轮机英语大证考试真题43期

1中华人民共和国海事局2007年第2期海船船员适任证书全国统考试题(总第43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.______theengines,thedieselengineis______usedengineonboard.A.Between/morecommonlyB.Among/themostcommonlyC.Between/notmorecommonlyD.Among/notthemostcommonly2.Theaveragepressureexertedonapistonduringeachpowerstrokeistermed______.A.indicatedhorsepowerB.meaneffectivepressureC.exhaustbackpressureD.compressionpressure3.Thecetanenumberratesfuelsfordieselenginesaccordingtoits______.A.antiknockcharacteristicsB.ignitionqualitiesC.ratesofvaporizationD.viscosity4.Thetimebetweeninjectionandignitionofthefuelisknownas______.A.turbulencelagB.afterburningratioC.pre-ignitionlagD.ignitiondelay5.______controlsthefueloiltemperatureinordertoprovideoilatthecorrectviscosityforcombustion.A.TheviscosityregulatorB.ThetemperaturecontrollerC.TheflowmeterD.Thepressureswitch6.Constantcoolingthevariouscomponentsofdieselenginehasanumberoffunctionsexceptfor______.A.goodlubricationB.lowthermalstressC.goodmechanicalpropertiesD.acidcorrosion7.Adevicewhichfunctionstobringadieselenginetoafullstoptoprotectitfromdamageisknownasa/an______.A.torquelimiterB.over-speedtripC.over-speedgovernorD.loadlimitgovernor8.Enginespeedsatwhichresonancecanoccuraretermed______.A.maximumspeedsB.fullspeedsC.seaspeedsD.criticalspeeds9.Prolongedoperationofadieselenginewithaclosedcoolingwatersystematlowerthannormaldesignedoperatingtemperaturescan______.A.increasepoweroutputB.decreaselubeoilviscosityC.eliminatefuelknockD.causesulfuricacidformation10.______onashiptransmitspowerfromtheenginetothepropeller.A.TheautomaticcontrolsystemB.ThespeedregularlysystemC.ThetransmissionsystemD.Thecompressionairsystem11.Ina_____boilerthehotgasesfromthefurnacepassthroughthetubeswhilethewaterisontheoutside.A.water-tubeB.fire-tubeC.exhaustgasD.composite12.Thefuelsupplysystemtoanautomaticauxiliaryboiler,willbeautomaticallyshutdowniftheboiler______.A.salinityisabnormallyB.highsteamdemandistoohighC.feed-waterflowislowD.waterlevelisabnormallylow13.Thewaterinasteamingauxiliaryboilershouldbetesteddailyfor______.A.dissolvedoxygenB.chloridesC.sludgeD.dissolvednitrogen14.Ignitionfailureinanautomaticallycontrolledauxiliaryboilercouldbecausedby______.A.carbondepositsontheflamescannerB.highfueloiltemperatureC.lowfueloilviscosityD.highsteampressure15.Theconcentrationoftotaldissolvedsolidsinthewaterofanauxiliaryboilercanincreaseasaresultof______.A.seawatercontaminationB.frequentsurfaceblowsC.dissolvedoxygende-aerationD.frequentbottomblows16.Somepumpsusepackingassealinggland.Theglandshouldbe______.A.slackenoughtoallowslightleakageoffluidB.slightlychockedC.broughtuptightsoasnottoallowanyleakageD.fittedwithareliefvalve17.Aspurgearpumpshouldbeoperatedwiththedischargevalves______.A.slightlyopenedB.throttledC.fullyopenedD.halfwayopened18.Comparedtoglobeandanglevalves,gatevalves______.A.aremoresuitableforthrottlingB.operatewithlittleornopressuredropwhenfullyopenedC.aremoreeasilyrepairedD.cannotbeusedforservicerequiringinfrequentoperation19.Anincreaseinrotorclearancesinarotarypumpwill______.A.increasedischargepressureB.decreasepumpcapacityC.decreasepumpcavitationD.decreasereactionringclearance220.Theusualsymptomsofcavitationinacentrifugalpumpis______.A.noiseandvibrationB.anincreaseindischargepressureC.anincreaseinsuctionpressureD.liftingofthereliefvalve21.Refrigerantenteringthecompressorofarefrigerationsystemshouldbeinwhichofthefollowingconditions?A.Sub-cooledliquidB.Sub-cooledvaporC.SuperheatedvaporD.Liquid22.______isthecirculationandrefreshingoftheairinaspacewithoutnecessarilyachangeoftemperature.A.RefrigerationB.AirconditioningC.VentilationD.Heating23.Inanairconditioningsystem,moistureisremovedfromtheairby______.A.filterB.separatorsC.ductedtrapsD.dehumidifiers24.Sludgemaybeformedintheoilinthecrankcaseofareciprocatingairconditioningcompressorasaresultof______.A.refrigerantbubblesinthelubeoilB.refrigerantreducingthelubeoilviscosityC.oxidationofthelubeoilfromoverheatingD.reducingtheflocorcloudpointoftheoil25.Ahighrateofseparationbetweenoilandwaterisfavoredby______.A.largesizeofoilglobuleB.lowtemperatureC.highviscosityD.highflowrate26.Whenstarted,acompleteoilywaterseparatingunitisfirstfilled______.Theoilywatermixtureisthenpumpedthroughtheinletpipeintothecoarseseparatingcompartment.A.withdirtywaterB.withcleanwaterC.byoilywaterD.bymixedwater27.Whichisthepollutionpreventionequipment?A.boosterpumpB.evaporatorC.incineratorD.cooler28.The____isusedtoburnoilsludge.A.clarifierB.oilywaterseparatorC.incineratorD.distiller29.Oilwaterseparatorsareusedtoensurethatshipsdon'tdischargeoilwhenpumpingout_____.A.ballastwaterB.boilerwaterC.bilgewaterD.sewagewater30.Whenaclarifierisrunningtheimpuritiesandwatercollectatthebowl______.A.centerB.peripheryC.inletD.upperparts31.Theseparationofimpuritiesandwaterfrom______isessentialforgoodcombustionofdieselengines.A.lubeoilB.fueloilC.turbineoilD.grease32.Brinedensityinadistillingplan