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1、中国海事服务中心 试卷 44803 第 1 页，共 4 页中华人民共和国海事局2007 年第 6 期海船船员适任统考试题（总第 44 期）科目：轮机英语 试卷代号：803适用对象：无限/近洋航区 3000KW 及以上船舶大管轮（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 68 题，每题 1 分，第 69 题至 76 题，每题 1.5 分，第 77 题至 78 题，每题 10 分.一、 单项选择题1. The trend nowadays is to build
2、the frame box as a separate fabricated construction and then, after stress relieving and machining the mating surfaces, to mount it on the . This has theadvantage of saving weight.A. seating B. bed-plate C. entablature D. cylinder block2. A two stroke diesel engine exhaust temperature will be lower
3、than a four stroke diesel engine ofthe same displacement because the . MEP is lower and the scavenging air is cooling the exhaust gases valve overlap in a four strokeA. B. C. and D. Neither nor is correct3. Theoretical perfect combustion in a diesel engine yields by-products of .A. aldehydes and car
4、bon dioxide B. water vapor and carbon monoxideC. nitrogen and carbon monoxide D. water vapor and carbon dioxide4. The common method of applying oil to the cylinder walls is by means of small pump assembledin units, known as A. mechanical lubricator B. lubrication functionC. forced feed system D. bea
5、ring lubrication5. In a main propulsion turbocharged diesel engine, the speed of the turbocharger varies according to the .A. governor droop B. speeder spring tensionC. fuel rack lag D. load on the engine6. Diesel engines are started by supplying into the cylinders in the appropriate sequence for th
6、e required direction.A. cooling water B. compressing air C. compressed air D. cylinder oil7. Which of the following devices is a common basic element with nearly all mechanical governors?A. Power piston B. Control rackC. Weights acted on by centrifugal force D. Isochronous（同步的）droop spring8. Injecto
7、rs for use with heavy fuel oil must be cooled by either water or light oil to .A. prevent heat corrosion to internal componentsB. increase fuel delivery rate and economyC. prevent pre-ignition D. avoid carbonization of the nozzle tips9. Loss of lubricating oil pressure to the main propulsion diesel
8、engine will actuate a/an .A. over-speed trip B. audible/visual alarmC. the ships/boats general alarm D. reserve oil storage tank10. If clearance between a piston and the cylinder wall is excessive, piston slap will occur. The slap itself is caused by .A. alternation of side thrustB a breakdown of th
9、e lube oil film on the cylinderC. worn piston boss piston pin bearingsD. fluctuating gas pressure in tile combustion space11. The major cause of fuel pump and injection system problems is .A. improper adjustments B. contaminated fuelC. kinked fuel lines D. excessive engine vibration12. At least _ cy
10、linders in four-stroke engine will be configured to ensure that the engine can started with the crankshaft at whatever position.A. 6 B. 2 C. 12 D. 813. The main propulsion diesel engine jacket water temperature rises above normal, with the raw sea suction and the expansion tank water level being nor
11、mal. Which of the following problems is most likely the cause?A. Faulty thermostatic bypass valve.B. Eroded zinc pencils in the heat exchangerC. Steam formation in the expansion tank.D. Excessive leakage from jacket water pump seals.14. Crankcase explosions in propulsion diesel engines result from .
12、A. the splashing of lubrication oil by the crankshaftB. the dilution of crankcase oil with particles of combustionC. broken fuel lines spraying oil on the crankcaseD. the ignition of unburned fuel and air in the crankcase15. Lubrication for the main reduction gears used with diesel engines is usuall
13、y supplied by .A. oil from the main engine sump B. an independent lube oil systemC. the stern bearing head tank D. the stem bearing sump tank16. Propeller pitch speed minus ship speed divided by the propeller pitch speed is termed .A. apparent slip B. true slip C. pitch D. propulsive efficiency17. O
14、ne of the most common causes of reduction gear failure is gear wear caused by scoring as a result of . A. surface fatigue of the gears B. an inadequate lube oil filmC. plastic flow of the gears D. fretting corrosion from water18. The heat identified by only a change in temperature is known as .A. sensible heat B. latent heat C. total heat D. residual heat19. The expansion valve used in a refrigeration system regulates the .A. superheat of the gas leaving the compressorB. back pressure in the evaporatorC. temperature in the refrigerated spaceD. degree o
