48期海员适任统考轮机英语3000kw及以上试题.doc

48期海员适任统考轮机英语3000kw及以上试题2009年第5期海船船员适任统考试题（总第48期）科目：轮机英语 试卷代号：805适用对象：无限近洋航区3000kw及以上船舶二/三管轮（本试卷卷面总分100分，及格分为70分，考试时间100分钟）答题说明：请选择一个最合适的答案，并将该答案按答题卡要求在其相应位置上用2B铅笔涂黑第1题至88题，每题1分，第89题至96题，每题1.5分一、单项选择题1. Diesel engines classified as reciprocating internal combustion engines because they____A. use energy from fuel burned outside their cylindersB. burn fuel in a combustion chamber that moves back and forthC. burn fuel in a chamber where its energy moves a piston up and downD. a continuous combustion process to impart rotary motion to the pistons2. The abbreviation “MIP” stands for _____A. middle indication pressure B. mean indicated pressure C. mean indicated pitch D. middle indicated power3. The term used to express the ignition quality of a particular fuel is _____ A. cetane number B. octane number C. ignition index number D. volatility point4. The period when both inlet valves and exhaust valves are open is referred to as____ A. valve loop B. valve uniflow C. valve overlap D. valve grinding5. Which of the following statements represents the function of the compression rings installed at the top of a diesel engine piston? A. Control the amount of lube oil burned in the combustion chamber B. Transmit heat from the piston to the cylinder liner C. Prevent damage to ring groove inserts by action as a heat dam. D. Dissipate combustion chamber gas pressure by channeling it through the ring gap.6. The gas loads on the engine structure are constrained by means of hydraulically preloaded_____ Which connect the bed plate, frame sections and cylinder jackets into a single unit. A. connecting rods B. mean bearing C. column D. the rods7. ______of different thickness are inserted between the shells to enable adjustment of the bearing clearness. A. Screws B. Films C. Dises D. Shims8. Compared to four-stroke/cycle engines, two-stroke/cycle diesel engines have the disadvantages of ____ A. less even torque B. higher cylinder head temperatures C. fewer power stroke per revolution D. greater weight/size requirements9. During the fuel imection period, fuel pressure must exceed cylinder gas pressure to _____ A. ensure penetration and distribution of the fuel in the combustion chamber B. ensure the needle valve is flushed clean during each injection C. prevent combustion gas blowback into the open needle valveD. prevent reflected pressure waves when the needle valve closes10. The upper piston rings in large, slow-speed, two-stroke cycle diesel engines are most effectively lubricated by oil ____ A. fed from mechanical lubricators B. thrown off from the main bearings C. supplied form wick fed drip lubricators D. flow from a centrifugal banjo oiler11. In a diesel engine closed freshwater cooling system, the amount of coolant flowing through the heat exchange is controlled by the _____A. section pressure regulator B. thermostatic bypass valveC. sea water temperature D. water level in the expansion tank12. The purpose of an after-cooler is to ______ A. reduce the turbocharger operation temperature B. increase the pressure of the inlet air C. increase the density of the inlet air D. reduce the blower operation temperature13. Compressed air is supplied by air compressors to _____ A. the air receivers B. the starting valves C. the cylinder covers D. the distributors14. _____supplies pilot air to control the cylinder air start valves. A. An air receivers B. An indicator cock C. An air distributor D. A safety valve15. Thermocouple pyrometers are used on large, main propulsion diesel engines to indicate the temperature of the ______ A. cooling water leaving each cylinder B. fuel oil entering the injector C. exhaust gases at various locations D. lube oil at the bearing suppliers16. After starting a diesel engine, which of the listed operating conditions should be checked first? A. Air box pressure B. Lube oil pressure C. Exhaust temperatures D. Raw water pressure17. A device which functions to bring a diesel engine to a full stop to protect it from damage is known as a/an _____ A. torque limiter B. over-speed trip C. over-speed governor D. load limit governor18. Air cocks, usually positioned at the ______in a circulating systems, is used to get rid of the air in the system. A. bending joint B. expansion tank C. weld D. the highest point19. Some medium and high-speed diesel engines require reduction gear units to provide a useful propeller speed. In most reduction gears, the bull gear____ A. must churn the oil in the sump B. is connected to the propeller shaft C. is driven at the highest RPM D. compensates for alignment variations between the engin。