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