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47期轮机英语考试题目一单项选择题A1.The___engineisusedforalternatorsandsometimesformainpropulsionprovideapropellerofbetween90to120rpm.A.four-strokeB.two-stroke.C.slowspeedD.reversibleB2.Theabbreviation”MIP”standsfor____,A.middleindicatingpressureB.meanindicatedpressureC.meanpitchD.middleindicatedpowerD3.Thecetanenumberofadieselfueloilindicatesits____.A.viscosityB.acidcontentC.heatingvalueD.ignitionqualityC4.Inatwo-strokeenginethecamshaftrotatesat___theengingrotationalspeed.A.halfB.twiceC.thesamespeedasD.fourtimesD5.Adieselengingissimilartoagasolineengineexceptthattheformerhasno____.A.cross-headB.cylinderC.connectingrodD.sparkplugC6.Itiseasiertoreplaceadrycylinderlinerthanawetonebecause____.A.ofthethinwallthickedssB.honingmakesiteasiertomaintainthedesiredoilfilmC.watersealsarenotrequiredD.itfitsmorelooselyduetoadecreaseinheattransferthroughthecompositewallD7.Amainbearingconsistsoftwoshellswhicharesecuredbymeansofstudsand____.A.tierodsB.thoughboltsC.leadwiresD.bearingcapsC8.Howeverfastorslowthecombustionrate,itisstilla____betweencarbon,hydrogen,sulphandoxygenthatreleasesheat.A.physicaldeformationB.stateexchangeC.chemicalreactionD.coalescenceA9.Duringthefuelinjectionperiod,fuelpressuremustexceedcylindergaspressureto____.A.ensurepenetrationanddistributionofthefuelinthecombustionchamberB.ensuretheneedlevalvesisflushedcleanduringeachinjectionC.preventcombustiongasblowbackintotheopenneedlevalveDpreventreflectedpressurewaveswhentheneddlevalveclose.B10.Inadieselenginelubeoilsystem,whichofthefollowingpartsshouldbelubricatedfirst?A.CamshaftbearingsB.MainbearingsC.PistoncrownsD.CylinderwallsB11.Inadieselengineclosedfreshwatercoolingsystem,theamountofcoolantflowingthroughtheheatexchangeriscontrolledbythe_____,A.suctionpressureregulatorB.thermostaticbypassvalveC.seawatertemperatureD.waterlevelintheexpansiontankC12.Whichofdieselenginecompnentslistedincreasesairdensityandhelpstoimproveengineoperatingefficiency?A.ImpellerB.AirbottleC.AircoolerD.ExhaustdiffuserB13.Alargetwo-stroke/cycledirectreversingdieselengineistoberevered.Priortotheadmissionofstartingairyoumust_____.A.lineuptheengineforrestartingwithdieseloilB.repositionthefuelinjectioncamC.changetheintakeandexhaustvalvecampositionsD.placethestartingcamintheintermediatepositionC14.Whichofthelistedgovernercharacteristicswillgreatlyaffecttheloadsharingrelationshipbetweenparalleleddieselgenerators?A.SensitivityB.PowerC.SpeeddroopD.CompensationC15.Thermocouplepytometersareusedonlarge,mainpropulsiondieselenginestoindicatethetemperatureofthe_____.A.coolingwaterleavingeachcylinderB.fueloilenteringtheinjectorC.exhaustgasesatvariousloactionsD.lubeoilatthebearingsuppliesB16.Afterstartingadieselengine,whichofthelistedopratingconditionsshouldbecheckedfirst?A.AirboxpressureB.LubeoilpressureC.ExhausttemperaturesD.RawwaterpressureC17.Toshutdownadieselengineafteritexceedsthesetmaximumspeed,whichtypeofdevicelistedshouldbeused?A.SpeedlimitinggovernorB.Over-speedgovernorC.Over-speedtripD.Over-speedrelayA18.Thetreatmentofthefueloilsinvolvesstorage,heating,filteringand_____.A.centrifugingB.pressurizingC.atomizationD.ignitingB19.Apropeller,inordertooperateefficiently,mustrolateatarelatively_____speedA.highB.lowC.fastD.lowlyA20.Latcntheatchangesthe___ofwater.A.physical-stateB.temperatureC.atmospheric-pressureD.sensible-pressureC21.Theprimaryfunctionofaflamesafeguardsystem,asusedonamautomaticallyfiredauxiliaryboiler,istoprevent_____.A.accidentaldryfiringandoverpressureB.uncontrolledfiresinthefurnaceC.explosionsintheboilerfurnaceD.overheatingofthepressurepartsA22.Impropermaintenanceofthefuleoilburnersinanautomaticallyfiredauxiliaryboilercouldresuitin_______.A.increasedfuleconsumptionB.increasedfeed-waterconsumptionC.fulepumpfailureD.combustioncontrolsystermfailureA23.Bumerignitionfailureinanautomaticallyfiredauxiliaryboilercouldresultin_____.A.aburnedoutsolenoidintheoilsupplyvalvaB.hightempersureexcessairC.incorrectlysettingthehot-welldumpvalveD.anincorrectlypositionedburnersmubber(缓冲器)relaryB24.Ifthefeedpumpforanauxiliaryboilerfailstodeliverthefeedwatertotheboiler,thecausemaybe___.A.highsteampressureintheboilerB.abnormallyhighfeed-watertempretureC.abnormallyhighboilerwatertemperatureD.steamdemandexceedingfeedpumpcapacity0C25.Gearpumpsareofpositivedisplacementtypepumpsbecausetheydischargeanearconstantamountofliquid_____pressure.A.dependingonB.inrelativeC.regardlessD.becauseofC26.Asuprgearpumpshouldbeoperatedwiththedischargevalves______.A.slightlyopenedB.thorttledC.fullyopenedD.halfwayopenedC27.Anindependentbilgesuctionisreqiredfor____.A.ballasttanksB.sludgetanksC.machineryspacebilgesD.cargoholdbilgesA28.Tothoroughlypumpoutthebilgesueingahorizontallymountedcentrifugalpump,the________.A.pumpmustalwaysbeprimedB.volutemustimpartaradialandrotarymotionofthewaterC.suctionsideconnectinmustguidetheliquidtothelanternringsD.stuffingboxshouldnotbeallowedanywaterleakageB29.Aninadequatereciprocatingbilgepumpdischargeismostoftencausedby________.A.defectivesafetyvalvesB.cloggedsuctionstainersC.scarredcylinderwallsD.cloggeddrai