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海船船员适任证书.doc

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中国海事服务中心试卷41805第PAGE\*MERGEFORMAT18页，共NUMPAGES\*MERGEFORMAT18页 海船船员适任证书(二/三管轮)模拟试题 轮机英语（一） （本试卷卷面总分100分，第1题至74题，每题1分，第75题至78题，每题1.5分,第79题至80题,每题10分。及格分为70分，考试时间100分钟） 单项选择题 Adieselengineissimilartoagasolineengineexceptthattheformerhasno______.A.cross-headB.sparkplugC.connectingrodD.cylinder Adieselenginewhichisratedfornormaloperationatacrankshaftspeedof800RPM,iscommonlyclassedasa______.A.slow-speeddieselB.medium-speeddieselC.high-speeddieselD.constant-speeddiesel Whichofthedieselenginecomponentslistedincreasesairdensityandhelpstoimproveengineoperatingefficiency?A.ImpellerB.CompressorC.After-coolerD.Exhaustdiffuser Foragivensizeengine,thetwo-stroke/cycledieselenginewilldelivermorepowerthanafour-stroke/cycledieselenginebecause______.A.ithasalongerpowerstrokeB.moreairgetsintothecylindereachstrokeC.itdevelopstwiceasmanypowerstrokesatthesamespeedD.highercombustionpressureisdeveloped Theintakevalvesinadieselenginearereseatedby______.A.camfollowersB.pushrodsC.combustiongasesD.valvesprings Accordingtothewaytheenergyoftheexhaustgasesisutilized,pressure-chargingcanbedividedintotwomainsystems,namely,theconstant-pressuresystemand______.A.thepulse-phasesystemB.thepulseDopplersystemC.thepulsesystemD.thepulseintervalsystem Anover-speedsafetydeviceisusuallyfittedtoageneratorenginefor______intheeventofover-speed.A.cuttingpowerofftheengineB.increasingthefuelpumpsettingC.brakingthecrankshaftD.stabilizingtheshipspeed Whatpreventativemaintenanceshouldbedonefrequentlytodieselenginestartingairreceivers?A.Draintheaccumulatedmoisture.B.Testthereliefvalves.C.Watchthetemperaturetopreventfluctuationsinpressure.D.Cleantheinteriortoremoveoilandforeignmatter. Immediatelyafteranydieselengineisstarted,theengineershouldcheckthe______.A.crankcasepressureB.lubeoilpressureC.seawaterpressureD.exhausttemperature Acontrollablepitchpropelleronadieseldrivenvesseleliminatestheneedfor______.A.frictionclutchesB.disconnectclutchesC.reversinggearsD.reductiongears Inmotorship,______isoftenusedtorecoversom