【正文】 輪機(jī)工程學(xué)院輔機(jī)教研室 輪機(jī)英語(yǔ)考試強(qiáng)化復(fù)習(xí) （ 3000KW及以上船舶二管輪 /三管輪 ） Jimei University 0801 A large, lowspeed, main propulsion diesel engine uses sea water to directly cool the _____. A. cylinder heads B. exhaust valves C. scavenging air D. injectors Jimei University 0802 The total starting air capacity required for reversible main engines is to be sufficient for at least_____. A. six consecutive starts B. eight consecutive starts C. ten consecutive starts D. twelve consecutive starts Jimei University 0803 Most fuel injection nozzles are opened by_____. A. fuel oil pressure B. a cam operated follower C. a springloaded pressure plate D. timing gears keyed to the crankshaft △ 0804 The lube oil pump used in a diesel engine is a_____. A. volute pump B. centrifugal pump C. diaphragm pump D. gear pump Jimei University *0805 When a waste heat boiler is installed in the exhaust of a main propulsion diesel engine, the exhaust gas bypass would be used_____. A. at high loads to prevent overheating B. at low loads to prevent corrosion in the boiler (防低溫腐蝕 ) C. during periods of high steam demand D. when the turbocharger is in operation Jimei University *0806 Which bearing half will receive the greatest load in a twostroke/cycle diesel engine? A. Lower half of the connecting rod bearing at the crankshaft end of the rod B. Upper half of the main bearing C. Lower half of the piston pin bearing in the connecting rod D. All bearing halves share an equal load *如果是二沖程機(jī) ,最大的負(fù)載由十字頭軸承的下半瓦承受 . Jimei University 0807 A naturally aspirated diesel engine at full throttle will have an intake manifold pressure_____. A. slightly less than atmospheric pressure B. approximately equal to exhaust manifold pressure at all times C. that is widely fluctuating constantly D. decreasing as engine load increases *at full throttle以最高速度 Jimei University 0808 During the fuel injection period, fuel pressure must exceed cylinder gas pressure to ____. A. ensure peration(穿過(guò) , 滲透 ) and distribution of the fuel in the bustion chamber B. ensure the needle valve is flushed clean during each injection C. prevent bustion gas blowback into the open needle valve D. prevent reflected pressure waves when the needle valve closes Jimei University *0809 The overspeeding of the diesel engine driving an electric generator could cause_____. A. low voltage trip to trip(低電壓解列 ) B. reverse power trip to trip (逆功率跳閘 ) C. damage to windings D. excessive exhaust temperatures Jimei University 0810 An increase in the air inlet manifold pressure of a diesel engine will result in a/an _____. A. decrease in maximum cylinder pressure B. increase in ignition lag滯后 C. decrease in fuel consumption per horsepowerhour D. decrease in exhaust manifold pressure Jimei University 0811 For a continuous operation diesel engine, a duplex filter unit would be the best arrangement because_____. A. changing filter elements would not interrupt engine operation B. filtering occurs twice in each pass of oil through the system C. clogging will not occur D. dropping pressure is half of that through a single filter unit Jimei University 0812 The expansion tank for a diesel engine closed cooling system is designed to maintain a constant head on the system and_____. A. reduce water temperature B. reduce water turbulence動(dòng)蕩 C. provide an air cushion (空氣室 ) D. allow for an increase in water volume as the engine warms up (緩沖 ) Jimei University 0813 To minimize corrosion, fuel oil strainer disks碟片 , spacers襯套 and scraper blades 刮片 are made of _____. A. brass B. copper C. iron D. monel metal or stainless steel (蒙乃爾銅 鎳合金 ) * edgetype filter Jimei University 0814 Which of the following statements describes the function of an expansion tank in a diesel engine cooling system? A. Maintains a constant head on the system. B. Reduces the likelihood of air or steam pockets formation. C. Provides a low pressure point for the addition of makeup cooling water. D. All of the above. Jimei University △ 0815 Prior to lighting off a cold automatically fired auxiliary boiler, you should_____. 點(diǎn)火 (完成 ) A. check and regulate the water level B. close the air cock once fires are lit C. blow down the gauge glass D. crack the steam stop to assure protective steam flow Jimei University *0816 One method of constructing large marine diesel engines and reducing the total engine frame weight is through_____. A. casting interlocking ponents B. welding plates to form sections for assembly C. fing integral ponents D. case hardening 表面硬化 integral ponents *與鉚接比較 Jimei University 0817 Which of the following statements is true concerning an oil cooler? A. The oil temperature is less than the cooling water temperature. B. The oil pressure is less than the cooling water pressure. C. The oil pressure is greater than the cooling water pressure. D. The oil flow control valve is always installed in the oil input line. Jimei University △ 0818 The device allowing for the change in volume of the cooling water in a propulsion diesel engine closed cooling system is the_____. A. fresh water expansion tank B. sea water expansion tank C. thermostatic expansion valve D. jacket wate