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第47期海船船员适任统考试题一、单项选择题1.The______engineisusedforalternatorsandsometimesformainpropulsionwithagearboxtoprovideapropellerofbetween90to120rpm.A.four-strokeB.two-strokeC.slowspeedD.reversible2.Theabbreviation“MIP”standsfor______.A.middleindicatingpressureB.meanindicatedpressureC.meanindicatedpitchD.middleindicatedpower.3.Thecetanenumberofadieselfueloilindicatesits______.A.viscosityB.acidcontentC.heatingvalueD.ignitionquality4.Inatwo-strokeenginethecamshaftrotatesat______theenginerotationalspeed.A.halfB.twiceC.thesamespeedasD.fourtimes5.Adieselengineissimilarthecamshaftrotatesat_______theenginerotationalspeed.A.cross-headB.cylinderC.connectingrodD.sparkplug6.Itiseasiertoreplaceadrycylinderlinerthanawetonebecause______.A.ofthethinwallthicknessB.honingmakesiteasiertomaintainthedesiredoilfilmC.watersealsarenotrequiredD.itfitsmorelooselyduetoadecreaseinheattransferthroughthecompositewall7.Amainbearingconsistsoftwoshellswhicharesecuredbymeansofstudsand______.A.tierodsB.throughboltsC.leadwiresD.bearingcaps8.Howeverfastofslowthecombustionrate,itisstilla______betweencarbon,hydrogen,sulphurandoxygenthatreleasesheat.A.physicaldetormationB.stateexchangeC.chemicalreactionD.coalescence9.Duringthefuelinjectionperiod,fuelpressuremustexceedcylindergaspressureto______.A.ensurepenetrationanddistributionofthefuelinthecombustionchamberB.ensuretheneedlevalveisflushedcleanduringeachinjectionC.preventcombustiongasblowbackintotheopenneedlevalveD.preventreflectedpressurewaveswhentheneedlevalvecloses10.Inadieselenginelubeoilsystem,whichofthefollowingpartsshouldbelubricatedfirst?A.CamshaftbearingsB.MainbearingsC.PistoncrownsD.Cylinderwalls11.Inadieselengineclosedfreshwatercoolingsystem,theamountofcoolantflowingthroughtheheatexchangeriscontrolledbythe______.A.suctionpressureregulatorB.thermostaticbypassvalveC.seawatertemperatureD.waterlevelintheexpansiontank12.Whichofthedieselenginecomponentslistedincreasesairdensityandhelpstoimproveengineoperatingefficiency?A.ImpellerB.AirbottleC.AircoolerD.Exhaustdiffuser13.Alargetwo-stroke/cycledirectreversingdieselengineistobereversed.Priortotheadmissiongofstartingairyoumust______A.lineuptheengineforrestartingwithlightdieseloilB.repositionthefuelinjectioncamC.changetheintakeandexhaustvalvecampositionsD.placethestartingcamingtheintermediateposition14.Whichofthelistedgovernorcharacteristicswillgreatlyaffecttheloadsharingrelationshipbetweenparalleleddieselgenerators?A.SensitivityB.PowerC.SpeeddropD.Compensation15.Thermocouplepyrometersareusedonlarge,mainpropulsiondieselenginestoindicatethetemperatureofthe______.A.coolingwaterleavingeachcylinderB.fueloilenteringtheinjectorC.exhaustgasesatvariouslocationsD.lubeoilathebearingsupplies16.Afterstartingadieselengine,whichofthelistedoperatingconditionsshouldbecheckedfirst?A.AirboxpressureB.LubeoilpressureC.ExhausttemperatureD.Rawwaterpressure17.Toshutdownadieselengineafteritexceedsthesetmaximumspeed,whichtypeofdevicelistedshouldbeused?A.SpeedlimitinggovernorB.Over-speedgovernorC.Over-speedtripD.Over-speedrelay18.Thetreatmentofthefueloilsinvolvesstorage,heating,filteringand______.A.centrifugingB.pressurizingC.atomizationD.igniting19.Apropeller,inordertooperateefficiently,mustrotateatarelatively______speed.A.highB.lowC.fastD.lowly20.Latentheatchangesthe______ofwater.A.physicalstateB.temperatureC.atmosphericpressureD.sensiblepressure21.Theprimaryfunctionofaflamesafeguardsystem,asusedonanautomaticallyfiredauxiliaryboiler,istoprevent______.A.accidentaldryfiringandoverpressureB.uncontrolledfiresinthefurnaceC.explosionsintheboilerfurnaceD.overheatingofthepressureparts22.Impropermaintenanceofthefueloilburnersinanautomaticallyfiredauxiliaryboilercouldresultin______.A.increasedfuelconsumptionB.increasedfeed-waterconsumptionC.fuelpumpfailureD.combustioncontrolsystemfailure23.Burnerignitionfailureinanautomaticallyfiredauxiliaryboilerwouldbecausedby______.A.aburnedoutsolenoidintheoilsupplyvalveB.hightemperatureexcessairC.incorrectlysettingthehot-welldumpvalveD.anincorrectlypositionedburnersnubber(缓冲器)relay24.Ifthefeedpumpforanauxiliaryboilerfailstodeliverthefeedwatertotheboiler,thecausemaybe______.A.highsteampressureintheboilerB.abnormallyhighfeed-watertemperatureC.abnormallyhighboilerwatertemperatureD.steamdemandexceedingfeedpumpcapacity25.Gearpumpsareofpositivedisplacementtypepumpsbecausetheydischargeanearconstantamountofliquid______pressure.A.dependingonB.inrelativetoC.regardlessofD.becauseof26.Aspurgearpumpshouldbeoperatedwiththedischargevalves______.A.slightlyopenedB.throttledC.fullyopenedD.halfwayopened27.Anindependentbilgesuctionisrequiredfor_______.A.ballasttanksB.sludgetanksC.machineryspacebilgesD.cargoholdbilges28.Tothoroughlypumpoutthebilgesusingahorizontallymountedcentrifugalpump,the______.A.pumpmustalwaysbeprimedB.volutemustimpartaradialandrotarymotionofthewaterC.suctionsideconnectionmustguidetheliquidtothelanternringsD.stuffingboxshouldnotbeallowedanywaterleakage29.Aninadequatereciprocatingbilgepumpdischargeismostoftencausedby______.A.defectivesafetyvalvesB.clogg