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.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
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