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.cylinderAdieselenginewhichisratedfornormaloperationatacrankshaftspeedof800RPM,iscommonlyclassedasa______.A.slow-speeddieselB.medium-speeddieselC.high-speeddieselD.constant-speeddieselWhichofthedieselenginecomponentslistedincreasesairdensityandhelpstoimproveengineoperatingefficiency?A.ImpellerB.CompressorC.After-coolerD.ExhaustdiffuserForagivensizeengine,thetwo-stroke/cycledieselenginewilldelivermorepowerthanafour-stroke/cycledieselenginebecause______.A.ithasalongerpowerstrokeB.moreairgetsintothecylindereachstrokeC.itdevelopstwiceasmanypowerstrokesatthesamespeedD.highercombustionpressureisdevelopedTheintakevalvesinadieselenginearereseatedby______.A.camfollowersB.pushrodsC.combustiongasesD.valvespringsAccordingtothewaytheenergyoftheexhaustgasesisutilized,pressure-chargingcanbedividedintotwomainsystems,namely,theconstant-pressuresystemand______.A.thepulse-phasesystemB.thepulseDopplersystemC.thepulsesystemD.thepulseintervalsystemAnover-speedsafetydeviceisusuallyfittedtoageneratorenginefor______intheeventofover-speed.A.cuttingpowerofftheengineB.increasingthefuelpumpsettingC.brakingthecrankshaftD.stabilizingtheshipspeedWhatpreventativemaintenanceshouldbedonefrequentlytodieselenginestartingairreceivers?A.Draintheaccumulatedmoisture.B.Testthereliefvalves.C.Watchthetemperaturetopreventfluctuationsinpressure.D.Cleantheinteriortoremoveoilandforeignmatter.Immediatelyafteranydieselengineisstarted,theengineershouldcheckthe______.A.crankcasepressureB.lubeoilpressureC.seawaterpressureD.exhausttemperatureAcontrollablepitchpropelleronadieseldrivenvesseleliminatestheneedfor______.A.frictionclutchesB.disconnectclutchesC.reversinggearsD.reductiongearsInmotorship,______isoftenusedtorecoversom