轮机英语41期考试

中国海事服务中心试卷41805第1页，共4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-head-B.sparkplugC.connectingrodD.cylinder2.Adieselenginewhichisratedfornormaloperationatacrankshaftspeedof800RPM,iscommonlyclassedasa______.A.slow-speeddiesel-B.medium-speeddieselC.high-speeddieselD.constant-speeddiesel3.Whichofthedieselenginecomponentslistedincreasesairdensityandhelpstoimproveengineoperatingefficiency?A.ImpellerB.CompressorC.After-coolerD.Exhaustdiffuser4.Foragivensizeengine,thetwo-stroke/cycledieselenginewilldelivermorepowerthanafour-stroke/cycledieselenginebecause______.A.ithasalongerpowerstrokeB.moreairgetsintothecylindereachstroke-C.itdevelopstwiceasmanypowerstrokesatthesamespeedD.highercombustionpressureisdeveloped5.Theintakevalvesinadieselenginearereseatedby______.A.camfollowersB.pushrodsC.combustiongases-D.valvesprings6.Accordingtothewaytheenergyoftheexhaustgasesisutilized,pressure-chargingcanbedividedintotwomainsystems,namely,theconstant-pressuresystemand______.A.thepulse-phasesystemB.thepulseDopplersystem-C.thepulsesystemD.thepulseintervalsystem7.Anover-speedsafetydeviceisusuallyfittedtoageneratorenginefor______intheeventofover-speed.-A.cuttingpowerofftheengineB.increasingthefuelpumpsettingC.brakingthecrankshaftD.stabilizingtheshipspeed8.Whatpreventativemaintenanceshouldbedonefrequentlytodieselenginestartingairreceivers?-A.Draintheaccumulatedmoisture.B.Testthereliefvalves.C.Watchthetemperaturetopreventfluctuationsinpressure.D.Cleantheinteriortoremoveoilandforeignmatter.9.Immediatelyafteranydieselengineisstarted,theengineershouldcheckthe______.A.crankcasepressure-B.lubeoilpressureC.seawaterpressureD.exhausttemperature10.Acontrollablepitchpropelleronadieseldrivenvesseleliminatestheneedfor______.A.frictionclutchesB.disconnectclutches-C.reversinggearsD.reductiongears11.Inmotorship,______isoftenusedtorecoversomeoftheheatcarriedintheexhaustgasesfromthemainengine.A.andieseloilheater-B.awasteheatboilerC.afreshwatergeneratorD.adonkeyboiler12.Anexhaustgasbypassisinstalledonawasteheatboilerinorderto______.A.bypassexhaustgasathighloadstopreventexcessivebackpressureB.bypassaportionoftheexhaustgasatpeakloadsforbetterefficiencyC.recycleexhaustgastotheturbocharger-D.minimizemoisturecondensationintheboilergaspassagesatlowloads13.Priortolightingof0facoldautomaticallyfiredauxiliaryboiler,youshould______.-A.checkandregulatethewaterlevelB.closetheaircockoncefiresarelitC.blowdownthegageglassD.assureprotectivesteamflow14.Flamefailureinanautomaticallyfiredauxiliaryboilercanmostlyresultfroma/an______.A.incorrectelectrodesettingB.incorrectnozzleposition-C.cloggedfuelnozzleD.brokenhightensionlead15.Watersidescaleinafire-tubeboilermaycause______.A.increasedheattransferB.firesideerosionC.highsteamdemand-D.overheatedtubes16.Whichofthefollowingwillbetheadvantageofacentrifugalpumpascomparedwithareciprocatingpump?I.Itsdischargeiscontinuous;II.Ithasnointernalvalves;III.Uponaccidentalclosingofdischargevalve,excessivepressurewillnotbuildupA.I,IIB.II,III-C.I,II,IIID.IIonly17.Whyareremovablesleevesinstalledoncentrifugalpumpshafts?A.Theymakeiteasiertoreplacethepumpshaftpacking.-B.Theycanbeeconomicallyreplacedastheywearout.C.Theycanberemovedwhenitisnecessarytolightentheweightofthepump.D.Theyincreasethestrengthoftheshaft.18.Ifoneofthebilgesystemmanifoldvalvesdoesnotproperlyseat,the______.A.bilgewellconnectedtothatvalve,plusthesecondbilgewellbeingpumpedwillbecompletelyemptied-B.bilgesystemwilllosevacuumandpreventtheotherbilgesfrombeingpumpedoutC.bilgewellaftconnectedtothatvalvewillsiphon(虹吸)itscontentstotheforwardbilgewellsD.dischargepressurewillbetoohigh.19.Whichofthelistedstatementsiscorrectconcerningthestartingofcentrifugalpumps?-A.Theyshouldalwaysbestartedwiththedischargevalveclosed.B.Theyshouldalwaysbestartedwiththedischargevalveopened.C.Aprimingpumpisalwaysrequiredtofloodtheimpellersuction.D.Theyshouldalwaysbestartedwiththesealinglinevalvesclosed.20.Thesimplestmethodtousefordeterminingifacentrifugalpumpisoperatingasdesigned,isto______.A.closelyobservethepumpdischargetemperature-B.closeoffthedischargevalve,andwatchforariseinpressureC.momentarilycloseoffthesuctionvalve,andwatchforariseinpressureD.useaclamponammeterandcomparethereadingstopastrecords中国海事服务中心试卷41805第2页，共4页21.WhichofthefollowingmodesofheattransferdoesNOTrequireanyphysicalcontactbetweenawarmerandacoolersubstance?-A.RadiationB.ConductionC.NaturalconvectionD.Contactdirectly22.Are-heaterinanairconditioningsystemfunctionsto______.A.controlinletairtemperatureB.controlinletairvolumeC.maintainrelativehumidityat15%-D.restoreconditionedairtemperaturetoacomfortablelevel23.Inachilledwaterairconditioningunitusingareciprocatingcompressor,therefrigeratingeffectoftheprimaryrefrigerantcanbeincreasedby______.A.increasingrefrigerantpressureinthecoilB.increasingchilledw