三管轮轮机英语大证考试真题41期.docx
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三管轮轮机英语大证考试真题41期
三管轮轮机英语大证考试真题41期
中华人民共和国海事局
2021年第3期海船船员适任证书全国统考试题（总第41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.Adieselengineissimilartoagasolineengineexceptthattheformerhasno______.
A.cross-head
B.sparkplug
C.connectingrod
D.cylinder
2.Adieselenginewhichisratedfornormaloperationatacrankshaftspeedof800RPM,is
commonlyclassedasa______.
A.slow-speeddiesel
B.medium-speeddiesel
C.high-speeddiesel
D.constant-speeddiesel
3.Whichofthedieselenginecomponentslistedincreasesairdensityandhelpstoimproveengine
operatingefficiency?
A.Impeller
B.Compressor
C.After-cooler
D.Exhaustdiffuser
4.Foragivensizeengine,thetwo-stroke/cycledieselenginewilldelivermorepowerthanafour-
stroke/cycledieselenginebecause______.
A.ithasalongerpowerstroke
B.moreairgetsintothecylindereachstroke
C.itdevelopstwiceasmanypowerstrokesatthesamespeed
D.highercombustionpressureisdeveloped
5.Theintakevalvesinadieselenginearereseatedby______.
A.camfollowers
B.pushrods
C.combustiongases
D.valvesprings
6.Accordingtothewaytheenergyoftheexhaustgasesisutilized,pressure-chargingcanbedivided
intotwomainsystems,namely,theconstant-pressuresystemand______.
A.thepulse-phasesystem
B.thepulseDopplersystem
C.thepulsesystem
D.thepulseintervalsystem
7.Anover-speedsafetydeviceisusuallyfittedtoageneratorenginefor______intheeventofover-
speed.
A.cuttingpowerofftheengine
B.increasingthefuelpumpsetting
C.brakingthecrankshaft
D.stabilizingtheshipspeed
8.Whatpreventativemaintenanceshouldbedonefrequentlytodieselenginestartingairreceivers?
A.Draintheaccumulatedmoisture.
B.Testthereliefvalves.
C.Watchthetemperaturetopreventfluctuationsinpressure.
D.Cleantheinteriortoremoveoilandforeignmatter.
9.Immediatelyafteranydieselengineisstarted,theengineershouldcheckthe______.
A.crankcasepressure
B.lubeoilpressure
C.seawaterpressure
D.exhausttemperature10.Acontrollablepitchpropelleronadieseldrivenvesseleliminatestheneedfor______.
A.frictionclutches
B.disconnectclutches
C.reversinggears
D.reductiongears
11.Inmotorship,______isoftenusedtorecoversomeoftheheatcarriedintheexhaustgasesfrom
themainengine.
A.andieseloilheater
B.awasteheatboiler
C.afreshwatergenerator
D.adonkeyboiler
12.Anexhaustgasbypassisinstalledonawasteheatboilerinorderto______.
A.bypassexhaustgasathighloadstopreventexcessivebackpressure
B.bypassaportionoftheexhaustgasatpeakloadsforbetterefficiency
C.recycleexhaustgastotheturbocharger
D.minimizemoisturecondensationintheboilergaspassagesatlowloads
13.Priortolightingoffacoldautomaticallyfiredauxiliaryboiler,youshould______.
A.checkandregulatethewaterlevel
B.closetheaircockoncefiresarelit
C.blowdownthegageglass
D.assureprotectivesteamflow
14.Flamefailureinanautomaticallyfiredauxiliaryboilercanmostlyresultfroma/an______.
A.incorrectelectrodesetting
B.incorrectnozzleposition
C.cloggedfuelnozzle
D.brokenhightensionlead
15.Watersidescaleinafire-tubeboilermaycause______.
A.increasedheattransfer
B.firesideerosion
C.highsteamdemand
D.overheatedtubes
16.Whichofthefollowingwillbetheadvantageofacentrifugalpumpascomparedwitha
reciprocatingpump?
I.Itsdischargeiscontinuous;II.Ithasnointernalvalves;III.Upon
accidentalclosingofdischargevalve,excessivepressurewillnotbuildup
A.I,II
B.II,III
C.I,II,III
D.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.WhichofthefollowingmodesofheattransferdoesNOTrequireanyphysicalcontactbetweena
warmerandacoolersubstance?
A.Radiation
B.Conduction
C.Naturalconvection
D.Contactdirectly
22.Are-heaterinanairconditioningsystemfunctionsto______.
A.controlinletairtemperature
B.controlinletairvolume
C.maintainrelativehumidityat15%
D.restoreconditionedairtemperaturetoacomfortablelevel
23.Inachilledwaterairconditioningunitusingareciprocatingcompressor,therefrigeratingeffect
oftheprimaryrefrigerantcanbeincreasedby______.
A.increasingrefrigerantpressureinthecoil
B.increasingchilledwaterflowthroughthecooler
C.sub-coolingtherefrigerantinthecondenser
D.superheatingtherefrigerantinthecompressor
24.Sludgemayforminthelubricatingoilcrankcaseofareciprocatingairconditioningcompressor
asaresultof______.
A.waxprecipitationinthelubeoil
B.contaminationbydust,scale,ormoisture
C.refrigerantbubblesinthelubeoil
D.refrigerantreducingthelubeoilviscosity
25.Placingafilteronthe______ofanoilywaterseparatorwill“polish”thedischargebut
overloadingmustbeavoided.
A.suctionside
B.dischargeside
C.by-passpipe
D.samplingpipe
26.Whenstarted,acompleteoilywaterseparatingunitisfirstfilled______.Theoilywatermixture
isthenpumpedthroughtheinletpipeintothecoarseseparatingcompartment.
A.withdirtywater
B.withcleanwater
C.byoilywater
D.bymixedwater
27.Whichisthepollutionpreventionequipment?
A.boosterpump
B.evaporator
C.incinerator
D.cooler
28.The______isusedtoburnoilsludge.
A.clarifier
B.oil/waterseparator
C.incinerator
D.distiller
29.Mostmarinebiologicalsewagetreatmentplantsconsistofallthefollowingstatementsexcept
______.
A.aerationtanks
B.settlingtanks
C.disinfectionagent（消毒剂）
D.anaerobicbacteria（厌氧菌）
30.Forapurifierchangingtoagravitydiscwithsmallerholediameterwillmovetheinterface
towardsthe______.
A.bowlperiphery
B.bowlcenter
C.uppersurface
D.lowersurface
31.The______ofthegravitydiscistoobig.Itcauseoiltoflowthroughthewateroutlet.We
changedthediscandnooilisfoundinthewateroutlet.
A.gravity
B.diameter
C.circumference
D.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.reliefvalve
B.directioncontrolvalve
C.stopvalve
D.pressurecontrolvalve
35.Inaradialpistonpump,reversalandcontroloffluidflowareaccomplishedbymovingthe
______.
A.centralvalve
B.radialplunger
C.floatingring
D.cylinderbody
36.Inageneralcargocrane,______isfittedtoliftthecargoload.
A.theslewingmotor
B.theluffingmotor
C.thehoistingmotor
D.thefanmoter
37.______areusedtohandleanchorsandchains.
A.Cargowinches
B.Mooringwinches
C.Windlasses
D.Cargohatches
38.Theclutchbandofaconstanttensioningmooringwinchmustbesetuptightenoughtodrivethe
winchdrumandshouldsliponlywhen______.
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.
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