轮机英语历年真题45期.docx

轮机英语历年真题45期.docx

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轮机英语历年真题45期

中华人民共和国海事局

2008第1期海船船员适任统考试题（总第45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88题，每题1分，第89题至96题，每题1.5分。

一．单项选择题

1.Theseacidresiduesmustbepreventedfromenteringthecrankcase,otherwisethelubeoilwouldbe_________.

A.contaminatedB.emulsifiedC.deterioratedD.oxidated

2.Theratioofthebrakehorsepowertotheindicatedhorsepowerofadieselengineisits_________.

A.thermalefficiencyB.mechanicalefficiency

C.brakethermalefficiencyD.volumetricefficiency

3.Thecetanenumberofadieselfueloilindicatesits________.

A.viscosityB.acidcontentC.heatingvalueD.ignitionquality

4.Thegreatestturbulenceinadieselenginecylinderiscreatedbythe__________.

A.shapeofthecombustionchamberB.fuelinjectionspraypattern

C.cylindersweptvolumeD.degreeofpenetrationofthefueloildroplets

5.Theprojectiononashaftdesignedtochangecircularmotionintoupanddownorbackandforemotioniscalled_________.

A.wheelB.crankshaftC.runninggearD.cam

6.AclearlyvisiblebenefitofRT-flexenginesistheir_________operationatallshipspeeds.Thisisachievedbythesuperiorcombustionperformance.

A.shocklessB.smokelessC.novibrationD.noiseless

7.Amainbearingconsistsoftwoshellswhicharesecuredbymeansofstudsand_________.

A.tierodsB.throughboltsC.leadwiresD.bearingcaps

8.Comparedtofour-stroke/cycleengines,two-stroke/cycledieselengineshavethedisadvantageof________.

A.lesseventorqueB.highercylinderheadtemperatures

C.fewerpowerstrokesperrevolutionD.greaterweightsizerequirements

9.________controlsthefueloiltemperatureinordertoprovideoilatthecorrectviscosityforcombustion.

A.TheviscosityregulatorB.Thetemperaturecontroller

C.TheflowmeterD.Thepressureswitch

10.Alubricantoftenhastoperformmanydutiesinanysituation,inadditiontoitsfundamentaljobof_________.

A.resistingoxidationB.reducingfriction

C.promotingmovingspeedD.developinginertia

11.Shaker,circulation,andsprayarethethreegeneralmethodsusedin__________.

A.pre-injectionfueloiltreatmentB.lubeoilfiltration

C.lubeoilpurificationD.pistoncooling

12.Whichofthedieselenginecomponentslistedincreasesairdensityandhelpstoimproveengineoperatingefficiency?

A.ImpellerB.AirbottleC.AircoolerD.Exhaustdiffuser

13.Eachcylinderhasonestartingvalvewhichisusuallyopenedbyairpressureandclosedby_______.

A.nutsandboltsB.newjointsC.springforceD.sealingrings

14.Whichofthelistedgovernorcharacteristicswillgreatlyaffecttheloadsharingrelationshipbetweenparalleleddieselgenerators?

A.SensitivityB.PowerC.SpeeddroopD.Compensation

15.Apyrometerisaninstrumentcommonlyusedtomeasure________.

A.cylinderpressureB.flameintensity

C.exhaustgastemperatureD.crankshaftaxialalignment

16.Afterstartingadieselengine,whichofthelistedoperatingconditionsshouldbecheckedfirst?

A.AirboxpressureB.Lubeoilpressure

C.ExhausttemperaturesD.Rawwaterpressure

17.Ahightemperaturealarmor_________whichwillmeltisusedtoguardagainsttheexplosionofcompressorairpipelines.

A.aflametrapB.areliefvalveC.afusibleplugD.aburstingcap

18.Greatcareisdedicatedtotheremovalof________fromthescavengeair.

A.gravityB.viscosityC.densityD.humidity

19.Lubricationforthemainreductiongearsusedwithdieselenginesisusuallysuppliedby________.

A.oilfromthemainenginesumpB.anindependentlubeoilsystem

C.thesternbearingheadtankD.thesternbearingsumptank

20.Themaximumpressuredevelopedbyawasteheatboilerisdeterminedbythemainengineexhaust________.

A.gascompositionB.gastemperatureC.pressureD.timing

21.The________isfittedinpair:

oneisthemainvalve,theothertheauxiliaryorstandby.

A.mainsteamstopvalveB.increasedfeed-waterconsumption

C.feedcheckorcontrolvalveD.blowdownvalve

22.Impropermaintenanceofthefueloilburnersinanautomaticallyfiredauxiliaryboiler,couldresultin_______.

A.increasedfuelconsumptionB.increasedfeed-waterconsumption

C.fuelpumpfailureD.combustioncontrolsystemfailure

23.Burnerignitionfailureinanautomaticallyfiredauxiliaryboilerwouldbecausedby_________.

A.aburneroutsolenoidintheoilsupplyvalve

B.hightemperatureexcessair

C.incorrectlysettingthehot-welldumpvalve

D.anincorrectlypositionedburnersnubber（缓冲器）relay

24.Watersidescaleinafire-tubeboilermaycause_________.

A.increasedheattransferB.firesideerosion

C.highsteamdemandDoverheatedtubes

25.Throttlinginthe_________lineofacentrifugalpumpinvolvestheriskofthepumpcavitation.

A.suctionB.exhaustC.pressureD.discharge.

26.Centrifugalpumpscanbedesignedwithanumberofimpellers_________toattainahighfinaldeliverypressure.

A.attwoendsofthesameshaftB.oppositeeachother

C.parallelD.inseries

27.Beforedisconnectingajointinapipeline,youshould__________.

A.determinethesizeofthegasketB.hangabucketunderthejoint

C.haveafirstaidkitonhandD.besurenopressureexistsintheline

28.Tothoroughlypumpoutthebilgesusingahorizontallymountedcentrifugalpump,the_________.

A.pumpmustalwaysbeprimed

B.volutemustimpartaradialandrotarymotionofthewater

C.suctionsideconnectionmustguidetheliquidtothelanternrings

D.stuffingboxshouldnotbeallowedanywaterleakage

29.Whichofthelistedconditionscanleadtocavitationinacentrifugalpump?

A.Vaporpocketsformedinthesuctionflowstream.

B.Roughcasingvolutesurfaces.

C.Wornwearingrings.

D.Heavyfluidintheflowstream.

30.Refrigerantenteringthecompressorofarefrigerationsystemshouldbeinwhichofthefollowingconditions?

A.Sub-cooledliquidB.Sub-cooledvaporC.SuperheatedvaporD.Liquid

31._________isthecirculationandrefreshingoftheairinaspacewithoutnecessarilyachangeoftemperature.

A.RefrigerationB.AirconditioningC.VentilationD.Heating

32.Inachilledwaterairconditioningunitusingareciprocatingcompressor,therefrigeratingeffecttheprimaryrefrigerantcanbeincreasedby_________.

A.increasingrefrigerantpressureinthecoil

B.increasingchilledwaterflowthroughthecooler

C.sub-coolingtherefrigerantinthecondenser

D.superheatingtherefrigerantinthecompressor

33.Ifaplasticfilminsulationbecomesdamagedinairconditioningsystem,_________mayformwithinthefilm.

A.evaporationB.condensationC.liquefiesD.vaporization

34.Theresistancetothemovementoftheglobuleinoilywatermixturedependsonitssizeandthe_________ofthefluid.

A.pressureB.velocityC.gravityD.viscosity

35.Becausetheflowrateofsupplywaterpumpistoolarge,oilywaterseparatordoesnotworkwell.Whichofthefollowingisnotthereason?

A.themonitoringequipmentisoutoforder

B.separatingeffectbecomesbad

C.separatingeffectbecomesbadandinnerwalliscontaminated

D.innerwalliscontaminated

36.Whichofthefollowingwouldnotbeburntinanincineratoronboard?

A.wasteoilB.waterclothesC.oilragsD.plasticgarbage

37.Concerningtheincinerator’soperation,whichofthefollowingisnotcorrect?

A.scavengingtimeshouldbemorethan30secondsbeforeigniting

B.theoiltemperatureofwasteoiltankis80~100°C

C.firstignitingtheincineratorwithdieseloilwhenthetemperatureofhearthisabout600°C,

thewasteoilisdrawnin

D.theashfromincineratorcanbedumpedintoseanodistancelimitation

38.________areusedtodigestforsewagetoproduceinnocuoussludgeinabiologicalsewagetreatmentplant.

A.anaerobicbacteriaB.aerobicbacteria

C.airbubblesD.disinfectionchemicals

39.Acentrifugearrangedtoseparatetwoliquidsisknownas________.

A.anoilywaterseparatorB.apurifier

C.acentrifugalcompressorD.aclarifier

40.Acentrifugalfueloilpurifiershouldbeshutdownif___________.

A.moresealingwaterisneeded

B.thecoverclampneedstightening

C.thepurifierhasabadvibrationwhenstarted

D.waterisdischargedfromtheoverflowline

41.Ifthebowlofadisktypecentrifugalpurifierwhenoperatedasaseparatorisnotprimed,the________.

A.oilhasatendencytoemulsifyinthebowl

B.purifierwillactasaclarifieratthedischargering

C.oilwillbelostthroughthewaterdischargeports

D.oilsolidswillbedepositedonlyattheintermediatetopdisk

42.Inatwo-stageflash-typeevaporator,excessbrineinthefirststageautomaticallypasses________.

A.directlytothesecondstagefeedheater

B.directlyoverboardthroughthebrinecooler

C.intothesecondstageflashevaporator

D.intothesecondstagevaporcondenser

43.Inwhichoftheareaslistedwouldyouexpecttofindthehighestsaltconcentrationinaflashevaporator?

A.DistillerairejectorcoolingmediumB.Saltwaterheaterdischarge

C.First-stageinternalfeedboxD.Second-stageinternalfeedbox

44.Hydraulicscontrolcheckvalvecanbeusedto__________inthemarinehydraulicmechanism.

A.controlthebackpressureofreturnoil

B.locktheoillinesundersomeconditions

C.permitoilflowwithreversaldirection

D.actasreliefvalve

45.Thedeliveryrateofavariablestrokeaxialpistonhydraulicpumpiscontrolledbyvaryingthepositionofthe________.

A.slideblockB.tiltingboxC.pintleD.reactionring

46.Thecraneisusuallymountedonap