轮机英语42期考题

中国海事服务中心试卷42801第1页，共4页中华人民共和国海事局2007年第1期海船船员适任证书全国统考试题(总第42期)科目：轮机英语试卷代号：801适用对象：无限、近洋航区3000KW及以上船舶轮机长（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68题，每题1分，第69题至76题，每题1．5分，第77题至78题，每题10分。一、单项选择题1.Duringthevalveoverlapperiod,theexhaustpressureofaturbochargedfour-stroke/cycledieselenginemustbelessthantheintakemanifoldpressuretoensure______.A.effectivecylinderscavengingandcoolingB.constantpressurefromtheturbochargersC.cooleroperationoftheexhaustsystemD.effectiveconstantpressureforturbochargeroperation2.Therelativeairpressureintheinletmanifoldofaturbochargeddieselengineisusually______.A.greaterthantheaverageexhaustmanifoldpressureB.lessthantheaverageexhaustmanifoldpressureC.greaterattheturbinewheelthanattheimpellerD.greateratreducedenginespeed3.Coolingofenginesisachievedbycirculatingacoolingliquidaroundinternal______withintheengine.A.airB.passagesC.pipesD.means4.Anover-speedsafetydeviceisusuallyfittedtoageneratorenginefor___intheeventofover-speed.A.stabilizingtheshipspeedB.increasingthefuelpumpsettingC.brakingthecrankshaftD.cuttingpowerofftheengine5.Theamountoffueldeliveredbyahelicalplungerfuelinjectionpumpiscontrolledby______.A.varyingthepumpdischargepressureB.varyingthepumpreturnpressureC.rotationofthepumpplungerD.rotationofthepumpbarrel6.Prolongedoperationofadieselenginewithaclosedcoolingwatersystem,atlowerthannormaldesignedoperatingtemperaturescan______.A.increasepoweroutputB.decreaselubeoilviscosityC.eliminatefuelknockD.causesulfuricacidformation7.Ifthesump______weretorisethiswouldindicatewaterleakageintotheoilandaninvestigationintothecausemustbemade.A.temperatureB.viscosityC.leverD.level8.Inadieselengine,whenrefittingpistonringsyoushould______.I.checktheringgapatthesmallestdiameterofthecylinderII.removecarbonfromtheringgrooveA.IonlyB.IIonlyC.bothIandIID.neitherInorII9.Fuelhasbeeninjectedbutignitionfails.Thepossiblecausemaybe______.A.slightlyleakyexhaustvalveB.increasedscavengingairtemperatureC.enginecylindersnotscavengedsufficientlyD.toomuchwaterinthefueloil10.Ifsomeofthecylindersarenotfiring,theonesaffectedmaybedeterminedbywatching_____.A.theexhausttemperatureB.theexhaustpressureC.thegovernorD.thefuelflowmeter11.Themajorcauseoftroubleinamechanical-hydraulicgovernoriscontaminationofthehydraulicfluidby______.A.dirtB.fueloilC.governorcoolingwaterD.fueloiltar(焦油)12.Modernmarinedieselenginesequippedwithmechanicalfuelinjectionoperateonacombustionphasewithinthecyclewhichis______.A.entirelyconstantpressureB.entirelyconstanttemperatureC.acombinationofconstantvolumeandconstantpressureD.acombinationofconstanttemperatureandconstantpressure13.Acontrollablepitchpropelleronadieseldrivenvesseleliminatestheneedfor______.A.frictionclutchesB.disconnectclutchesC.reversinggearsD.reductiongears14.Propellerpitchspeedminusshipspeeddividedbythepropellerpitchspeedistermed______.A.apparentslipB.trueslipC.pitchD.propulsiveefficiency15.Pittedreductiongearteethhavingadeepbluecolorwithevidenceofoverheatinghavebeenoperatedwith______.A.excessivespeedB.improperwarm-upC.extrememisalignmentD.inadequatelubrication16.Abypasslineprovidedaroundawasteheatauxiliaryboilerinadieselengineexhaustsystem,maybeusedtoavoidboiler______.A.corrosionatlowengineloadsB.erosionathighengineloadsC.overloadathighengineloadsD.scalingatallexhausttemperatures17.Afireboxexplosioninanautomaticallyfiredauxiliaryboilermaybetheresultof______.A.excessivepurgingbeforelightingoffB.insufficienttrailforignitionperiodC.afaultytransformerintheignitioncircuitD.insufficientpurgingbeforelightingoff18.Aspurgearpumpshouldbeoperatedwiththedischargevalves______.A.slightlyopenedB.throttledC.fullyopenedD.halfwayopened19.Acentrifugalpumpmayfailtodeliverwaterwhenfirststartedifthe______.A.watersealpipeispluggedB.pumpisnotprimedC.sealringisproperlylocatedD.impellerisflooded20.Thesumofthesensibleheatandthelatentheatofanysubstanceisknownas______.A.totalheatB.residualheatC.specificheatD.superheat21.Astheamountofmoistureintheairincreases,thedifferencebetweenthedrybulbandwetbulbtemperatureswill______.A.increaseB.decreaseC.remainunchangedD.begreatestatdewpoint22.Whichoftheproblemslistedcouldcauseerosionoftheexpansionvalvedisksandseats?A.OverchargingthesystemwithrefrigerantB.FaultycompressorsuctionvalveC.FailureofthehighpressurecutoutD.Flashgasformedintheliquidline23.Sludgemaybeformedintheoilinthecrankcaseofareciprocatingairconditioningcompressorasaresultof______.A.refrigerantbubblesinthelubeoilB.refrigerantreducingthelubeoilviscosityC.oxidationofthelubeoilfromoverheatingD.reducingtheflocorcloudpointoftheoil24.______areusedtoensurethatshipsdon'tdischargeoilwhenpumpingoutoilywaterfromanyoilcontaminatedspace.中国海事服务中心试卷42801第2页，共4页A.BoilerB.IncineratorC.OilywaterseparatorD.Sewagetreatmentunit25.The______isusedtoburnoilsludge.A.clarifierB.oilywaterseparatorC.incineratorD.distiller26.Mostmarinebiologicalsewagetreatmentplantsconsistofallthefollowingstatementsexcept______.A.aerationtanksB.settlingtanksC.disinfectionagentD.anaerobicbacteria(厌氧细菌)27.Theseparationofimpurit