaning up an oil spill, the use of straw or reclaimed paper fibers would be an example of which type of oil removal? 2255．使用稻草或再生纤维纸来清除溢油，属于吸收式消油方法。

A. Chemical agent removal B. Mechanical removal C. Absorbent removal D. None of the above.2256 A fire in a pile of dunnage would be classified as a _____ 2256．垫舱木材着火是A类火灾A. class A B. class B C. class C D. class D2257A fire involving trash and paper waste would be classified as a _____ 2257．废纸着火是A类火灾A. class A B. class B C. class C D. class D 2258 Hydrocarbon vapors are usually detected by the use of the _____ 2258．烃类气体可通过可燃气体指示器来检测。

A. flame safety lamp B. combustible gas indicator C. gasometer D. oxygen indicator 2259 While reading the station bill, you fmd "three (3) short blasts on the whistle and three (3) short rings on the general alarm bells," this signal is for _____ 2259．“鸣3个短声并敲3短声”，表示演习结束相当于"6s长声”A. abandon ship B. dismissal from fire and emergency stations C. fire and emergency D. man overboard2260 Most lifeboats are equipped with _____ 2260．绝大多数救生艇装不平衡舵。

A. unbalanced rudders B. balanced rudders C. contraguide rudders D. straight redders 2255 C 2256 A 2257 A 2258 B 2259 B 2260 A2261For which of the listed classes of fire combinations would carbon dioxide be most suitable as 2262 the extinguishing agent _____ 2261．二氧化碳最适于扑灭B类、C类火灾A. Class "A" and class "B" B. Class "B" and class "C" C. Class "A" and class "C" D. Class "C", class "D" , and class "E"2262 Your vessel is taking on bunkers from a shore side facility. If oil begins flowing from one tank vent, which of the following actions should be taken FIRST ?2262．靠油码头加油时，发现燃油从油舱透气口流出，应迅速通知码头控制站停泵。

A. Open the intake valve to an adjacent tank. B. Set out drip pans and sawdust and begin to mop up the spill. C. Signal the shore control point to shutdown. D. Close the valve on the tank vent line.2263 A fire in a pile of linen is considered to be a class _____ 2263．麻布着火是A类火灾A. A fire B. B fire C. C fire D. D fire 2264 A combustible gas indicator is used to determine _____ 2264．可燃气体指示器可用来检测空气中可燃气体或蒸汽的存在： A. if there is sufficient oxygen to support life B. the toxicity of flammable gases or vapors C. the amount of C02 present in flue gas D. the presence of flammable gases or vapors in the air 2261 B 2262 C 2263 A 2264 D2265Your vessel is taking on fuel oil when a small leak develops in the hose and you have ordered 2266 the pumping stopped. Before resuming pumping you should _____ 2265．船舶加油时，发现加油软管漏油，应首先停泵，然后更换软管，再重新泵油。

A. notify the terminal superintendent B. place a large drip pan under the leak and plug the scuppers C. repair the hose with a patch D. replace the hose9966 While loading bulk oil, you notice oil on the water near the barge. Which of the following actions should you carry out FIRST?2266．船舶加油时，发现油驳旁水面有油，应迅速停泵A. Search the vessel for leaks B. Notify terminal superintendent C. Stop loading D. Notify the Coast Guard2267 Before entering a fuel tank that has been cleaned, it should be checked with an oxygen indicator and a/an _____ 2267．在进人已清洁的燃油舱前，应使用氧指示仪和可燃气体指示仪来检测-A. Orsat apparatus B. flame safety lamp C. Halide torch D. combustible gas indicator2268 When you notice oil on the water near your vessel while taking on fuel, you should FIRST_____2268．船舶加油时，发现船舶附近水面有油，应迅速停泵。

A. stop loading B. notify the senior deck officer C. notify the terminal superintendent D. determine whether your vessel is the source 2265 D 2266 C 2267 D 2268 A 2269If you detect oil in the water around your vessel while discharging fuel, the FIRST thing to do is 2270 _____ 2269．船舶排油时，发现船舶附近水画有油，应迅速停泵，A. try to find out where the oil is coming from B. call the Master C. have the pump man check the discharge piping D. shutdown operations2270 While taking on fuel, you notice oil on the water around the vessel. Which of the following actions should be taken FIRST?2270．船舶加油时，发现船舶附近水面有油，应迅速停泵。

A. Stop fueling B. Notify the dispatcher C. Notify the terminal superintendent D. Determine if your vessel is the source2271 If you observe any situation which presents a safety or pollution hazard during fuel transfer operations, which of the following actions should be taken FIRST?2271．燃油驳运期间，发现存在安全或污染危险，应迅速停止驳油操作A. Close the valves at the transfer manifold. B. Notify the person in charge of the shore facility. C. Shut down the transfer operation. D. Sound the fire alarm..2272 If an incorrect entry were made in the Oil Record Book, you should _____ 2272、如果在《油类记录簿》上记错了，应在记错处划线，并从头重新记录 A. erase the entry and rewrite it B. notify the ship's officer-in-charge C. completely black it out and make the Correct entry alongside D. draw a single line through the wrong entry and initial it 2269 D 2270 A 2271 C 2272 D2273 The sections of an Oil Record Book proceeding the log pages contain a _____ 2273．《油类记录簿》第一部分用于记载机器处所有关操作事项。

A. damage control plan for isolating fire main valves B. list of machinery space operation items C. complete classification of hazardous materials D. detailed listing of all organizations to call in the event of an accidental oil spill2274 Which statement regarding garbage disposal is correct?2274．在港期间，将垃圾排到岸上接收设施，应作记录A. Records for ground garbage disposal are not required when disposal into the sea occurs more than 25 miles offshore. B. Discharging or transfer of garbage while in port to a shore facility must be recorded. C. Maintaining records for the incineration of garbage aboard ship is not required. D. The recording of garbage disposal should include the approximate weight.2275 How long warning must be provided by the CO2 warning alarm before CO2 is discharged into a space _____ 2275．二氧化碳施放前，必须警报20s。

A. 5 seconds B. 10 seconds C. 15 seconds D. 20 seconds2276 C02 extinguishes a fire by _____ 2276．二氧化碳是通过窒息来灭火的 A. a blanket of bubbles formed on the surface of the fire B. smothering C. cooling D. isolating the heat from the fuel 2273 B 2274 B 2275 D 2276 B2277 You can find the location of your abandon ship post by checking the _____ 2277．从应急部署表，可知道弃船时各人员的位置．从应急部署表，可知道弃船时各人员的位置A. vessel's logbook B vessel' s documentation C. muster list D. Certificate of Inspection2278 When off loading garbage to another ship, your records must identify that ship by name and _____ 2278．将垃圾排到另一艘船舶，记录应标明该船的船名和官方正式的登记号。

．将垃圾排到另一艘船舶，记录应标明该船的船名和官方正式的登记号 A. home port B operator' s name of record C. official number D waster's name2279Your assigned emergency stations ~ your vessel can be found on the ship's _____ 2279．．从应急部署表，可知道应急情况时各人员的位置从应急部署表，可知道应急情况时各人员的位置A. muster list B. certificate of inspection C. clearance papers D. permit to proceed2280Fire and lifeboat stations are required to be listed on the _____ 2280．．应急部署表上应标明消防、救生艇等场所应急部署表上应标明消防、救生艇等场所。

A ship's articles B. muster list C. bunk card D. forecastle card2281 In order to find out which lifeboat you are assigned, you should look at the _____ 2281．．从应急部署表，可知道各人员被指派的救生艇号从应急部署表，可知道各人员被指派的救生艇号 A. fire control plan B. certificate of inspection C. muster list D ship' s articles 2277 C 2278 C 2279 A 2280 B 2281 C 2282 A vessel sailing through the specific special areas may discharge or dispose of _____ 2282．船舶在特殊区域排放食品废物，应距最近陆地12nmile。

A. incinerated ash at anytime B. fairly dense material that will sink, i.e. metal cans or glass bottles at anytime C. victual waste when at least 12 nautical miles from shore D. absolutely no garbage at anytime2283The process that occurs when heat is generated by a chemical reaction within a substance and 2284 continues to a point of ignition is known as _____ 2283．一种物质内部由化学反应产生热量而燃烧，这一过程称为“自燃”A. chemical ignition B. spontaneous combustion C. chemical combustion D. radiation ignition2284 When an oil fire has been extinguished, the surface of the oil should be kept covey foam to prevent _____ 2284．油类火灾已扑灭，油的表面应覆盖泡沫以防止空气与油蒸汽接触。

A. air from contacting the oil vapors B. permitting re-ignition boiling of the heated oil C. spontaneous combustion below the oil surface D. toxic fumes from escaping to the surface2285 In the event of a fire, the doors to a stair tower must be closed to prevent the spread of fire by _____ 2285．发生火灾时，有关门、通风口应关闭，以防火灾通过对流而扩散 A. convection B. conduction C. radiation D. ventilation 2282 C 2283 B 2284 A 2285 A2286 During oil transfer operations, who would be responsible to guarantee that the posted procedures are being followed? 2286．燃油驳运期间，应指定人员，确保按既定的驳运程序进行。

A. The designated person in charge B. The tanker man C. The' senior able seaman D. The oiler2287 The longer an oil fire is permitted to bum, the _____ 2287．汕类火灾燃烧时间越长，扑灭就越难A. harder it is to extinguish B. easier it is to extinguish C. less chance there is of re-ignition D. easier it is to control2288Fires resulting from spontaneous combustion are usually caused by the improper disposal of _____ 2288．由于不恰当地处置油布，会因自燃而发生火灾A. cigarette butts B. oily rags C. burner torches D. lighted matches2289 A person on a fixed, or floating platform engaged in oil exploration, located 10 nautical miles from nearest land MAY discharge _____ 2289，距最近陆地10nmile的固定式或移动式钻井平台，不能排放食品废物；经粉碎，颗粒直径小于1沁的食品废物；经粉碎，颗粒直径小于¨n的废纸等任何废物。

因为距最近陆地12nmile以上的固定式或移动式钻井平台才能排放食品废物 A. food waste B. food, ground to less than 1" C. paper, ground to less than 1" D. None of the above 2286 A 2287 A 2288 B 2289 D2290Why should you wear a self-contained breathing apparatus before entering the engine room after 2291 the fixed CO2 system has been discharged to combat a major fire? 2290在进入已施放二氧化碳的机舱时，应戴呼吸面具，以防窒息A. Because carbon dioxide dilutes the oxygen concentration in the atmosphere and may cause asphyxiation. B. Because carbon dioxide breaks down in a fire into carbon monoxide which may cause blood poisoning in the person breathing this gas. C. Because carbon dioxide is a colorless and odorless gas that becomes highly toxic in the presence of high temperatures and will quickly incapacitate a person exposed to this gas. D. This action is unnecessary as carbon dioxide is not poisonous nor toxic but is a relatively ham~ess gas.2291 A person on a fixed or floating platform engaged in oil exploration MAY discharge food waste into the sea when the distance from the nearest land is at least _____ 2291．距最近陆地12nmile以上的固定式或移动式钻井平台才能排放食品废物。

A. 3 nautical miles B. 5 nautical miles C. 12 nautical miles D. 25 nautical miles2292 In which of the areas listed is a fire resulting from spontaneous combustion most likely to oc- cur?2292．油漆间最容易因自燃而发生火灾 A. Engine room bilges B. Paint locker C. Battery storage locker D. Fuel oil tank 2290 A 2291 C 2292 B2293Which of the circumstances listed is an exception to the garbage discharge 2294 requirements in Annex V to MARI~L 73/78? 2293．．如果人员落水，抛投塑料板用于救人时，此种情况不受如果人员落水，抛投塑料板用于救人时，此种情况不受MARPOL73／／78附附则则V有关垃圾排放要求的限制。

有关垃圾排放要求的限制A. The garbage to be discharged will sink. B. Garbage accumulation o~ has exceeded storage space. C. A person falls overboard, and a plastic ice chest is thrown for flotation. D. The destination port or terminal cannot receive garbage.2294 The most likely place for a fire to start through the process of spontaneous combustion is in _____ 2294，，油布箱最容易因自燃而发生火灾油布箱最容易因自燃而发生火灾A. an electrical switchboard B. the pressure tanks C. the fuel oil tanks D. the oily rag bin2295 When welding or burning aboard a vessel, you must be certain that the space _____ 2295．．船上施焊时，应确保通风、无易爆蒸汽、舱底无油等安全要求。

船上施焊时，应确保通风、无易爆蒸汽、舱底无油等安全要求A. is properly vented B. contains no explosive fmnes C. has no oil in the bilges D. All of the above2296 To prevent the spread of fire by convection you should _____ 2296．．发生火灾时，有关门、通风口应关闭，以防火灾通过对流而扩散发生火灾时，有关门、通风口应关闭，以防火灾通过对流而扩散A. remove combustibiles from direct exposure B. cool the bulkhead around the fire C. close all openings to the area D. shut off electrical power2297 The term "discharge", as it applies to the pollution regulations, means _____2297．．油污规则中，术语油污规则中，术语“排放排放”指的是溢油、漏油或倾倒指的是溢油、漏油或倾倒 A. spilling B. leaking C. dumping D. All of the above 2293 C 2294 D 2295 D 2296 C 2297 D2298If a small fire initially breaks out in the engine room bilges, in which of the following2299 sequences should the fire extinguishing agents or systems be used? 2298．消防系统一般应用次序是：手提式灭火器、半手提式灭火器、固定式二氧化碳系统：A. Fixed C02, semi-portable CO2, then hand portable CO2. B. Semi-portable CO2, fixed CO2, then hand portable CO2. C. Hand portable, semi-portable CO2, then as a last resort the fixed CO2 system. D. Hand portable, fixed CO2, then as a last resort the semi-portable CO2. 2299 The vapors given off by heated fuel oil are flammable, explosive, and _____ 2299．燃油加热而蒸发的蒸汽具有可燃性、爆炸性，而且比空气重。

A. lighter than air B. heavier than air C. odorless D. nontoxic 2300 Fire prevention during welding or burning aboard any vessel should include _____ 2300．船上施焊时，防火要求有：在敏感区域值班观察；准备好能迅速使用的灭火器；焊接工作结束后，值班观察应继续30min A. posting a fire watch in the immediate area B. providing an extinguisher which is ready for immediate use C. requiring the fire watch to remain on post for 30 minutes after the completion of welding or burning D. All of the above. 2298 C 2299 B 2300 D2301 You are about to enter a compartment to investigate a suspected smoldering fire. If you're not wearing an self-contained breathing apparatus, you should test the compartment' s atmosphere to determine if there is/are _____ 2301．在进入可能存在闷烧的舱室时，如果不戴呼吸面具，应注意测试舱室内是否有足够的氧气：是否存在爆炸性气体；是否存在有毒气体。

A. sufficient oxygen to sustain human life B. an explosive mixture in the compartment C. a toxic atmosphere in the compartment D. All of the above.2302If it becomes necessary to pump bilges while a vessel is in port, which of the following procedures should be followed?2302．在港口期间，如果船舶要排放舱底水，只能排到岸上接受设施或接受船舶 A. Pump only if the discharge is led to a shore tank or barge. B. Pump only during the hours of darkness. C. Pump only on the outgoing tide. D. Pmnp only as much as is necessary.2303 The vapors given off by heated fuel oil are heavier than air and are _____ 2303．燃油加热而蒸发的蒸汽具有可燃性、爆炸性，而且比空气重。

A. odorless B. explosive C. nontoxic D. visible2304 All of the following are part of the fire triangle EXCEPT _____ 2304．火灾三要素：可燃物(燃油)；助燃物(氧气)和着火源(热量) A. fuel B. oxygen C. heat D. electricity 2301 D 2302 A 2303 B 2304 D 2305 Diesel fuel vapors _____ 2305．燃油加热而蒸发的蒸汽具有可燃性、爆炸性，而且比空气重A. can not be ignited by a spark unless the vapor is in a confined space B. are nontoxic in all concentrations C. can not be ignited by a spark unless they are at their auto-ignition temperature D. are heavier than air2306When approaching a fire from win ward, you should shield firefighters from the2307 fire by using _____ 2306．当从下风口接近大火时，应使用低速水雾来掩护消防员。

A. low-velocity fog B. high-velocity fog C. a straight stream of water D. foam spray2307 The best method of extinguishing a class A fire is to _____ 2307．扑灭A类火灾最好方法的方法是将燃烧物(燃料)冷却到着火点以下A. remove oxygen from the area B. smother fire with foam C. smother fire with C02 D. cool fuel below ignition temperature2308 Where should muster lists be posted?2308应急部署表应张贴在船员舱室、驾驶台、机舱等区域 A. In crew s accommodation spaces B. On the navigating bridge C. in the engine mom D. All of the above. 2305 D 2306 A 2307 D 2308 D 2309 In the fire main system, quick cleaning strainers are located at the _____ 2309．在消防系统中，快速清洗滤器位于消防栓处。

A. pump suctions B. pump discharge C. fire hydrants D. hose nozzle2310 Which of the listed extinguishing agents is NOT suitable for fighting a liquid paint fire?2310．水不适于扑灭液态油漆引起的火灾A. Dry chemical B. Foam C. Water D. Carbon dioxide2311 As its temperature rises, the volume of fuel oil in the tanks will _____ 2311．温度升高时，油舱内燃油的体积增大 A. remain the same B. increase C. decrease D. none of the above2312 The heat generated by a fire will be transferred through a bulkhead or deck, as a result of _____ 2312．火灾产生的热量，由于热传导，从舱壁传递。

A. conduction B. radiation C. convection D. advection2313The rate of expansion of heated fuel oil varies with the _____ 2313．高温燃油的膨胀速率随密度而变化A. conductivity B. viscosity C. volume D. specific gravity2314Combustible material stored in a compartment adjacent to a compartment where there is a fire 2315 may be ignited. This ignition can occur by _____ 2314．可燃物贮存在与发生火灾的舱室相邻的舱室内，来自于甲板或舱壁的辐射热会引起 它着火 A. heat convection through the adjacent bulkheads B. combustion gases carried through the ventilation system C. direct convection of the heat emitted by the adjacent fire D. heat radiated from the deck or bulkhead by the adjacent fire 2309 C 2310 C 2311 B 2312 A 2313 D 2314 D 2315The spreading of fire as a result of heat being carried through a vessel's ventilation 2316 system, is an example of heat transfer by _____ 2315，通过船舶通风系统带入热量而使火灾扩散，这是由对流实现热量传递的实例。

A. conduction B. convection C. radiation D. windage2316 When you hear three short blasts on the ship's whistle and the same signal on the general Mann bells, you _____ 2316．“鸣3个短声并敲3短声”，表示演习结束相当于"6s长声”A. are required to go to your life-raft B. are dismissed from drills C. should point to the man overboard D. should start the fire pump9317 While reading the muster list, you see that "three short blasts on the ship's whistle and the same signal on the general alarm bells" is the signal for _____ 2317．“鸣3个短声并敲3短声”，表示演习结束。

相当于"6s长声”A. abandon ship B. dismissal from drills C. fire and emergency D. man overboard2318 If a fire ignites in the engine room as a result of a high pressure fuel oil leak, you should FIRST _____ 2318．机舱内，由于高压燃油泄漏而着火，应首先切断燃油供应 A. secure the ventilation B. find a soda acid extinguisher C. shut off the fuel oil supply D. secure the generator 2315 B 2316 B 2317 B 2318 C 2319 D2319 A fire can be extinguished by removing _____ 2319．去除火灾3要素：可燃物(燃油)；助燃物(氧气)和着火源(热量)中的任何一个要素 都可实现灭火的目的。

A. the heat B. the fuel C. the oxygen D. any of the above2320The four basic components of a fire are fuel, heat, oxygen and a chain reaction. Which of the following statements best describes what must be eliminated to extinguish a fire?2320去除火灾发生的4个条件：可燃物(燃油)；助燃物(氧气)、着火源(热量)和链反应中 的任何一个条件都可实现灭火的目的 A. Any one component can be eliminated to extinguish a fire. B. Any two components must be eliminated to properly extinguish a fire. C. Any three components must be eliminated to properly extinguish a fire. D. All four components must be eliminated to extinguish any fire.2321The FIRST step to take in fighting an engine room fire resulting from a ruptured fuel oil 2322 service line, is to _____ 2321．机舱内，由于燃油供应管路泄漏而着火，应首先阻止泄漏的燃油流动。

A. evacuate all engine room personnel B. fight the fire with hand portable extinguishers C. activate the main C02 bank D. stop the flow of leaking fuel oil2322 The four basic components of a fire are chain reaction, heat, fuel, and _____ 2322．火灾发生的4个条件：可燃物(燃油)；助燃物(氧气)、着火源(热量)和链反应 A. carbon monoxide B. oxygen C. carbon dioxide D. any gaseous substance 2319 D 2320 A 2321 D 2322 B 2323If a fire occurs in the boiler room as a result of a leaking fuel line, you should FIRST ____2324 2323．锅炉房内，由于燃油供应管路泄漏而着火，应首先隔离并切断燃油管系。

2325A. notify the engineer on watch B. isolate and secure the piping C. throw sand on the fire D. extinguish the fire using a combination nozzle with applicator2324 Engines for lifeboats are required to have sufficient fuel to operate for how many hours?2324．救生艇发动机应具有能运行24h的油料A. 6 hours B. 12 hours C. 18 hour, s D. 24 hours2325 The three basic elements necessary for any fire are _____ 2325．火灾3要素：可燃物(燃油)；助燃物(氧气)和着火源(热量)A. heat, gas, and flames B. fuel, heat, and oxygen C. heat, nitrogen, and fuel D. fuel oil, nitrogen, and oxygen2326 When fighting a spreading fire resulting from a broken fuel line, you should FIRST _____ 2326．为了防止因燃油管破裂引起的火灾扩散，应首先切断燃油供应。

A. look for a C02 extinguisher B. use a soda acid extinguisher C. shut off the fuel supply D. smother the fire with rags2327 When making entries in the Oil Record Book, all quantities should be _____ 2327．填写《油类记录簿》时，所有数量的单位应统一(加仑、桶或立方米) A. recorded as cubic meters with a conversion to barrels B. verified by the Chief Engineer C. recorded directly from the oil discharge monitor D. consistently recorded through the Oil Record Book in one specified unit (gallons, barreis, cubic meters) 2323 B 2324 D 2325 B 2326 C 2327 D2328 An oxygen indicator will detect _____ 2328．氧指示仪用于检测含氧量。

A. the amount of oxygen in a space B. the presence of harmful amounts of carbon monoxide C. concentrations of explosive gas D. All of the above2329 The volatility of a liquid is the tendency of a liquid to _____ 2329．液体的蒸发性是液体趋于蒸发的能力A. ignite B. explode C. asphyxiate D. vaporize2330Which of the following conditions is true concerning a flammable liquid with a 2331 concentration above the upper explosive limit?2330．如果可燃液体的浓度超过爆炸上限，因浓度太高而不会燃烧。

A. The mixture is too lean to bum. B. The mixture is too rich to bum. C. The vapor is about to explode. D. Conditions are perfect for combustion.2331 In fighting a fire in a fuel tank, the FIRST action you should attempt is to _____ 2331．扑灭燃油舱内火灾，应首先阻止新鲜空气进入油舱 A. secure all sources of fresh air to the tank B. begin transferring the fuel to other tanks C. top off the tank to force out all vapors D. station someone at the fixed C02 release controls 2328 A 2329 D 2330 B 2331 A 2332 The FIRST course of action in fighting a fire in a cargo or fuel oil tank is to _____ 2332．见上题：A. secure all openings to the tank B. discharge an initial charge of C02 with a hand portable extinguisher C. direct a fire hose into the tank and energize the fire main D. spray the tank boundaries with a fire hose to promote cooling2333 Which of the actions listed should be taken FIRST to control an oil fire in a fuel oil tank?2333．见第2331题。

A. Commence draining that tank as quickly as possible. B. Seal off all vents to that tank. C. Activate the C02 system to that tank. D. Shut off the steam heating coils.2334The necessity for administering artificial respiration may be recognized by the victim's _____ 2334．如果发现受难者皮肤发青，呼吸困难，应对其人工呼吸A. vomiting B. blue color and lack of breathing C. irregular breathing D. unconscious condition2335 All personnel should be familiar with the lifeboats _____ 2335．船上所有人员应熟悉登乘救生艇以及救生艇操作程序。

A. boarding and operating procedures B. maintenance schedule C. navigational systems D. fuel consumption rates 2332 A 2333 B 2334 B 2335 A2336While working in the engine room, you hear seven short blasts followed by one long blast on the 2337 ship's whistle, supplememed by the same signal on the general alarm bells. You should _____ 2336．“鸣1个长声后敲7短声”，表示到救生艇甲板集合 A. start the fire pump to charge the fire main B. standby the main console and await orders from the engineer on watch C. go to your fire station D. go to your lifeboat station2337 When combating a major electrical fire at sea, the main consideration is _____ 2337．扑灭电气设备引起的火灾时，应防止对人员造成电击。

A. reducing the possibility of electrical shock to personnel B. preventing a total loss of electrical power C. preventing saltwater damage to electrical equipment D. eliminating the toxic fumes from burning insulation2338 Before attempting to put out a class "C" fire involving an electric-driven centrifugal pump, you should FIRST _____ 2338．扑灭C类火灾，应首先切断电流 A. insulate your shoes B. ground the fire hose C. secure its power supply D. start the fire pump2339 ff the diesel fuel vapors present are within the flammable range _____ 2339．如果在可燃范围内存在燃汕蒸汽，一旦出现火源，就会爆炸。

A. the vapor air mixture is too rich to bum B. an explosion may occur if a source of ignition is present C. the vapor air mixture is too lean to bum the upper explosive D. limit has been exceeded 2336 D 2337 A 2338 C 2339 B2340You are transferring fuel from the storage tanks to the day tanks by means of an 2341 electric fuel oil transfer pump. If the pump motor catches fire, you would FIRST _____ 2340．发现电动机发生火灾，应首先切断电流A. secure the fuel manifold B. shut off power to the pump C. shut off the power ventilation D. spray water on the fire2341 When fighting an electrical fire, you should first _____ 2341．当扑灭电气设备火灾时，首先应切断电源。

A. stop ventilation to the area B. stop the vessel C. secure electricity to the circuit D. apply CO2 to the fire 2342 If the buoyant force on a ship's hull is equal to or greater than the displacement tonnage, the ship will _____ 2342．如果船体浮力等于或大于船舶的排量，船舶就能浮在水面上A. require ballast added to only the port side tanks B. be down by the head C. sink D. float2343 Diesel fuel is relatively safe to handle due to its low volatility, but the fumes wi11 self-ignite and continue to burm steadily if the fuel is heated to the _____ 2343．燃油由于挥发性较差，相对较安全，但是如果把它加热到自燃点，就会自动燃烧。

A. flash point B. auto-ignition point C. volatility point D. upper explosive limit 2340 B 2341 C 2342 D 2343 B2344In the first 24 hours after abandoning a vessel, water should be given only to 2345 personnel who are _____ 2344，弃船后前24h，只能给病员或伤员供水A. thirsty B. sick or injured C. wet D. awake2345 If you have to abandon ship and enter a life-raft, your main course of action should be _____ 2345．弃船后，人员进入救生筏，应尽可能留在船舶附近，以利于搜救。

A. remain in the vicinity of the vessel B. head for the closest land C. head for the closest sea-lanes D. get a majority opinion2346 The abandon ship signal sounded by the vessels whistle is _____ 2346，“6个以上短声加l长声”表示弃船信号A. 6 short blasts and 1 long blast B. long blast more than 6 short blasts C. more than 6 short blasts and 1 long blast D. 1 long blast of at least 10 seconds2347 You hear the general alarm bells and ships whistle sound for over 10 seconds. Traditionally, this is the signal for _____ 2347．船舶警报器或气笛鸣放10s以上，表示火警应急信号。

A. abandon ship B. dismissal from drills C. fire and emergency D. lower lifeboats 2344 B 2345 A 2346 C 2347 C 2348If a C02 fire extinguisher is not readily available, which of the listed fire 2349 extinguishers would be best suited to combat a small electrical fire in a switch?2348．除了二氧化碳灭火器外卤素灭火器也可用来扑灭电气设备火灾 A. Dry chemical B. Halon C. Low velocity fog D. Steam2349 To extinguish an electrical fire, you should use _____ 2349．见上题。

A. mechanical foam B. chemical foam C. carbon dioxide D. soda acid2350 Which of the following represents the emergency signal for fire aboard ship?2350．船舶警报3s或气笛鸣放10s以上，表示火警应急信号A. More than six short blasts and one long blast on the whistle. B. Continuous blast of the ship's whistle for a period of not less than 10 seconds supplemented by the same signal on the general alarm. C. Three short blasts of the whistle supplemented by the same signal on the general Mann. D. More than six short blasts and one long. blast on the whistle supplemented by the same signal on the general Mann.2351 Which of the fire extinguishing agents listed is the safest to use when combating a class C fire?2351．见第2348题。

A. CO2 B. Foam C. Water fog D. Soda acid 2348 B 2349 C 2350 B 2351 A 2352Which of the listed fire extinguishers is recommended for use on an electrical 2353 switchboard fire? 2352，见第2348题 A. CO2 B. ABC dry chemical C. CO2 propelled foam D. All of the above.2353 Which of the petroleum products listed has the lowest flash point?2353．液压油、滑汕、柴油和冷冻机油中，柴油的闪点最低A. Hydraulic oil B. Lubricating oil C. Diesel oil D. Refrigeration oil2354After a fire has been extinguished in a closed space., personnel may safely enter the space when _____ 2354．密闭空间灭火后，消除所有烟雾、毒气，并有足够供氧量时，人员方可进入。

A. smoke density has been decreased sufficiently to see the bulkhead opposite the compartments entrance B. a lifeline and explosion proof flash light are used C. all smoke and toxic fumes are removed and an adequate oxygen supply is present D. overhaul has been completed to remove any possible source of re-ignition2355 If there has been a fire in a closed unventilated compartment it may be unsafe to enter because of _____ 2355．封闭舱室内发生火灾，因为内部缺氧，人员进入会很不安全 A. unburned carbon particles B. excess nitrogen C. a lack of oxygen D. excess hydrogen 2352 A 2353 C 2354 C 2355 C2356When reentering an engine room that has been flooded with CO2, the investigating team should 2357 initially _____ 2356．机舱施放二氧化碳后，人员应从机舱最高处进入。

A. leave the access door partially open B. enter from the lowest level C. enter from the highest level D. attempt to operate machinery2357 You may improve a vessel's stability by _____ 2357．尽可能将燃汕舱注满，能提高船舶稳性A. keeping the fuel tanks topped off B. increasing the free surface effect C. keeping the fuel tanks at least haft full D. keeping at least one fuel tank empty for slops2358 In order to find out which lifeboat you are assigned, you should look at the _____ 2358．从张贴的船舶应急部署表，可知道人员被指派的救生艇号。

A. Certificate of Inspection B. Station Bill C Ship's Articles D. Fire Control Plan2359 Which of the following statements is tree concerning Halon 1301 fire extinguishing equipment?2359．对于130l卤素灭火器，灭火介质在室温、低浓度时无毒性 A. The agent is considered nontoxic at room temperature in low concentrations. B. The agent is less effective than carbon dioxide. C. Halon primarily extinguishes the fire by cooling. D. The agent cannot be used on electrical fires because it leaves a residue. 2356 C 2357 A 2358 B 2359 A 2360The stability of a vessel is normally the greatest when all fuel and water tanks are full because the 2361 _____ 2360．当所有水舱和燃油舱都注满时，由于重心降低，船舶的稳性最好。

A. center of gravity is lowered B. center of buoyancy is lowered C. reserve buoyancy is unchanged D. hull freeboard is increased2361 When checking the liquid level in a tank, you should position yourself _____ 2361．当检查舱内液位时，应与风向成合适角度，以免吸人有毒气体A. on the windward side of the opening B. on the leeward side of the opening C. at a right angle to the wind direction D. so that the obstruction of your body will protect you from the fumes2362 Which of the listed fire extinguishers cannot be easily recharged aboard ship?2362．对于二氧化碳灭火器，一般不能在船上重新充注介质。

A. Soda acid B. Carbon dioxide C. Dry chemical D. Cartridge-operated Foam2363 A carbon dioxide fire extinguisher has been partially discharged, and should be immediately _____ 2363．二氧化碳灭火器施放后，应作“已空”标签，并与已充注的二氧化碳灭火器分开 A. tagged and restowed properly in its rack B. weighed and the charge loss recorded C. given to the chief engineer for recharging D. tagged "empty" and stowed separately from charged extinguishers 2360 A 2361 C 2362 B 2363 D 2364Which of the fire extinguishers listed is to be weighed annually and sent ashore for recharging2365 if the weight loss exceeds 10% of the weight of a full charge? 2364．对于二氧化碳灭火器，应每年称重，当重量减少10％时，应重新充注介质。

A. Foam B. Soda acid C. Dry chemical D. Carbon dioxide2365 Before the seas get rough, it is a good safety practice to2365．大风浪前，安全准备工作包括对松动装置进行绑扎 A. secure loose gear B. move quickly about the ship C. increase lighting D. shutdown auxiliary equipment2366 Which of the precautions listed should be observed when taking on diesel fuel?2366，船舶加装燃油时，应禁止在现场吸烟 A. Secure all lighting to the main deck B. Provide a portable fan to blow away fumes C. Prohibit smoking in the area D. Display a black triangle during daylight hours2367 To avoid excessive pressures in the fuel oil filling system during bunkering, you should _____ 2367、加油期间，当油舱接近满舱时，应降低泵速，以免加油管产生过高压力 A. close the tank filling valves quickly B. top off all tanks at the same time C. fill completely all tanks to less than 95% full D. reduce the loading rate when topping off 2364 D 2365 A 2366 C 2367 D2368 The term "load on top" is used on many crude oil carriers, is to provide a method for _____ 2368。

油轮上采用的“装于上部法”，意即将新装货油装到残油舱，以减少污染A. calculating the ullage in the cargo tanks B. loading ballast by gravity C. the loading of new cargo into the slop tank as a procedure to minimize pollution D. calculating the ratio of cargo expansion in a cargo tank2369 The safe rate of bunkering heavy fuel oil is directly related to the _____ 2369．加装燃油的安全速率与燃油的温度直接有关A. type of fuel transfer pump aboard B. temperature of the fuel oil being received C. size of the fuel storage tanks ashore D. distance from the fuel oil storage tanks ashore2370 One precaution to take prior to working in a freshly painted compartment where there are an excessive amount of paint fumes, is to _____ 2370．在进入刚刚油漆过的舱室前，应对其实施通风。

A. take shallow breaths of air B. ventilate the area C. wear a breathing apparatus while working D. keep a charged fire hose handy2371 Your ship has nm aground and it is necessary to determine whether or not a compartment has flooded. Therefore, you should _____ 2371．船舶搁浅后，要判断一个舱室是否进水，可以使用榔头敲击舱壁检查水位的卜况来判断 A. open the watertight door and take a quick look B. open the hatch dogs on the side away from the hinges C. tap the bulkhead with a hammer to check for a water level D. feel the bulkhead to see if it is hot 2368 C 2369 B 2370 B 2371 C 2372 After taking on fuel oil, the hoses should be disconnected and _____ 2372、加油后，拆卸软管时应将残油排到燃油舱，A. draped over the fantail to dry out B. drained over the side and washed out C. drained into the bilges and washed out D. drained into buckets or fuel tanks2373 To prevent the overflow of cargo tanks due to expansion, you should top off2373、加装燃油时，燃油舱应留有一定余量(１％—3％舱容)，供燃油膨胀． A. to the bottom of the expansion trunk B. to within 1% to 3 % of its capacity C. to within 1 to 3 inches of its capacity D. 1 to 3 inches from top of the vent pipe2374 In order to release CO2 to the machinery spaces from a fixed fire extinguishing system, you must _____ 2374．向机舱施放二氧化碳时，首先应打开机舱控制阀，然后再打开二氧化碳释放阀． A. actuate an alarm and open the engine mom control valve B. actuate an alarm and open the engine room CO2 releasing valve C. open the engine room control valve and shut off engine room ventilation fans D. open the engine room control valve and then the CO2 releasing valve2375 Why is it important for fuel oil tanks not to be topped off at the inner bottom level when loading on a cold day?2375．冷天加装燃油时，燃油舱应留有一定余量(一般是1％—3％舱容)，供燃油膨胀 容易产生溢油。

A. Increased viscosity of the product needs higher loading pressure, which increases the chances of a spill. B. Air pockets may cause the fuel to bubble out of the ullage hole. C. The temperature rise of the fuel will cause an overflow. D. Fueling valve may become stuck closed and cause the fuel oil to spill before the valve can be opened. 2372 D 2373 B 2374 D 2375 C2376During fueling operations, which of the listed precautions should be taken when 2377 topping off fuel tanks?2376．加油期间，当油舱接近满舱时，应降低泵速。

以免加油管产生过高压力：同时应测量油位以防发生溢油A. Reduce the pumping rate by closing the deck filling valve. B. Close all overflow valves. C. Place 5 gallon containers under all flange connections in the fuel line. D. Reduce the pumping rate and sound tanks frequently as the level rises.2377 The most critical part of the bunkering operations, which can result in an oil spill, is when the _____ 2377．加油期间，当油舱接近满舱时，最容易发生溢汕 A. hose joints are made up B. tanks are being topped off C. system is being lined up D. pumping operation is first started2378 After fuel tanks have been topped off, which of the listed procedures should be followed next?2378。

燃油舱加油结束后，应测量油位，确保油位不再升高 A. The pressure-vacuum relief valve should be reset. B. The tanks should be made seaworthy to prevent contamination. C. The tanks should be sounded to make sure the levels are not rising. D. The tanks should be marked with a bull stamp on the manifold filling valve 2376 D 2377 B 2378 C 2379If the overflow tank high-level alarm sounds while the fuel oil tanks are being topped 2380 off, the engineer should _____ 2379．当油舱接近满舱时，发生油位高位警报，应停止泵油操作。

A. close the static leg filling valve B. close the overflow tank filling valve C. reduce the fuel oil pumping rate D. stop the fuel oil pumping operation2380 The amount of expansion space to be left in a fuel tank when fuel oil is being received, is determined by the _____ 2380．燃油舱应留有一定余量，余量大小取决于加装的燃油温度A. quantity of fuel to be received B. flash point of the fuel as it is received C. fuel temperature as it is received D. viscosity of the fuel being received2381 The fire extinguishing action of C02 comes mostly from _____ 2381．二氧化碳是通过窒息作用来灭火的。

A. breaking the fire chemical chain reaction B. smothering C. cooling D. isolating the heat from the fuel2382 The lengthening of a crack formed in the shell plating of a ship may be prevented by _____ 2382．船体钢板上的裂纹，可通过在裂纹两端各钻一个孔来防止裂纹进一步扩展 A. welding brackets across both ends of the crack B. chipping out and slot welding the entire crack C. drilling a hole at each end of the crack D. cutting a square notch at each end of the crack 2379 D 2380 C 2381 B 2382 C 2383 Portable carbon dioxide fire extinguishers should be sent ashore to be recharged _____ 2383．对于二氧化碳灭火器，应每年称重，当重量减少10％时，应重新充注介质、A. when the remaining charge volume is less than 90 percent of the required VOLUME B. at each inspection for certification C. at each annual inspection D. when the weight loss exceeds 10% of weight of charge2384 Waste oil from the lube oil sumps of machinery may NOT be _____ 2384．油底壳的废油不能排到舱底。

A. drained into the vessel's bilges B. reclaimed for other uses C. held in a slop tank D. purified and then reused2385 Bilges may be pumped _____ 2385．舱底水可以通过油水分离器排到舷外 A. on the outgoing tide B. overboard after dark C. overboard through an oily water separator D. anytime in an emergency, i.e. main engine lube oil failure2386Following a grounding, you can best determine that a SLACK fuel oil tank has been holed by 2387 _____ 2386．船舶搁浅后，要判断一个燃油舱室是否进水，可以通过测量油位来判断。

A. sounding the tank B. waiting for the vessel to list C. examining tank boundaries D. checking fuel oil strainers 2383 D 2384 A 2385 C 2386 A 2387Your vessel has nm aground and upon taking fuel oil tank soundings, you find that a 2388 fuel tank level has increased. You therefore should suspect _____ 2387．船舶搁浅后，要判断一个燃油舱室是否进水，可以通过测量油位来判断如果油位升高，就可确定油舱产生了裂纹A. condensation in the fuel tank B. a crack in the hull portion of the fuel tank C. a load of bad fuel D. contamination from the saltwater flushing system2388 The device used for preventing the passage of flames into enclosed spaces is called a _____ 2388．用来阻止火焰进人封闭舱室的没备?稠；为火焰消除器。

A. flame relief valve B. flame stopper C. safety valve D. flame arrester2389At the earliest indication of fire aboard your vessel, you must FIRST _____ 2389．发现船舶出现火灾征兆的第一时间，应首先拉响警报 A. locate the fire B. determine which type of fire is burning C. sound the alarm D. fight the fire2390 A new ocean going ship of 2000 gross tons having an inoperative oily water separator may dispose of its bilge slops by _____ 2390．新建造的2000总吨远洋船舶，如果油水分离器不能正常使用，舱底污水应保留在船上，到港后排到岸上接收设施。

A. holding its slops onboard until they can be pumped into the city sewer system B. circulating them through the lube oil purifier to remove water and debris C. holding its slops onboard until they can be discharged to a shore side reception facility D. pumping them into a settling tank for separation before pumping the oily water residue overboard 2387 B 2388 D 2389 C 2390 C2391 Which of the following statements represents the correct action to take when three crew members discover a fire? 2391．当船上有三个人发现火灾后，一个人报告，一个人灭火，另一个人封锁现场。

A. One man report the fire, and the other two men fight the fire. B. One man report the fire, one man fight the fire, and one man evacuate and secure the area. C. One man report the fire, one man fight the fire, and one man act as a safety observer. D. All three men fight the fire and report it immediately after it is extinguished.2392 A fireman's outfit carried onboard cargo vessels, must have a _____ 2392货船上消防员装备应包括自带式的呼吸面具 A. canister-type gas mask B. fresh-air breathing apparatus C. self-contained breathing apparatus D. combustible gas indicator2393An oceangoing ship of 400 gross tons and above must be fitted with a standard discharge shore connection. What is the size of the bolt circle diameter of the shore connection required to transfer oily ballast to a shore si'de reception facility?2393．400总吨及以上的远洋船舶，应具有标准通岸排放接头，该接头的圆周直径是183mm。

A. 125 mm B. 183 mm C. 215 mm D. It depends on outside pipe diameter. 2391 B 2392 C 2393 B 2394While on watch in the engine room, you hear a continuo~ sounding of the general Mann. Which of the following actions should you take FIRST?2394．当在机舱值班时，如果听到警报器连续警报，应启动消防泵向消防总管供水 A. Secure the burners then proceed to your assigned boat station B. Start the fire pump and establish flow to the fire main C. Open the guardian valve and standby to maneuver D. Open the master control valves on the fixed CO2 system 21395 While on watch in the engine room, you hear a continuous sounding of the general alarm. Which of the following actions should you take?2395．当在机舱值班时，如果听到警报器连续警报，应启动消防泵向消防总管供水。

A. Make an entry in the official logbook B. Open the master control valves on the fixed CO2 system C. Start the fire pump and cheek discharge pressure D. Secure auxiliary condenser overboard discharge 2396 As soon as you hear the fire and emergency signal, you should ensure that the _____ 2396．一听到火警应急信号，应确保启动消防泵c A. ring buoys are thrown overboard B. engines are stopped C. fire pumps are started D. life preservers have been issued to everyone 2397 Which of the following actions should be taken by the engine room watch when the general alarm is sounded continuously?2397．当在机舱值班时，如果听到警报器连续警报，应启动消防泵向消防总管供水。

A. The fire pump should be started. B. The boiler fires should be secured. C. The fixed CO2 system should be initiated into action. D. The engine room ventilation should be secured. 2394. B 2395 C 2396 C 2397 A 2398 When the general alarm is sounded continuously, the engine room personnel should _____ 2398．当在机舱值班时，如果听到警报器连续警报，应启动消防泵向消防总管供水A. proceed to their man overboard stations B. start the fire pump C. put on lifejackets and go to their abandon ship stations D. secure the propulsion diesel engines and evacuate the engine room 2399 Which of the actions listed should be taken by the engineer on watch when the general alarm is sounded continuously for 10 seconds?2399．当在机舱值班时，如果听到警报器连续警报10s，应启动消防泵向消防总管供水。

A. Engine room ventilation should be started. B. Main engines should be secured. C. The fire pump should be started. D. The fixed CO2 system should be activated. 2400 As soon as you hear the fire and emergency signal, you should ensure that _____ 2400．一听到火警应急信号，应确保酋先启动消防泵 A. the ring buoys are thrown overboard B. the engines are stopped C. the fire pumps are started D. everyone is suited in an approved life preserver 2398 B 2399 C 2400 C2401The term "oil", as used in the Pollution Prevention Regulations , _____ 2402 2401．油污规则中术语“油”，指的是任何种类的石油产品。

2403 A. fuel oil only B. crude oil only C. liquefied petroleum gas D. petroleum oil of any kind 2402 The term "oily mixture", as defined in the Pollution Prevention Regulations includes _____ 2402．油污规则中术语“油类混合物”，指的是油渣或含油压载水或舱底污水 A. sludge B. oily ballast water C. bilge slops D. All of the above 2403 An oxygen indicator will detect _____ 2403．氧指示仪可用来检测室内氧气浓度A. concentrations of explosive gas B. an oxygen deficiency in a space C. the presence of harmful amounts of carbon monoxide D. All of the above 2404 To determine that a compartment contains sufficient oxygen to sustain life, you should use a/an _____ 2404．见上题。

A. explosives B. oxygen indicator C. fresh air indicator D. All of the above2405 Which of the following liquids can ordinarily be discharged overboard without being processed through an oily water separator?2405．专用压载舱内的压载水可不经过油水分离器直接排放， A. Cargo tank ballast. B. Segregated ballast. C. Engine room bilges. D. Cargo pump room bilges. 2401 D 2402 D 2403 B 2404 B 2405 B406An International Oil Pollution Prevention Certificate (IOPP) for a "new" 407 vessel ceases to be valid if _____ 2406．新建船舶的ＩOPP证书，如果更换船旗国，将失效： A. it exceeds 3 years from date of issue B. an alteration approved by the Captain of the Port is made C. an intermediate survey has not be conducted within 12 months from the date that the IOPP was issued D. the vessel is transferred to the flag of another country 2407 If fuel tank levels are found to have increased after a grounding, you should suspect _____ 2407．船舶搁浅后，可以通过测量油位来判断是否进水。

如果油位升高，就可确定船体产生了穿孔、裂纹A. a damaged numerator line B. a puncture, crack, or hole in the skin of the vessel C. improper record keeping of fuel transfer activities D. contamination of the contaminated steam supply system2408 The word "discharge" as used in Pollution Prevention Regulations applies to oil _____ 2408．油污规则中术语“排放”，指的是油“泄漏到航行水域”、“倾倒到航行水域”或“通过固定管系泵到航行水域” A. leaked into navigable waters B. poured into navigable waters C. pumped into navigable waters through a fixed piping system D. all of the above 2406 D 2407 B 2408 D2409What safety precautions should be observed by the crew while working around 2410 machinery in an engine room?在机舱内工作U；／，安全措施包括：穿安全鞋、戴耳朵保护设备、不戴首饰等。

A. They should wear safety shoes. B. They should wear ear protection. C. They should not wear jewelry. D. All of the above.2410 The explosive range of a mixture of flammable vapors is specified as a percentage of _____ 2410．可燃蒸汽的爆炸范围(上下限值)是以可燃蒸汽占空气的体积百分比来表示的A. flammable vapor by volume in air B. oxygen present to support combustion C. the temperature of the flash point D. the lower limit of explicability of the mixture2411 The trim of a vessel is the _____ 2411．船舶的吃水差(trim)表示船舶首，尾吃水的差： A. value of the mean draft B. degree of list C. amount of roll D. difference in fore and aft drafts2412 The order" _____ "means "Maximum maneuvering engine revolution for ahead propulsion."2412．车钟“全速前进”表示”主机以最大转速正车运行”。

A. Full Ahead B. Half Ahead C. Full Astern D. Half Astern 2409 D 2410 A 2411 D 2412 A2413 "Movement of engine no longer required." means" _____ ". 2413．“主机不再需要运转”表示车钟“完车” A. Stop Engine B. No Engine Revolutions C. Stand-by Engine D. Finished With Engine2414 The order"Bow thrust stop means _____ 2414．车钟“停首侧推器”表示“无首侧推器转速”A. Bow thrust full to port B. Bow thrust full to starboard C. No bow thrust revolutions D. No stern thrust revolutions2415For vessels with _____ , the meaning of the order would include the combination of pitch and revolutions as indicated in ship's orders.2415．对于装有凋距桨的船舶，车钟应包括主机的转速和螺旋桨的螺距。

A. fixed pitch propellers B. uncontrollable pitch propeller C. constant pitch propellers D. variable pitch propellers2416 After the order" _____ "is given, the air system is shut down, the turning gear put in, all drains and indicator cocks opened, and the cooling water and lubricating oil systems kept running.2416．“完车”今后，可切断空气系统，合上盘车机，打开示功考克，但是冷却水系统和滑油系统应继续运转一段时间 A. Stand-by Engine B. Stop Engine C. Finished With Engine D. Dead Slow Ahead2417 The value of GM still remains one meter, meanwhile we can pump the ballast water to _____ the ship on even keel. 2417．船舶的GＭ值(稳性高度)保持在lm，通过泵压载水能保持船舶平衡 A. make B. put C. keep D. get 2413 D 2414 C 2415 D 2416 C 2417 C2418 _____ , we kept removing the pistons. 2418．尽管时间很晚了，但是我们继续吊缸。

late　as　it was”为强调倒装，表示让步A. Late as it was B. As it was late C. Since it was late D. Because of its late2419 _____ thrust and resistance equal each other, the ship always travels at a constant speed.2419．只要船舶的推力与吼力们等，船舶将匀速前进 A. As long as B. As far as C. As well as D. Unless2420This scale of measurement is normally used for all readings and temperature values _____ dealing with theoretical calculations involving the gas laws.24212420．温度测量仪表一般都给出摄氏温度值但是在进行有关气体定律的理论计算时，不能采用摄氏温度值，而只能采用绝对温度。

2422 A. in addition to B. in addition that C. except that D. except when2421 The officer in charge of the engineering watch shall ensure that all machinery involved with the maneuvering of the ship can immediately be placed in the _____ of operation when notified that the ship is in congested waters.1.2421．值班轮机员应确保，当船舶航行在窄航道时与船舶操纵有关的所有机械都应处在手动操作式 A. manual mode B. automatic mode C. remote mode D. follow-up mode2422 The officer in charge of the engineering watch shall ensure that at all times bridge orders relating to changes in _____ of operation are immediately implemented.1.2422．值班轮机员应确保在任何时候驾驶台有关变速变向的命令迅速地进行。

一舷的30° A. ahead or astern B. fore or aft C. up or down D. speed or direction2423Engine room fires have been started by neglected oil leaks dripping on to hot pipes or exhaust manifolds _____ insulation has not been replaced after maintenance. 1.2423．在机舱内，如果漏汕滴到高温的管子或排气总管(维修后其绝热层未经更换)，便为发生火灾2. A. which B. when C. whose D. what3. 2418 A 2419 A 2420 D 2421 A 2422 D 2423 C 2424The main steering gear must be able to steer the ship at maximum ahead service speed and be capable at this speed, and at the ship's deepest service draught, of putting the rudder from 35 degrees on one side to 30 degrees on the other side within no _____ 2425 2424．对于主操舵装置，应能在不超过28s的时间内，将舵从一舷的35°转到另一舷的30°。

2426A. more than 28 seconds B. more than 60 seconds C. less than 28 seconds D. less than 60 seconds2425 The auxiliary steering gear must be capable of being brought speedily into operation and be able to put the rudder over from 15 degrees on one side to 15 degrees on the other side in no more than _____ with the ship at its deepest service draught and running ahead at the greater of one half of the maximum service speed or1.2425．对于辅操舵装置，应能在不超过60s的时间内，将舵从一舷的15°转到另一舷的15°。

2.A. 28 seconds/7 knots B. 28 seconds/14 knots C. 60 seconds/7 knots D. 60 seconds/14 knots 2426 The Port Authorities, in accordance with the IMO resolutions have .been carrying out _____ to enhance safety of ships.1.2426．港口国当局，按照IMO决议的要求，对船舶实施PSC检查以加强船舶安全 A. CPP B. FPP C. PSC D. FSC 2424 A 2425 C 2426 C2427To ensure the safe operation of each ship and to provide a link between the2428 Company and those on board, every Company, as appropriate, should designate a person or persons ashore having direct _____ to the highest level of management. 2427．为保证各船的安全运行和为公司与船上人员之间提供一个联系渠道，公司应根据情况指定一名或数名同最高管理层联系的岸上人员。

A. space B. distance C. visibility D. access2428 When making entries in the Oil Record Book, the date, operational code and item number shall be inserted in the appropriate columns and the required particulars shall be recorded _____ in the blank spaces.2428．填写《油类记录簿》时；日期、作业代码和项目编号记录到相应的表格内，所要求的细节应按年月顺序记人到空栏中A. periodically B. occasionally C. chronologically D. additionally2429 _____ shall be provided to every oil tanker of 150 tons gross tonnage and above to record relevant machinery space and cargo/ballast operations.2429．MARＰＯL公约规定，150总吨及以上的油轮配备《油类记录簿》第一部分(有关机器处所的操作)和第二部分(货油的操作)。

A. Oil Record Book Part I B. Oil Record Book Part II C. Oil Record Book Part I or Part II D. Oil Record Book Part I and Part II 2427 D 2428 C 2429 D  2430 The core item in the Oil Record Book Part I is _____ , and its main content is _____ 2430．《油类记录簿》第一部分(有关机器处所的操作)中，核心项目是C项，其内容是“残油的处理” A. Item A/BAIJ,AST OR CLEANING OF FUEL OIL TANKS B. Item B/DISCHARGE OF DIRTY BAIJ,AST OR CLEANING WATER FROM FUEL OIL TANKS REFERRED TO UNDER SECTION (A) C. Item C/DISPOSAL OF OIL RESIDUES(SLUDGE) D. Item H/BUNKERING OF FUEL OIL 2431 Duties shall be so organized by the chief engineer officer that the first watch at the commencement of a voyage and the subsequent relieving watches are _____ and otherwise fit for duty.2431．轮机长组织的值班安排应确保值班开始的第一班以及随后各班都经过充分的休息并适合于职责。

A. well trained B. in good luck C. in good health D. sufficiently rested 2430 C 2431 D 2432 All engineer officers and engine room ratings shall be aware of the serious 2433 effects of operational or accidental pollution of the marine environment and shall take all possible _____ to prevent such pollution, particularly within the framework of relevant international and port regulations. 2432．所有轮机员以及轮机部的其他人员都应意识到由于海洋环境污染带来的严重后果，并应采取一切可能的预防措施来防止此类污染事故的发生。

A. steps B. procedures C. precautions D. programs2433 Deficiencies in the categories of Life-saving, Safety in General, Fire-fighting Appliances and Load Line _____ approximately 66 % of all deficiencies.2433．在PSC检查中，在救生、安全设备、消防设备和载重线等四方面出现的缺陷占总缺陷的比例大约是66％A. account as B. account for C. account to D. account of2434If you must enter a room or compartment to combat the fire , keep an escape path _____ 2434．如果进入到一个舱室灭火，应保持一个脱险通道开启 A. open B. close C. opens D. closes2435 Upon the completion of required tests, a _____ should be placed on each extinguisher, showing the date and the person who completed the tests.2435．灭火器试验后，应放置标签，表注试验日期和试验人员。

A. cap B. disc C. tag D. cover 2432 C 2433 B 2434 A 2435 C2436A combination combustible gas and oxygen indicator is an instrument that 2437 measures the _____ of both combustible gas and oxygen; each is indicated on a separate meter. 2436．组合式可燃气体／氧气指示仪可以同时测量可燃气体、氧气的浓度，分别在各自的表上显示 A. purities B. combinations C. concentrations D. filters2437 _____ is the temperature at which a liquid fuel gives off sufficient vapor to form an ignitable mixture near its surface.2437．在闪点温度下，液态燃油散发足够的蒸汽在其表面附近形成可燃混合物。

A. Setting point B. Dew point C. Flash point D. Lean point2438 When considering the lowest fuel system operating temperature, _____ are important.2438．浊点和倾点是燃油低温流动性的指标A. specific gravity or relative density B. open flash point and closed flash point values C. higher calorific and lower calorific values D. cloud point and pour point values 2439 Out of the many hazards that can occur on ships, fire is by far the most frequent, and _____ more total losses than any other casualty.2439．船舶上发生的危险情况中，火灾最为常见，而且它比其他任何灾害造成更大的损失 A. due to B. owing to C. results from D. results in 2436 C 2437 C 2438 D 2439 D2440Cylinder oil is a high viscosity mineral oil, with a _____ machined to the anticipated sulfur content of the fuel.2441 2440．气缸油是一种高粘度的矿物油，往往具有与燃油硫分相一致的TBN(总碱值)。

2442 A. TAN B. TBN C. SAN D. SBN2441 The specific gravity of fuel oil is a _____ 1.2441．燃油的比重是相对值2. A. absolute value B. relative value C. constant value D. set value2442 The higher the cetane number, _____ the ignition quality of the fuel.1.2442．十六烷值越高，燃油的自燃性能就越好2. A. the worse B. the better C. the smaller D. the greater2443 Obviously, for a given fuel oil, its pour point is _____ its cloud point.1.2443．对于给定的燃油，其倾点低于浊点。

2. A. lower than B. higher than C. as same as D. better than2444 The _____ o fan oil refers to its ability to mix with water and then release the water in a centrifuge.1.2444·油的抗乳化性是指与水混合并释放水分的能力 A. oxidation resistance B. carbon-forming tendency C. remissibility D. acidity2445 Any carbon built up on surfaces must be washed away by _____ additives and held in suspension by a _____ additive. 2445．具有清洁作用的添加剂用来清除表面积炭，而分散剂用来让油分散。

A. dispersant/detergent B. detergent/dispersant C. dispersant/dispersant D. detergent/detergent 2440 B 2441 B 2442 B 2443 A 2444 C 2445 B2446As for turbine oil, contact with water in the form of steam will be inevitable 2447 so good _____ properties will be essential.2446．对于透平油，因为要与水蒸汽接触，因此必须具有良好的抗乳化性能A. defrosting B. de-oiling C. demulsifying D. dehumidifying2447 The cylinder oil will have to neutralize the acidic products of combustion and have good _____ properties to keep the metal surfaces clean.2447．具有清洁作用的添加剂用来保持金属表面清洁。

A. detergent B. de-oiling C. defrosting D. demulsifying2448 It is often necessary to put an engine into _____ service with one or more cylinders cut out, or with a turbocharger secured.2448．对于发动机来说，停一个(多个)气缸(封缸)或停增压器运行，都是临时性措施 A. additional B. permanent C. temporary D. long2449 If liquid refrigerant accidentally comes in contact with the eyes, _____ immediately. 2449．如果液体制冷剂进入到眼睛，应接受医疗 A. rub the eyes B. irritate the eyes C. wash the eyes with a heavy boric acid solution D. obtain medical help 2446 C 2447 A 2448 C 2449 D2450 Should a person be overcome due to lack of oxygen and high concentration of refrigerant, treat with _____ 2450．如果人员呼人高浓度的制冷剂而缺氧，应对其进行人工乎吸。

A. fresh water B. fresh air C. salt water D. artificial respiration2451 Which of the following operations need NOT to be entered on the Oil Record Book Part I? ① Routine discharge at sea of bilge water containing oil from the machinery spaces through strainers. ② Bunkering of fuel oil.2451．“机器处所含油舱底水通过滤器排放”、“燃油的加装”，这两项操作都应记录到《油类记录簿》A. ① only B. ② only C. both ① and ② D. neither ① nor ②2452 Which of the following operations need NOT to be entered on the Oil Record Book Part I？ ① Disposal of oil residues. ② Internal transfer of fuel oil2452．“残油的处理”应记录到《油类记录簿》；而“燃油的内部驳运”不需要记录到《油类记录簿》。

A. ① only B. ② only C. both ① and ② D. neither ① nor ②2453 Which of the following operations need to be entered on the Oil Record Book Part I? ① Cleaning of fuel oil tanks. ② Internal transfer of fuel oil2453．“燃油舱的清洁”应记录到《油类记录簿》；而“燃汕的内部驳运”不需要记录到《汕类记录簿》A. ① only B. ② only C. both ① and ② D. neither ① nor ② 2454 Which of the following operations need to be entered on the Oil Record Book Part I？. ① Ballast of fuel oil tanks. ② Condition of oil discharge monitoring and control system.2454．“燃油舱的压载”和“排油监视系统的状况”都应记录到《油类记录簿》。

A. ① only B. ② only C. both ① and ② D. neither ① nor ② 2450 D 2451 D 2452 B 2453 A 2454 C2455Enhanced procedures concerning the exercise of _____ have been developed to allow intervention in the case of deficiencies deemed to pose a danger to persons, property or the environment. 2455．港口国当局，按照IMO决议的要求，对船舶实施PSC检查以加强船舶安全和防止海洋污染A. port state control B. flag state control C. fire and boat drill D. safety inspection2456 With reference to rules governing steering gear, which one of the following roles is incorrect?2456．有关舵机的规则规定，客船上的辅助舵机必须是动力驱动的。

A. It is required that all ships are provided with two independent steering gear systems that is one main and one auxiliary. B. The auxiliary gear could be power operated in passenger ships. C. The auxiliary gear must be of adequate strength and sufficient to steer a ship at navigable speed. D. All moving parts of the steering gear must be guarded against any possible damage.2457 The Oil Record Book, as a part of the ship's official logbook, shall be kept on board and preserved for a period of _____ 2457．《油类记录簿》用完后应至少留船保持3年。

A. 3 years after making the first entry B. 2 years after the last entry C. 3 months after last entry D. S years after the last entry 2455 A 2456 B 2457 D2458 At an unsheltered anchorage the chief engineer officer shall consult with whether or not to maintain an underway watch. _____ 2458．在开敞锚地，轮机长应与船长协商，是否仍保持航行值班 A. the engineer officer in charge of watch B. the deck officer in charge of watch C. the master D. the chief mate 2459 In some cases facilities may be provided for emergency overriding oil pressure shutdown, if this facility is used, adequate warning must be given to _____ 2459．在一些情况下，安装了油压超高应急停车装置，此时，应向轮机部人员提供足够的警告。

A. the bridge watch-keeper B. the captain C. the chief engineer D. the engine room staff 2460 With UMS, when the engine room is unwatched, _____ will control the main engine.2460．对于无人机舱，值班驾驶员来控制主机 A. the bridge officer on watch B. the chief engineer C. the duty engineer D. the duty motorman 2458 C 2459 D 2460 A2461The SMS should provide for _____ ensuring that the company's organization 2462 can respond at any time to hazards, accidents and emergency situation involving its ships.2461．SMS应规定具体措施，确保公司机构能在任何时候对涉及其船舶的危险、事故和紧急情况作出反应。

A. measures B. progresses C. members D. programs2462The Company should ensure that _____ documents are promptly removed.2462，公司应保证过期的文件应迅速清除 A. absolute B. obsolete C. updated D. new2463 The Company should ensure that _____ involved in the Company's SMS have an adequate understanding of relevant rules, regulations, codes and guidelines.2463．公司应保证与公司有关的所有人员对有关规范、规则和指南有充分的了解A. masters B. chief engineers C. crew D. personnel2464 STCW78/95 Convention describes that _____ are laid down for the certification of engineer officers in charge of a watch in a traditionally manned engine room, or the designated engineer in a periodically unmanned engine room.2464．STCW78／95规定的是有关船员培训、发证和值班的强制性最低要求。

A. available minimum requirements B. available maximum requirements C. mandatory minimum requirements D. mandatory maximum requirements 2481 A 2482 B 2463 D 2464 C2465 _____ should not undertake any task which will interfere with the supervision duties relating to the main machinery and associated equipment. 2465．值班人员不能进行那些影响他对主推进装置及其附属设备监视职责的工作A. The watch keeping personnel B. The chief engineer C. The person on a bunker barge D. The duty deck officer2466According to the international regulations concerning the prevention of 2467 pollution of sea areas from ships, the disposal IMO the sea of all plastics is _____ 2466．MARPOL公约规定，一切塑料制品禁止倾倒人海：A. welcome B. admitted in some special sea areas C. prohibited D. acceptable2467 The SMS should provide for specific measures aimed at promoting the reliability of equipment or systems _____ may result in hazardous situations.2467．“安全管理体系”应明确那些应突发性操作失灵会导致险情的设备和系统，SMS应规 定旨在提高这些设备或系统可靠性的具体措施， A. which the sudden operational failure B. that the sudden operational failure C. the sudden operational failure D. the sudden operational failure of which 2465 A 2466 C 2487 D 2468 The Company should establish in the SMS that _____ has the overriding authority and the responsibility to make decisions with respect to safety and pollution prevention. 2468．公司应保证在船上实施的SMS中包含一个强调船长权限的明确说明。

A. the master B. the chief engineer C. the officer on duty D. the engineer in charge of watch2469 Administrations should bear in mind the significance of _____ in maintaining safety of life and property at sea and in preventing marine pollution.2469．主管机关应牢记在保持海上人命、财产安全和防止海洋污染方面，通信和语言技能 的重要意义 A. communication and language skills B. emergency equipment C. advanced performance of main engine D. advanced nautical equipment2470 Under the provisions of applicable international conventions, ships entitled to fly the flag of a Party are subject, while in the port of a Party, to control by officers duly authorized by the Party. Ships of non-parties or below convention size shall be given _____ 2470．IMO有关PSC检查的公约中规定，对于非缔约国和低于公约适用长度的船舶，采取 所谓的“不优惠待遇”。

A. more favorable treatment B. less favorable treatment C. no more favorable treatment D. the most favorable treatment 2468 A 2469 A 2470 C2471If the PSCO from general impressions or observations on board has _____ for believing that the ship, its equipment or its crew do not substantially meet the requirements, the PSCO should proceed to a more detailed inspection. 2471．根据PSCO(PSC检查官)的：总体印象和观察，有明显理由认为船舶、设备或船员不能满足要求，可执行更详细检查A. clean report B. serious deficiencies C. clear grounds D. detention report 2472 The port state control inspection is carried out on the basis of the following international conventions. Among them, which one was not set by IMO?2472．ILONo．147，即“商船运输最低标准公约”，是山国际劳工组织制定的。

A. 1J66 B.ITC 69 C. ILO No. 147 D. SOLAS 74 2473 The SOLAS Convention in its successive forms is generally regarded as the most important of all international treaties concerning the _____ of merchant ships.2473．SOLAS是有关海上人命安全的公约A. pollution B. economization C. safety D. efficiency2474 Annex IV of MARPOL 73/78 contains regulations for the prevention of _____ 2474MA~L73／78附则Ⅳ是有关生活污水排放的规定 A. pollution by oil B. pollution by noxious liquid substances carried in bulk C. pollution by sewage from ships D. pollution by garbage from ships 2471 C 2472 C 2473 C 2474 C 2475 The main objective of the SOLAS Convention is to specify _____ for the construction, equipment and operation of ships, compatible their safety.2475．SOLAS公约的主要目的是为贡明确有关船舶建造、设备和运行能符合安全性的最低标准。

A. at most references B. at least references C. maximum standards D. minimum standards2476To maintain the clown stream pressure within defined limits over a range of flow and despite any changes in supply pressure, _____ is fitted.2476．为了在超过流量范围时，保持顺流压力在一定限制值之内，而且不受供应管压力的变化，安装了减压阀 A. a check valve B. a gate valve C. a pressure reducing valve D. a quick closing valve2477 A _____ sometimes called filters, is a device designed to prevent the passage of unwanted solids into the system. 2477．“stainer”和“filter"都是滤器，但严格地说，前者是粗滤器，后者是细滤器，但是它们都能阻止外界颗粒进入到系统。

A. steam trap B. check valve C. separator D. strainer2478 Auxiliary machinery covers everything onboard except _____ 2478，船舶辅助机械指的是除了主机和主锅炉外的所有机械 A. main engines B. main boilers C. pipes and fittings D. A and B2479 In motorships there are two main circuits, _____ 2479．在内燃机船上，有两个主要的循环系统，即淡水系统和海水系统 A. one salt water, one fresh water B. one salt water, one fuel C. one fresh water, one fuel D. one steam, one fuel 2475 D 2476 C 2477 D 2478 D 2479 A2480 In motor-ships, _____ , after passing through main and motion bearings and oil cooled pistons, etc. is either retained in the bedplate. 24812480．在内燃机船上，滑油经过主轴承和其他轴承以及油冷活塞后，回流到机座的油底壳 内。

2482A. the fuel oil B. the lubricating oil C. the refrigerating oil D. the hydraulic oil2481 Two main lubricating oil pumps are usual and are obligatory in _____ 1.2481．船上通常有两台主润滑油泵，但在客轮上是强制性的2.A. container ships B. bulk carriers C. passenger ships D. barges2482 Starting air for auxiliary engines may be taken directly from the main reservoirs or through _____ 1.2482．发电柴油机的启动空气可直接来自于主空气瓶，也可来自于辅空气瓶2.A. an auxiliary reservoir B. a controlling air bottle C. an emergency air compressor D. a main air compressor2483An auxiliary reservoir for starting auxiliary engines should be kept at _____1.2483．用于启动发电柴油机的辅空气瓶，在任何时候，都应保持在最大压力。

2. A. low pressure at all times B. full pressure at all times C. low pressure at intermittence D. full pressure at intermittence 2480 B 2481 C 2482 A 2483 B2484The minimum number and capacity of bilge pumps and fire pumps and their dispersment within the ship is governed by _____ 2484．船上舱底水泵和消防泵的最少数量、排量以及布置应同时满足船级社的规范、船汁国的要求和SOLAS公约的有关要求 ’ A. Classification Society Rules B. National requirements C. The IMO International Convention for the Safety of Life at Sea D. All of the above 2485 The fire pumps must be capable of delivering a total quantity of water at a defined head , not less than _____ of the total bilge pumping capacity.2485．消防泵应能在一定的压头下以最大排量工作，排量不得少于舱底泵系总容量的2／3A. one-third B. two-thirds C. one-fourth D. two-fourths 2486 An emergency bilge pumping system is provided and should be _____ of the main bilge pumping system, according to the SOLAS 74 Convention.2486．SOLAS公约规定，应急舱底水泵系应与主舱底水泵系独立。

A. dependent B. independent C. in series D. in parallel 2487 When a point rotates about an axis and, at the same time, moves parallel to that axis, it describes _____ 2487．如果某一点绕轴旋转，同时沿该轴平行线移动，则产生螺旋线 A. a line B. a circle C. a helix D. an epllicate 2484 D 2485 B 2486 B 2487 C2488If a line at right angles to the axis rotates ~t that axis and, at the same time, 2489 moves parallel to the axis, it will generate _____ 2488．．如果与轴成一定角度的某一线绕轴旋转，同时沿该轴平行线移动，则产生螺旋面。

如果与轴成一定角度的某一线绕轴旋转，同时沿该轴平行线移动，则产生螺旋面A. a helix B. a helicoidal C. a curve D. a cone2489 If the pitch of a propeller is constant throughout the length and breadth of the blade, it is said to be of _____ 2489．如果螺旋桨的螺距在桨叶的长度方向和宽度方向是常数，则该螺旋桨具有等螺距．如果螺旋桨的螺距在桨叶的长度方向和宽度方向是常数，则该螺旋桨具有等螺距 A. constant pitch B. variable pitch C. uniform pitch D. non-uniform pitch2490If the pitch varies radially or circumferentially , the propeller is said to be of _____ 2490．如果螺旋桨的螺距在桨叶的长度方向和宽度方向是变化的，则该螺旋桨具有不等螺距。

．如果螺旋桨的螺距在桨叶的长度方向和宽度方向是变化的，则该螺旋桨具有不等螺距 1. A. constant pitch B. variable pitch C. uniform pitch D. non-uniform pitch2491 The pitch ratio of a propeller is the mean pitch divided by _____ 2491．螺旋桨的螺距比是指螺旋桨的平均螺距与其直径之比．螺旋桨的螺距比是指螺旋桨的平均螺距与其直径之比 A. the propeller diameter B. the propeller radius C. the pitch angle D. the length of helix2492 When viewed from astern, if the propeller revolves in a clockwise direction when going ahead, it is known as _____ 2492．从船尾方向看，正转时顺时针旋转的螺旋桨，称为右螺旋桨。

．从船尾方向看，正转时顺时针旋转的螺旋桨，称为右螺旋桨 A. ahead direction B. astern direction C. right-handed D. left-handed 2488 B 2489 C 2490 D 2491 A 2492 C2493Wake varies considerably with the form of the vessel, but , generally speaking, the bluffer the ship _____ the wake value.2493．船舶产生的兴波与船舶形态有很大关系一般地说，船舶的流线型越差，产生的兴波值就越大 A. the higher B. the lower C. the faster D. the slower2494 In moving forward, a ship imparts forward motion to the water at the sterns this is known as _____ 2494．船舶前进时，使尾部的水产生向前运动，这就是所谓的“兴波”。

A. the speed of the vessel B. the speed of the propeller C. the wake D. the wake fraction2495 A propeller of 5.65m in diameter, having a mean pitch of 4.88m, turning at 72rpm, at a speed of 11 knots (339.79m/min), will give _____ of apparent slip.2495．滑失比=(螺距X转速—进速)／(螺距X转速)，式中，，螺距=4．88m：转速：72q．)n，二1．2r／s；进速=339．79m／rain=5．663,n／s计算得滑失比=0．033 A. 0.967 B. 0.033 C. 0.031 D. 0.9692496 A (n) _____ is a chemical or electro-chemical attack on the metal surface which may be further increased if the sea-water is polluted.2496．“腐蚀”是指在金属表面产生化学或电化学作用，如果与海水接触，腐蚀作用将加剧 A. errosion B. corrosion C. cavity D. scouring 2493 A 2494 C 2495 B 2496 B 2497 A(n) _____ is a mechanical attack on the metal surface which may be due to a disturbance in the flow of the water over the blade of the propeller. 2497．“剥蚀”是指由于在螺旋桨叶的水流扰动而在金属表面产生的机械作用。

A. erosion B. corrosion C. pitting D. dezincification2498Due to the large amount of heat picked up by the air in boiler and engine rooms, 2499 it would be _____ to maintain ambient conditions within the comfort zone by air conditioning .2498．由于在机炉舱中空气含有大量热量，通过空凋使机炉舱内保持适宜的温度是不现实的 A. possible B. necessary C. practicable D. impracticable2499 Morring winches are often ~combined with _____ units so that one prime mover drives both.2499．绞缆机经常与锚机装置连用，这样一台原动机可用来驱动两台装置。

A. crane B. hatch cover C. windlass D. steering gear2500 The most common forms of main drive used on deck auxiliaries are _____ 2500．甲板机械的驱动装置有：蒸汽装置、电动机和液压机械 A, steam plants , electric motors and compressed air B. diesel engine, hydraulic machinery and compressed air C. steam plants, electric motors and hydraulic machinery D. diesel engines, steam plants and hydraulic machinery 2497 A 2498 D 2499 C 2500 C2501 Overload protection on hydraulic system is provided by the use of _____ 2501．液压系统通过使用压力释放阀来进行过载保护，A. stop valves B. pressure relief valves C. balance valves D. regulating speed valves2502 It is important with all hydraulic systems to ensure that interlocking arrangements provided for pump or motor control levers are _____ before the pump driving motor can be started.2502．对于所有的液压系统，必须确保在油泵马达启动前，马达控制仟的联锁装置处在中央位胃oA. in the port position B. in the starboard position C. in the neutral position D. to be dismantled2503 Which of the following hydraulic systems is not one of the three sub-division of the Hydraulic drive system?2503、液压系统包括定压、变量和定容积等三个子系统。

A. Constant pressure system B. Variable pressure system C. Variable displacement system D. Constant volume system2504 A variable displacement system of hydraulic drives consists of _____ 2504．变量液压系统是由变量轴向(或径向)柱塞泵来实现变量的 A. a variable displacement axial piston pump B. a constant displacement axial piston pump C. a reciprocating piston pump D. a centrifugal pump 2501 B 2502 C 2503 B 2504 A2505 Most anchor handling equipment incorporates _____ for mooring purposes. 2505．绝大多数起锚设备使用卷绕端来下锚的。

A. cable lifters B. spur wheels C. bollard D. warpends2506The duty of a deck winch is to lift and lower a load by means of a fixed rope on 2507 _____ 2506．起货机是通过在卷筒轴上钢丝绳来进行货物装卸的A. a warp end B. a mooring winch C. a worm gear D. a barrel 2507 Deck cranes require _____ time to prepare for working cargo than derricks.2507．就准备工作来说，克令吊比吊杆式起货机省时A. less B. more C. many D. much 2508 Some cranes are mounted in pairs on a common platform which can be rotated through 2508．克令吊能作360°回转。

A. 360 ° B. 270 ° C. 180 ° D. 90 ° 2509 _____ can be operated independently or locked together and operated as a twin-job cranes of double capacity.2509．两台克令吊能独立地工作，也能组合起来工作，产生双倍的起吊能力 A. Two derricks B. A derrick and a crane C. Two cranes D. A crane and a winch 2505 D 2506 D 2507 A 2508 A 2509 C 2510 A fire starts when the following _____ factors come together. 25l0．火灾发生的三个必要条件：可燃物、着火源和氧气A. combustible material B. ignition source C. oxygen D. A and B and C2511 Class A fires are best extinguished by quenching or cooling with _____ 2511．A类火灾最好通过使用喷水速冷或冷却来灭火。

A. deprival of oxygen B. a water spray C. soda-acid D. foam2512 Class B fires are best extinguished by smothering , i.e. _____ 2512，B类火灾最好通过窒息造成缺氧来灭火A. deprival of oxygen B. removal of heat C. spraying of water D. injecting of soda-acid2513 Class C fires are best extinguished by _____ 2513．C类火灾最好通过于粉灭火器来灭火 A. foam extinguishers B. water spray equipment C. dry powder extinguishers D. soda-acid extinguishers2514 The soda-acid portable extinguishers must be discharged and refilled _____ 2514．手提式碳酸氢钠一酸灭火器应每年施放掉并重新冲注。

A. every six months B. every year C. every one and half year D. every two years 2510 D 2511 B 2512 A 2513 C 2514 B 2515"Cast iron has poor corrosion resistance to sea water, especially in the presence of 2516 bronzes." implies _____ 2515．铸铁在与铜共存的情况下，受海水的腐蚀将更严重A. cast iron is a cheap material B. cast iron can pollute sea water C. cast iron has more corrosive than bronzes to sea water D. cast iron is more corrosive to sea water when it meets with bronzes 2516 Cast iron's weakness in tension and under shock loading limits its use to low pressure steam, air, oil and low speed water fittings. The above sentence , rr~st probably means _____ 2516．铸铁抗拉力和冲击力能力较差，因此铸铁件仅局限于在低压系统中使用。

A. cast iron has we&ness B. cast iron can stand up shock loading C. cast iron fittings are only suitable in low pressure situation D. cast iron fittings are not suitable in low pressure situation 2517 Seamless mild steel is used for steam (also copper for moderate pressure and temperature), h.p. air, feed discharge and all oil fuel pressure pipings. According to the above sentence, which of the following statements is not true?2517．无缝钢管适用于蒸汽管路、高压空气管路、排出管路和所有的燃油压力管路；而对于中等压力、温度的蒸汽管，采用铜管。

A. Both seamless mild steel and copper may be used for middle pressure steam. B. "h. p. air" means high pressure air. C. l'he feed piping of the boilers can be made of seamless mild steel. D. All oil pipings are made of mild steel. 2515 D 2516 C 2517 D2518 Wrought iron has an inherent resistance to corrosion but is not to be had freely , its place has been taken by the cuprous alloys. According to the above sentence , which of the following statements is true? 2518．熟铁抗腐蚀性好，但不易得到。

现在一般川亚铜合金来取代A. Wrought iron can resist liquids flow. B. It is difficult to attain the wrought iron. C. Wrought iron should be combined with cuprous alloys. D. The cuprous alloys have more disadvantages than wrought iron.2519 Cast iron and gunmetal fittings are used freely in small sizes at moderate pressure; large fit for high pressure and temperature are cast or mild steel. In the above sentence, the word "those" means _____ 2519．承受中等压力的小型管件使用铸铁和青铜作为材料；而承受高压高温的大型管件采用无缝钢作为材料。

显然，代词“those"指的是“large　fittings"A. cast iron fittings B. mild steel fittings C. small fittings D. large fittings2520Provision must be made in pipe systems for changes in length due to change of 2521 temperature. The bold and italic word "provision" probably means _____ 2520．管系中必须安装膨胀接头，以适应由于温度的变化而使管系长度发生的变化 A. flanges B. nuts C. expansion joints D. bolts 2518 B 2519 D 2520 C2521 Stainless steel is material commonly used for temperatures up to 500~C; beyond th~ and for severe corrosive conditions other materials are required. The bold and italic word "that" probably means _____ 2521．不锈钢可以在温度500℃场合下使用，当温度超过500℃时，为了适应更严重的腐蚀工况，需要使用其他材料。

A. stainless steel B. temperature C. 500~C D. other materials2522 Maximum and minimum working temperatures must be considered when choosing the joint, which must be so installed that it is neither over-compressed nor over-extended. The bold and italic word "which "probably means _____ 2522．选择膨胀接头时，应考虑最高工作温度和最低工作温度，膨胀接头既不能过度压缩也不能过度拉仲 A. maximum working temperature B. minimum working temperature C. the joint D. the insulating material2523 In usual marine applications, bellows joints are designed and fitted to accommodate straight- line axial movement only and the associated piping requires adequate anchors and guides toprevent misalignment. According to the above sentence, which of the following statements is true?2523．船用波纹管接头用来仅仅承受直线轴向移动，管系还需要支撑件和定向件来防止失中。

A. The marine bellows joints are attached in the accommodation only. B. The bellows joints should be attached to anchors. C. The associated piping should be thrown into the water like as anchors. D. The connecting piping with the joints should be fixed firmly. 2521 C 2522 C 2523 D 2524 Disastrous explosions have been caused by accumulations of oil or oil vapour in air lines not drained. According to the above sentence , which of the following statements is tree? 2524．空气管路中油或油蒸汽的积聚会产生严重的爆炸。

A. Oil vapour in air piping are dangerous. B. Explosion will cause oil vapouring in air lines. C. Oil vapour in air piping should be drained. D. Oil in air piping should not be drained.2525 It is usual to identify the fluids in pipes by bands of paint at intervals, and the engineer should familiarize himself with the code in use. According to the above sentence, which of the following statements is tree?2525为了区别管路中不同种类的流体，通常以一定的间隔在管子上涂上油漆环带 A. People can know the types of fluids in pipes by feeling with hands. B. There are series of rings painted in the pipes to show various fluids. C. Engineers should wear cards standing for ranks. D. Engineer knows his own code very well.2526 It should be apparent that little or nothing is gained by opening a drain at the same time as or after admitting steam. The above sentence probably means _____ 2526．应确保当蒸汽进入时或进入后，放残口没有任何异物。

A. There is apparent condensate in piping. B. The steam is not discovered after admitting steam. C. The condensate should be fully loaded in the piping as admitting steam. D. The condensate should be fully drained from the piping while admitting steam 2524 A 2525 B 2526 D 2527Cocks and valves control or interrupt flow, and have internal passages arranged so that they can be restricted or closed: in cocks, by rotating the plug, and in valves, by lowering, raising or rotating a disc in relation to a seating surface. According to the above sentence, which of the following statements is not true? 2527．考克和阀件用来控制或影响流体流动，它们具有能关小或关闭的内部流道。

对于考克，是通过旋转塞子来实现，而对于阀件，是通过升、降阀片或旋转阀片来实现A. Flows of fluids can be restricted by both. cocks and valves. B. There are seats in the internal passages of valves. C. A disc of valve only moves up and down. D. We can infer that there is a bore in cock plug. 2528 The globe valve has a bulbous body, housing a valve seat and screw down plug or disc arranged at fight angles to the axis of the pipe. According to the above sentence, which of the following statements is not true?2528。

球阀有一个球形体，里面有阀座和螺旋塞，螺旋塞与管子轴线成直角 A. 1'he profile of the valve is like a globe. B. The valve seat is set into the bulbous body. C. ~he plug or disc of the valve is made vertical to the axis of the pipe. D. The valve seat is located at right side of the plug or disc. 2527 C 2528 D2529Unlike the globe valve, gate valves give full bore flow without change of 2530 direction, such a valve is not suitable to partially open operation. According to the above sentence, which of the following statements is not true?2529．与球阀不同，门阀不需要改变方向就能全开，这种阀不能进行部分开启操作。

A. The globe valve may be suitable for partially open operation. B. The globe valve will give full bore flow with change of direction. C. The gate valve gives full bore flow with change of direction. D. The gate valve is suitable for full bore operation only. 2530 A butterfly valve consists basically of a disc pivoted across the bore of a ring body having the same radial dimensions as the pipe in which it is fitted. According to the above sentence, which of the following statements is not true?2530．蝶阀外貌是一个环形体，环形的直径与其安装的管子直径相同：蝶阀的开、关是通过旋转柱塞米实现的： A. The diameter of a disc is the same as the outer diameter of the pipe. B. We can infer that the valve is opened or closed by rotating the spindle. C. A butterfly valve comprises a disc and a ring body. D. The profile of the butterfly valve is a ring body. 2529 C 2530 A 2531 D 2531 A check valve is another name for _____ 2531．单向阀就是止回阀。

A. a test valve B. an inspection valve C. a stop valve D. a non-return valve2532To prevent accidents from occurring, special valve chests are used in such cases in which interchangeable blanks and connecting passages are incorporated. The bold and italic word "which" means _____ 2532．在这种情况下，为防止发生事故，采用了特殊的阀箱，该阀箱具有能互换的盲板和连接通道A. accidents B. special valve chests C. interchangeable blanks D. connecting passages2533 Most marine biological sewage treatment plants consist of all the following statements except _____ 2533．船上生活污水处理装置包括曝气室、沉淀室、消毒杀菌室和好氧菌等，不使用权用厌氧菌。

A. aeration tanks B. settling tanks C. disinfection agent D. anaerobic bacteria2534 In its simplest form the pressure reducing valve is opened or closed by _____ which is balanced by the downstream pressure acting on a diaphragm.2534．最简单形式的减压阀是由预紧的弹簧来开、关的，该弹簧由作用在膜片上的压力来保持平衡A. adjusting a nut B. a pre-tensioned spring C. any spring D. upstream pressure2535 A more sophisticated pressure reducing valve incorporates a pilot valve which controls the fluid above the valve operating piston in response to downstream pressure. The bold and italic word "which" means _____ 2535．较复杂的减压阀采用了一个导阀，该导阀根据膜片上的压力来控制柱塞上方的流体： A. a pressure reducing valve B. a pilot valve C. an operating piston D. downstream pressure2536 Fuel oil tanks must be fitted with _____ that can be closed rapidly and remotely in the event of an emergency such as a fire. 2536．燃油舱必须安装能进行遥控操作的速闭阀。

A. stop valves B. non-return valves C. quick closing valves D. relief valves2537 A(n) _____ is a special type of valve which prevents the passage of steam but allows condensate to pass.2537．阻汽器是一种特殊殊类型的阀，它能阻止蒸汽流动，但允许凝结液流过 A. check valve B. non-return valve C. steam trap D. quick closing trap2538 Strainers, sometimes called _____ , are devices designed to prevent the passage of unwanted solids into or further along a system.2538．“strainer"和"filter"都是滤器，但严格地说，前者是粗滤器，后者是细滤器，但是它们都 能阻止外界颗粒进入到系统。

A. dampers B. filters C. stopper circuits D. separators2539In many installations basket strainers consist of a cylindrical container in which a perforated metal or wire basket is suspended. The bold and italic word "which" means _____ 2539．笼式滤器是由一个圆柱形容器组成，在该容器内悬挂了有孔的金属笼 A. installations B. basket strainers C. a cylindrical container D. a metal or wire basket 2536 C 2537 C 2538 B 2539 C2540Lubricating oil systems are fitted with a wide variety of strainers some of2541 which can be cleaned in situ while others have replaceable cartridges. The bold and italic word "which" means _____2542 2540．滑油系统中安装了各利，形式的滤器，其中一些滤器可现场清洗，其他滤器具有可更换的芯件。

2543 A. lubricating oil B. lubricating oil systems C. strainers D. cartridges2541 A(n) _____ is a device which adds to the energy of a liquid or gas causing an increase in its pressure and a movement of the fluid.1.2541．增加液体或气体的能量，引起压力升高，并让流体移动的设备，是泵 A. pump B. engine C. turbine D. boiler2542 A simple pumping system consists of a suction branch, a pump and _____ 1.2542．简单的泵系有吸人支管、泵和排出支管组成2. A. a priming device B. a discharge branch C. a filter D. a suction valve2543 Every liquid has a pressure at which it will vaporize and this pressure varies with temperature The word "which" means _____ .2543．在一定的压力下，每一种液体都能蒸发，该压力随温度而变化。

A. a liquid B. a pressure C. a temperature D. none of the above 2540 C 2541 A 2542 B 2543 B2744 Some of the energy fed into the pump will be dissipated as _____ due to mechanical inefficiencies, the remainder will be converted into pressure rise and fluid velocity. 2544．输人到泵的一些热量，由于机械损失，以热能的形式散发了，剩余的能量转变为流体的压力能和动能A. hydraulic head B. static head C. heat energy D. steam2545Generally speaking, suction heads require to be _____ for high speed or large 2546 capacities than for low speed or small capacities.2545。

一般地说，高速或大排量时，泵的吸人压头比低速或小排量时要大A. greater B. smaller C. better D. worse2546Before liquid can flow into a pump, the air in the suction line must be _____ sufficiently to cause the liquid to flow into the suction chamber.2546为了确保流体能进入到泵的吸人腔室，吸人管路中的空气应排除A. filled B. evacuated C. compressed D. charged2547 The air reservoirs must have _____ fitted to prevent rupture in the event of fire.2547．空气瓶必须安装易熔塞，以防发生火灾时爆炸 A. high pressure alarm B. fire Mann C. extinguishers D. fusible plugs2548 Air reservoirs are designed, built and tested similarly to _____ 2548．空气瓶的设计、建造和试验类似于锅炉筒(都是压力容器)。

A. boiler drums B. hot wells C. condensers D. evaporators 2544 C 2545 A 2546 B 2547 D 2548 A2549Explosions do occur _____ caused by the ignition of oil or vapour gaining access 2550 from compressors or defective engine starting valves.2549．在启动空气管路中，确实会发生由于油蒸汽被引燃而发生爆炸A. in boiler drums B. in refrigerating plants C. in starting air pipes D. in air coolers2550 A number of biological sewage treatment plants are in use at sea but nearly all work on what is called the extended aeration process. Basically th/s consists of oxygenating the liquor by bubbling air through it. According to the above two sentences, the word "this" _____ 2550．船上使用的生活污水处理装置有几种，但是都是以连续曝气过程来工作的。

A. a sewage treatment plant B. the extended aeration process C. the liquor D. the bubbling air2551 l_ow pressure air is usually taken through _____ or pressure regulators to a low pressure reservoir supplying a ring main through driers.2551．低压空气通常来自于减压阀或压力调节器，然后贮存在低压空气瓶A. globe valves B. butterfly valves C. gate valves D. reducing valves2552 Compressed air is used on board ship for all the following purposes except _____ 2552．船上压缩空气不用作增压空气。

A. starting diesel engines B. pneumatic control systems C. pneumatic tools D. supercharging air 2549 C 2550 B 2551 D 2552 D 2553By far the greatest use is for diesel engine starting using air pressure of 25 2554 bar or more provided by _____ 2553．用作柴油机启动的压缩空气，由往复式压缩机提供，压力在25bar及以上A. rotary compressors B. reciprocating compressors C. centrifugal compressors D. screw compressors2554 Compressors must always be started _____ since pressures otherwise build up rapidly producing very high starting torques.2554．空气压缩机总是在卸载状态下启动的。

A. in the unloaded condition B. in the loaded condition C. in the pre-cooled condition D. in the preheated condition2555 During compressor' s running the accumulated moisture in the separators must be _____ 2555．空气压缩机运转期间，分离器中积聚的水分必须排干A. drained off B. collected C. sent to the crankcases D. separated with oil2556 Some _____ lying in the starting air lines will give rise to corrosion and can cause water hammer.2556．启动空气管路中的水分会加剧腐蚀 A. air B. moisture C. cooling water D. lubricant 2553 B 2554 A 2555 A 2556 B 2557A compressor should never be stopped _____ 25582557．空气压缩机在卸载后才能停车。

2559A. without first cooling it B. without first heating it C. without first unloading it D. without first loading it 2558 By far the greatest item of maintenance of the reciprocating air compressors concerns _____ 1.2558．对于往复式空气压缩机，主要是对气阀装置进行维护保养2.A. the lubrication B. the cooling C. the moisture separation D. the valves2559Bad valves operation of the reciprocating air compressors can be detected by observation of _____ 1.2559．对于往复式空气压缩机，如果注意到排温过高，则表明气阀运行不良。

2. A. the discharge temperature low B. the discharge temperature high C. the discharge pressure rise D. the inter-stage pressure low2560 Adequate attention must be given to the water cooling system of the air compressors, for _____ can cause condensation on the cylinder walls.1.2560．对空压机的冷却水系统应予以足够的注意，过度冷却会在气缸壁上产生凝结液 A. overcooling B. poor cooling C. overloading D. unloading 2557 C 2558 D 2559 B 2560 A2561 A _____ in the air delivery line near to each compressor is essential. 2561．空气排出管路中的单向阀很重要。

A. butterfly valve B. globe valve C. gate valve D. non-return valve2562 A non-return valve in the air delivery line near to the compressor must be _____ type similar to the compressor discharge valve.2562．空气排出管路中的单向阀类似于压缩机的排出阀，都属于低惯性式A. the low inertia B. the high inertia C. the low velocity D. the high velocity2563 To avoid impingement attack, care must be taken with the water _____ through the tubes of the heat exchangers.2563．为避免冲击造成损坏，应注意控制通过热交换器管子内的水流速度。

A. temperature B. velocity C. density D. viscosity2564 In more recent years, _____ heat exchangers have frequently been employed for jacket water and oil cooling.2564，近年来，板式热交换器已广泛用于船舶冷却水系统中A. shell and tube type B. plate type C. coil type D. conical disc type2565 A condenser is a vessel in which _____ is deprived of its latent heat of vaporization and so changed to its liquid state.2565．冷凝器是这样一种容器，它能使蒸汽释放潜热并转变为液态 A. sea water B. fresh water C. vapour D. gas 2561D 2562 A 2563 B 2564 B 2565 C2566 The abbreviation "TDS" about the potable water probably means _____ 2566．饮用水的"TDS”值是指“总溶解固体量”。

A. total dissolved solids B. temperature of distillation of sea water C. total dissolved sodium D. total delivery system2567In general, domestic fresh water tank kept under pressure by an external 2568 supply of _____ 2567．日用淡水柜由压缩空气来保持压力A. forced circulating pump B. compressed air C. gravity tank D. head tank2568 The domestic fresh water pump starters are controlled by pressure switches which operate when the pressure in the tank varies within predetermined limits as water is drawn off. The word "which" means _____ 2568．日用淡水泵的启动器是由压力开关来控制，当柜内压力在预先设定的范围内改变时，该压力开关就能产生作用。

A. starters B. pressure switches C. pressure D. water2569 Distilled water is now largely used on board, this may be corrosive (due to presence of dissolves C02) and _____ to the taste.2569．船上广泛使用造水机产生的淡水，这种水具有腐蚀作用，而且食而无味 A. flat B. slat C. sweet D. acid 2566A 2567B 2568B2570 In a domestic fresh water system, the pump starters are controlled by switches which operate when the pressure in the tank varies within predetermined limits as water is _____ drawn off.2570．日用淡水泵的启动器是由压力开关来控制，当柜内压力在预先设定的范围内改变时，该压力开关就能产生作用。

A. water level B. water flow C. temperature D. pressure2571 The principle of separation by which all commercially available oily water separators function is _____ differential between oil and water.2571．常用油水分离器的分离原理是基于油、水的比重差A. the temperature B. the viscosity C. the gravity D. the size2572 The resistance to the movement of the globule in oily water mixture depends on its size and the _____ of the fluid.2572．汕水混合物中油滴运动的阻力取决于其尺寸大小和流体的粘度。

A. pressure B. velocity C. gravity D. viscosity2573 Placing a filter on the _____ of an oily water separator will "polish" the discharge but overloading must be avoided. 2573．在油水分离器的排出侧安装一个滤器，将使排出的水更“纯净”A. suction side B. discharge side C. by-pass pipe D. sampling pipe 2570 D2571C 2572D 2573B2574The most suitable pump for oily water separator feed duties is _____ 25752574．最适宜于用作油水分离器的供液泵是三螺杆泵(输液平稳，减轻油的乳化)2576 A. a .reciprocating pump B. a vane pump C. a centrifugal pump D. a triple screw pump2575 To assist separation of low viscosity oils steam coils or electric heaters are fitted _____ of the oily water separator.1.2575．为了提高油水分离器的分离效果，往往在油水分离器的上半部分安装蒸汽加热盘管或电加热器，用来对污水进行预热。

2.A. in entrance B. in exit C. in the upper part D. on the outside2576 Sacrificial zinc anodes are used on the saltwater side of diesel engine heat exchangers to _____ 1.2576．在柴油机热交换器海水侧中，使用锌作为牺牲阳极，以减轻对热交换然金属产生的电化学腐蚀 A. reduce electrolytic action on heat exchanger metals B. keep heat transfer surfaces shiny and clean C. prevent rapid accumulation of marine growth D. provide a protective coating on heat exchanger surfaces 2574 d2575 C2576APassage 1 Valve drive mechanism The valve drive mechanism commands the inlet and exhaust valves at the required timing. The valve drive mechanism consists of an inlet and exhaust cam follower (8) each suspended in a plunger of the tappet assembly (7), two tubular push rods (4) with ball joints, two nodular cast iron rocker anna (2) suspended in a rocker ann bearing bracket, two yokes (5) and a yoke guide pins. SeeFig. 4-1. The tappet rollers follow the cam profiles and transfer the movements through push rods to the rocker arms. The rocker aims operate the inlet and exhaust valves through yokes (5). lubrication for the rocker arms comes from the engine's secondary oil supply manifold throughdrillings in the cylinder head and rocker ann bracket. The tappet assembly receives lubricating oil via channels in the engine block from the main supplymanifold. For the roller and shaft, the oil is supplied through the guiding plunger. To compensate for heat expansion a clearance must exist between the rocker ann and yoke. All adjustments have to be done on a cold engine only.1: According to the passage, the best time to adjust the valve clearance is A. before the engine is started。