三管轮考证轮机英语4148期试题整理.docx

三管轮考证轮机英语4148期试题整理.docx

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三管轮考证轮机英语4148期试题整理

41期

一、单项选择题

1.Adieselengineissimilartoagasolineengineexceptthattheformerhasno______.

A.cross-headB.sparkplugC.connectingrodD.cylinder

2.Adieselenginewhichisratedfornormaloperationatacrankshaftspeedof800RPM,iscommonlyclassedasa______.

A.slow-speeddieselB.medium-speeddiesel

C.high-speeddieselD.constant-speeddiesel

3.Whichofthedieselenginecomponentslistedincreasesairdensityandhelpstoimproveengineoperatingefficiency?

A.ImpellerB.CompressorC.After-coolerD.Exhaustdiffuser

4.Foragivensizeengine,thetwo-stroke/cycledieselenginewilldelivermorepowerthanafour-stroke/cycledieselenginebecause______.

A.ithasalongerpowerstroke

B.moreairgetsintothecylindereachstroke

C.itdevelopstwiceasmanypowerstrokesatthesamespeed

D.highercombustionpressureisdeveloped

5.Theintakevalvesinadieselenginearereseatedby______.

A.camfollowersB.pushrodsC.combustiongasesD.valvesprings

6.Accordingtothewaytheenergyoftheexhaustgasesisutilized,pressure-chargingcanbedividedintotwomainsystems,namely,theconstant-pressuresystemand______.

A.thepulse-phasesystemB.thepulseDopplersystem

C.thepulsesystemD.thepulseintervalsystem

7.Anover-speedsafetydeviceisusuallyfittedtoageneratorenginefor______intheeventofover-speed.

A.cuttingpowerofftheengineB.increasingthefuelpumpsetting

C.brakingthecrankshaftD.stabilizingtheshipspeed

8.Whatpreventativemaintenanceshouldbedonefrequentlytodieselenginestartingairreceivers?

A.Draintheaccumulatedmoisture.

B.Testthereliefvalves.

C.Watchthetemperaturetopreventfluctuationsinpressure.

D.Cleantheinteriortoremoveoilandforeignmatter.

9.Immediatelyafteranydieselengineisstarted,theengineershouldcheckthe______.

A.crankcasepressureB.lubeoilpressure

C.seawaterpressureD.exhausttemperature

10.Acontrollablepitchpropelleronadieseldrivenvesseleliminatestheneedfor______.

A.frictionclutchesB.disconnectclutchesC.reversinggearsD.reductiongears

11.Inmotorship,______isoftenusedtorecoversomeoftheheatcarriedintheexhaustgasesfromthemainengine.

A.andieseloilheaterB.awasteheatboilerC.afreshwatergeneratorD.adonkeyboiler

12.Anexhaustgasbypassisinstalledonawasteheatboilerinorderto______.

A.bypassexhaustgasathighloadstopreventexcessivebackpressure

B.bypassaportionoftheexhaustgasatpeakloadsforbetterefficiency

C.recycleexhaustgastotheturbocharger

D.minimizemoisturecondensationintheboilergaspassagesatlowloads

13.Priortolightingoffacoldautomaticallyfiredauxiliaryboiler,youshould______.

A.checkandregulatethewaterlevelB.closetheaircockoncefiresarelit

C.blowdownthegageglassD.assureprotectivesteamflow

14.Flamefailureinanautomaticallyfiredauxiliaryboilercanmostlyresultfroma/an______.

A.incorrectelectrodesettingB.incorrectnozzleposition

C.cloggedfuelnozzleD.brokenhightensionlead

15.Watersidescaleinafire-tubeboilermaycause______.

A.increasedheattransferB.firesideerosionC.highsteamdemandD.overheatedtubes

16.Whichofthefollowingwillbetheadvantageofacentrifugalpumpascomparedwithareciprocatingpump?

I.Itsdischargeiscontinuous;II.Ithasnointernalvalves;III.Uponaccidentalclosingofdischargevalve,excessivepressurewillnotbuildup

A.I,IIB.II,IIIC.I,II,IIID.IIonly

17.Whyareremovablesleevesinstalledoncentrifugalpumpshafts?

A.Theymakeiteasiertoreplacethepumpshaftpacking.

B.Theycanbeeconomicallyreplacedastheywearout.

C.Theycanberemovedwhenitisnecessarytolightentheweightofthepump.

D.Theyincreasethestrengthoftheshaft.

18.Ifoneofthebilgesystemmanifoldvalvesdoesnotproperlyseat,the______.

A.bilgewellconnectedtothatvalve,plusthesecondbilgewellbeingpumpedwillbecompletely

emptied

B.bilgesystemwilllosevacuumandpreventtheotherbilgesfrombeingpumpedout

C.bilgewellaftconnectedtothatvalvewillsiphon（虹吸）itscontentstotheforwardbilgewells

D.dischargepressurewillbetoohigh.

19.Whichofthelistedstatementsiscorrectconcerningthestartingofcentrifugalpumps?

A.Theyshouldalwaysbestartedwiththedischargevalveclosed.

B.Theyshouldalwaysbestartedwiththedischargevalveopened.

C.Aprimingpumpisalwaysrequiredtofloodtheimpellersuction.

D.Theyshouldalwaysbestartedwiththesealinglinevalvesclosed.

20.Thesimplestmethodtousefordeterminingifacentrifugalpumpisoperatingasdesigned,isto______.

A.closelyobservethepumpdischargetemperature

B.closeoffthedischargevalve,andwatchforariseinpressure

C.momentarilycloseoffthesuctionvalve,andwatchforariseinpressure

D.useaclamponammeterandcomparethereadingstopastrecords

21.WhichofthefollowingmodesofheattransferdoesNOTrequireanyphysicalcontactbetweenawarmerandacoolersubstance?

A.RadiationB.ConductionC.NaturalconvectionD.Contactdirectly

22.Are-heaterinanairconditioningsystemfunctionsto______.

A.controlinletairtemperature

B.controlinletairvolume

C.maintainrelativehumidityat15%

D.restoreconditionedairtemperaturetoacomfortablelevel

23.Inachilledwaterairconditioningunitusingareciprocatingcompressor,therefrigeratingeffectoftheprimaryrefrigerantcanbeincreasedby______.

A.increasingrefrigerantpressureinthecoil

B.increasingchilledwaterflowthroughthecooler

C.sub-coolingtherefrigerantinthecondenser

D.superheatingtherefrigerantinthecompressor

24.Sludgemayforminthelubricatingoilcrankcaseofareciprocatingairconditioningcompressorasaresultof______.

A.waxprecipitationinthelubeoil

B.contaminationbydust,scale,ormoisture

C.refrigerantbubblesinthelubeoil

D.refrigerantreducingthelubeoilviscosity

25.Placingafilteronthe______ofanoilywaterseparatorwill“polish”thedischargebutoverloadingmustbeavoided.

A.suctionsideB.dischargesideC.by-passpipeD.samplingpipe

26.Whenstarted,acompleteoilywaterseparatingunitisfirstfilled______.Theoilywatermixtureisthenpumpedthroughtheinletpipeintothecoarseseparatingcompartment.

A.withdirtywaterB.withcleanwaterC.byoilywaterD.bymixedwater

27.Whichisthepollutionpreventionequipment?

A.boosterpumpB.evaporatorC.incineratorD.cooler

28.The______isusedtoburnoilsludge.

A.clarifierB.oil/waterseparatorC.incineratorD.distiller

29.Mostmarinebiologicalsewagetreatmentplantsconsistofallthefollowingstatementsexcept______.

A.aerationtanksB.settlingtanks

C.disinfectionagent（消毒剂）D.anaerobicbacteria（厌氧菌）

30.Forapurifierchangingtoagravitydiscwithsmallerholediameterwillmovetheinterfacetowardsthe______.

A.bowlperipheryB.bowlcenterC.uppersurfaceD.lowersurface

31.The______ofthegravitydiscistoobig.Itcauseoiltoflowthroughthewateroutlet.Wechangedthediscandnooilisfoundinthewateroutlet.

A.gravityB.diameterC.circumferenceD.cylinder

32.Theadvantagesofflashtypeevaporators,ascomparedtosubmergedtubetypeevaporators,include______.

A.lessinternalcorrosionbecauseoflowerbrinedensity

B.highertemperatureevaporationforlowersalinityofthedistillateproduced

C.lessscaleformationinaflashevaporator

D.lessfeed-waterrequiredforaflashevaporator

33.Distilledwaterfromanevaporatormaybedischargedintoadrinkingwatertank______.

A.throughadetachablehoseconnection

B.afterpassingthroughanactivatedcharcoalfilter

C.afterchemicalanalysisshowsitisfitforconsumption

D.throughasolenoidoperatedthree-wayvalve

34.Whattypeofvalveisusedtodirecttheflowofhydraulicfluid?

A.reliefvalveB.directioncontrolvalveC.stopvalveD.pressurecontrolvalve

35.Inaradialpistonpump,reversalandcontroloffluidflowareaccomplishedbymovingthe______.

A.centralvalveB.radialplungerC.floatingringD.cylinderbody

36.Inageneralcargocrane,______isfittedtoliftthecargoload.

A.theslewingmotorB.theluffingmotorC.thehoistingmotorD.thefanmoter

37.______areusedtohandleanchorsandchains.

A.CargowinchesB.MooringwinchesC.WindlassesD.Cargohatches

38.Theclutchbandofaconstanttensioningmooringwinchmustbesetuptightenoughtodrivethewinchdrumandshouldsliponlywhen______.

A.excessiveloadsareplacedonthewinch

B.minimumpullisbeingexertedbythewinch

C.automaticoperationofthewinchisdesired

D.wireisbeingretrievedatthemaximumrate

39.Dual（双的）electro-hydraulicsteeringunitsusuallyoperate______.

A.withbothpumpsonlineatthesametimeB．withonepumponstandby

C．withthefollow-upgeardisconnectedD．onlywhentherudderismovedamidships

40.Onefactorthatdeterminesthefrequencyofanalternatoristhe______.

A.numberofturnsofwireinthearmaturecoil

B.numberofmagneticpoles

C.strengthofthemagnetsused

D.outputvoltage

41.Anelectricaldevicewhichemploysastationaryarmatureandarotatingelectromagneticfieldisusedaboardshipasa______.

A.magneticamplifierB.ship'sservicealternator

C.three-wireDCgeneratorD.saturablecorereactor

42.Currentchangingindirectionandrisingandfallinginvalueis___.

A.D.C.B.A.C.C.generatorD.freshwatergenerator

43