搜索
中国海事服务中心试卷41805第1页，共5页中华人民共和国海事局2006年第3期海船船员适任证书全国统考试题(总第41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，考试时间为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。一、单项选择题1.Adieselengineissimilartoagasolineengineexceptthattheformerhasno______.A.cross-headB.sparkplugC.connectingrodD.cylinder2.Adieselenginewhichisratedfornormaloperationatacrankshaftspeedof800RPM,iscommonlyclassedasa______.A.slow-speeddieselB.medium-speeddieselC.high-speeddieselD.constant-speeddiesel3.Whichofthedieselenginecomponentslistedincreasesairdensityandhelpstoimproveengineoperatingefficiency?A.ImpellerB.CompressorC.After-coolerD.Exhaustdiffuser4.Foragivensizeengine,thetwo-stroke/cycledieselenginewilldelivermorepowerthanafour-stroke/cycledieselenginebecause______.A.ithasalongerpowerstrokeB.moreairgetsintothecylindereachstrokeC.itdevelopstwiceasmanypowerstrokesatthesamespeedD.highercombustionpressureisdeveloped5.Theintakevalvesinadieselenginearereseatedby______.A.camfollowersB.pushrodsC.combustiongasesD.valvesprings6.Accordingtothewaytheenergyoftheexhaustgasesisutilized,pressure-chargingcanbedividedintotwomainsystems,namely,theconstant-pressuresystemand______.A.thepulse-phasesystemB.thepulseDopplersystemC.thepulsesystemD.thepulseintervalsystem7.Anover-speedsafetydeviceisusuallyfittedtoageneratorenginefor______intheeventofover-speed.A.cuttingpowerofftheengineB.increasingthefuelpumpsettingC.brakingthecrankshaftD.stabilizingtheshipspeed8.Whatpreventativemaintenanceshouldbedonefrequentlytodieselenginestartingairreceivers?A.Draintheaccumulatedmoisture.B.Testthereliefvalves.C.Watchthetemperaturetopreventfluctuationsinpressure.D.Cleantheinteriortoremoveoilandforeignmatter.9.Immediatelyafteranydieselengineisstarted,theengineershouldcheckthe______.A.crankcasepressureB.lubeoilpressureC.seawaterpressureD.exhausttemperature10.Acontrollablepitchpropelleronadieseldrivenvesseleliminatestheneedfor______.A.frictionclutchesB.disconnectclutchesC.reversinggearsD.reductiongears11.Inmotorship,______isoftenusedtorecoversomeoftheheatcarriedintheexhaustgasesfromthemainengine.A.andieseloilheaterB.awasteheatboilerC.afreshwatergeneratorD.adonkeyboiler12.Anexhaustgasbypassisinstalledonawasteheatboilerinorderto______.A.bypassexhaustgasathighloadstopreventexcessivebackpressureB.bypassaportionoftheexhaustgasatpeakloadsforbetterefficiencyC.recycleexhaustgastotheturbochargerD.minimizemoisturecondensationintheboilergaspassagesatlowloads13.Priortolightingoffacoldautomaticallyfiredauxiliaryboiler,youshould______.A.checkandregulatethewaterlevelB.closetheaircockoncefiresarelitC.blowdownthegageglassD.assureprotectivesteamflow14.Flamefailureinanautomaticallyfiredauxiliaryboilercanmostlyresultfroma/an______.A.incorrectelectrodesettingB.incorrectnozzlepositionC.cloggedfuelnozzleD.brokenhightensionlead15.Watersidescaleinafire-tubeboilermaycause______.A.increasedheattransferB.firesideerosionC.highsteamdemandD.overheatedtubes16.Whichofthefollowingwillbetheadvantageofacentrifugalpumpascomparedwithareciprocatingpump?I.Itsdischargeiscontinuous;II.Ithasnointernalvalves;III.Uponaccidentalclosingofdischargevalve,excessivepressurewillnotbuildupA.I,IIB.II,IIIC.I,II,IIID.IIonly17.Whyareremovablesleevesinstalledoncentrifugalpumpshafts?A.Theymakeiteasiertoreplacethepumpshaftpacking.B.Theycanbeeconomicallyreplacedastheywearout.C.Theycanberemovedwhenitisnecessarytolightentheweightofthepump.D.Theyincreasethestrengthoftheshaft.18.Ifoneofthebilgesystemmanifoldvalvesdoesnotproperlyseat,the______.A.bilgewellconnectedtothatvalve,plusthesecondbilgewellbeingpumpedwillbecompletelyemptiedB.bilgesystemwilllosevacuumandpreventtheotherbilgesfrombeingpumpedoutC.bilgewellaftconnectedtothatvalvewillsiphon(虹吸)itscontentstotheforwardbilgewellsD.dischargepressurewillbetoohigh.19.Whichofthelistedstatementsiscorrectconcerningthestartingofcentrifugalpumps?A.Theyshouldalwaysbestartedwiththedischargevalveclosed.B.Theyshouldalwaysbestartedwiththedischargevalveopened.C.Aprimingpumpisalwaysrequiredtofloodtheimpellersuction.D.Theyshouldalwaysbestartedwiththesealinglinevalvesclosed.20.Thesimplestmethodtousefordeterminingifacentrifugalpumpisoperatingasdesigned,isto______.A.closelyobservethepumpdischargetemperatureB.closeoffthedischargevalve,andwatchforariseinpressureC.momentarilycloseoffthesuctionvalve,andwatchforariseinpressureD.useaclamponammeterandcomparethereadingstopastrecords中国海事服务中心试卷41805第2页，共5页21.WhichofthefollowingmodesofheattransferdoesNOTrequireanyphysicalcontactbetweenawarmerandacoolersubstance?A.RadiationB.ConductionC.NaturalconvectionD.Contactdirectly22.Are-heaterinanairconditioningsystemfunctionsto______.A.controlinletairtemperatureB.controlinletairvolumeC.maintainrelativehumidityat15%D.restoreconditionedairtemperaturetoacomfortablelevel23.Inachilledwaterairconditioningunitusingareciprocatingcompressor,therefrigeratingeffectoftheprimaryrefrigerantcanbeincreasedby______.A.increasingrefrigerantpressureinthecoilB.increasingchilledwaterflowthroughthecool