第46期轮机英语试题.docx

第46期轮机英语试题.docx

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第46期轮机英语试题

第46期轮机英语试题

一单项选择题

D1.Inordertoconcrolthermalstresses,sometypesofmodernenginesusepistonswith__

AheavywallandintensivecoolingBheavywallandnocooling

CthinwallandnocoolingDthinwallandintensivecooling

B2.Theaveragepressureexertedonapistonduringeachpowerstrokeistermed

AindicatedBeaneffectivepressureCexhaustbackpessureDcompressionpressure

A3.Theignitionqualityofadieselfuelisindicatedbythe___

AcetanenumberBvolatilitypointCviscosityindexDoctanenumber

B4.Apistoninafourstrokecyclediseselenginemakesfourstrokeduringeach__

AcrankshaftrevolutionBmechanicalcycleofoperation

CperiodoftwocobustioncyclesDcycleoftwoevents

C5.Crankshaftsofmediumspeedenginesare_____fromasinglepieceofsteel

AunusuallysolidweldedBneverbesolidforged

CalmostinvariablyDalmostinvariablybewelded

B6.Thestartingairenteringthecylinderbeginswhenthepiston______

AhasnearlycometotheTDCBhasjustpasttheTDC

ChasnearlycometotheBDCDhasjustpasttheBDC

D7.Amainbearingconsistsoftwoshellswhicharesecuredbymeansofstudsand_________

AtierodsBthroughboltsCleadwiresDbearingcaps

B8.Comparedtofourstrokecycleengines,two~stroke/cyedieselengineshavethedisadvantageof________

AlesseventorqueBhighercylinderheadtemperaturesC

fewerpowerstrokesperrevolutionDgreaterweight/sizerequirements

A9._____controlsthefueloiltemperatureinordertoprovideoilatthecorrectviscosityforcombustion

ATheviscosityregulatorBThetemperaturecontroller

CTheflowmetetDThepressureswitch

B10.Inadieselenginelubeoilsystem,whichofthefollowingpartsshouldbelubricatedfirst?

AcamshaftbearingsBMainbearingsCPistoncrownsDCylinderwalls

C11Alarge,lowspeed,mainpropulsiondieselengineusesseawatertodirectlycoolthe________

AcylinderheadsBexhaustvalvesCscavengingairDinjectors

D12.Inarubocharger,inletairvelocityisincreasedinthe__________

AinletnozzleringBstationarydiffuserpassages

CcompressoroutletvoluteDrotatingimpellervanes

C13.Eachcylinderhasonestartingvalvewhichisusuallyopenedbyairpressureandclosedby_________

AnutsandboltsBnewjointsCspringforceDsealingrings

B14.Inasimplemechanicalgovernor,the_________

Acentrifugalforcerotatestheball-head

BFlyweightcentrifugalforceisbalancedbyspringforce

Cflyweightcentrifugalforceisbalancedbyhydraulicpressure

Dspeederspringaloneactuatesthefuelcontrolrod

C15.Apyrometerisaninstrumentcommomlyusedtomeasure_______

AcylinderpressureBflameintensity

CexhaustgastemperatureDcrankshaftaxialaliganment

B16.Afterstartingadiseselengine,whichoflistedopetatingconditionsshouldbecheckedfirst?

AairboxpressureBlubeoilpressureCExhausttemperaturesDrawwatertperssure

C17.Ahightemperaturealarmor____whichwillmeltisusedtoguardagainsttheexplosionofcompressor

pipelines

AaflametrapBareliefvalveCafusibleplugDaburstingcap

A18.Whatpreventativemaintenaceshouldbedonefrequentlytodieselenginestartingairreceivers?

Adraintheaccumulatedmoisture

B.Testthereliefvalves.

C.Watchthetemperaturetopreventfluctuationsinpressure.

D.Cleantheinteriortoremoveoilandforeignmatter.

C19.Inreducingenginespeedtoanefficientpropellerspeedbytheuseofreductiongears,_____

Aspeedandtorquearebothreduced

Bspeedisreducedandtorqueremainsunchanged

Cspeedisreducedandtorqueisincreased

Dspeedissometimesunchangedwhiletorqueisincreased

A20.Whichofthefollowingstatementsconcerningfire-tubeboilersiscorrect?

ACombustiongasesflowthroughthetubes

BFlamesimpingeonthetubes

CCombustionoccursinthetubes

DWaterflowsthroughthetubes

C21.Theexhaustboilersareusedtorecoversomeof_____carriedintheexhaustgasfromthemainengine

AwaterBoilCheatDsteam

D22.Thewaterlevelinasteamingauxiliaryboilerwillalways___

Arisewhenthesteampressureisincreased

Bremainconstantaslongasthefeedpumpoperates

Cfallwhenthesteampressureisdecreased

Dvaryasthesteamdemandchanges

D23.whenlightingoffanauxiliaryboiler,whichoftheproblemslistedcouldcausetheburnerstosputter?

AcoldfueloilBlowfueloilpressure

ClowatomizingsteampressureDWaterinthefueloil

B24.Ifthefeedpumpforanauxiliatyboierfailstodeliverthefeedwatertotheboiler,thecausemaybe___

AHighsteampressureintheboilerBabnormallyhighfeed-watertemperatureCabnormallyhighboilerwa

temperatureDsteamdemandexceedingfeedpumpcapacity

A25.Througha_________pump,theliquidistransferredfromthesuctiontothedischargebythemechanical

variationofthevolumeofachamberorchambers.

A.positivedisplacementB.ejectorC.centrifugalD.aircompressor

B26.Sealinglinesprovidesealingliquidflowtothestuffingboxofacentrifugalpump__________

A.topreventseawaterfrompassingoutthestuffingboxwhenahighsuctionheadispresent

B.tocooltheshaftC.inplaceofmechanicalsealsD.inplaceoflanternrings

D27.Whichofthevalveslistedwillbecycledfromfullyopentofullyclosewhenthehandleisturned90degree?

A.ArisingstemgatevalveB.AglobestopvalveC.AcheckvalveD.Abutterflyvalve

A28.Centrifugalpumps,usedtohandlehotliquids,musthaveaminimumflowthroughthemunderalloperating

conditions.Thisflowservesto__________

A.preventoverheatinganddamagetopumprotatingpartsduetorubbing

B.maintainthenetpositivesuctionheadofthepump

C.maintainhydraulicdifferentialinthepumpimpellerpassages

D.purgethepumpofnon-condensablevaporsandgases

B29.Ifyouhearda‘crackling’noiseinacentrifugalpump,themostprobablecauseoftheproblemwouldbe

___________

A.insufficientspeedB.cavitation

C.excessdischargepressureD.excessivenetpositivesuctionhead

A30.Intheprocessof_________,liquidchangesintogas.

A.evaporationBfrostingC.condensingD.compressing

B31.Thedeviceusedforlow-pressurecontrolandhigh-pressurecutoutonacompressoriscalleda

____________.

A.cutoutB.pressurecontrollerC.controllerswitchD.cutoutswitch

D32.Apurgerecoverysystemisusedinacentralairconditioningorrefrigerationsystemto________

A.purgelubeoilfromtheliquidrefrigerantB.recoverwaterpurgedfromthesystem

C.separatefoulgasesfromthereceiverD.purgenon-condensablegaseswithoutlosingrefrigerant

A33.Inanairconditioningsystem,lowheadpressureassociatedwithareciprocatingcompressorcanbethe

resultof___________.

A.brokenvalvespringsB.tightdrivebeltsC.highlinevoltageD.airinthesystem

A34.Whendischargingbilgewateroverboard,whichcriteriamustbeobserved?

A.Therequirementfortheoilcontentofbilgewaterdischargedisunder15ppm

B.Nodischargeinsensitivewaters

C.Anydischargeinsensitivewaters

D.International,nationalorlocalrequirementshavetobeobserved

A35.Thefollowingmeasurescanbeusedtoimproveoilywaterseparator’sseparatingeffectexcept

____________.

A.overhaulingeverytwoyearB.workingatintervals

C.renewingfiltrationmaterialD.properlyheating

C36.disposalofallkindsofgarbagebut_______ListedasbelowisprohibitedwithinSpecialAreas

A.comminutedorgroundpapers,rags,glass,metal

B.plastics

C.foodwastecomminutedorground

Dincineratorash

C37.whendoesauxiliaryburnerofincineratorputintoopertaion?

I.startincineratorwhenitiscold

II.littlewasteoilfordealingwith

III.plentyofwasteoilfordealingwith

IV.thewaterandimpurityinsludgearetoomuch

V.thetemperatureinincineratorislow

VI.dealingwithlittlesolidrubbish

A.II+III+VB.I+II+III+IVC.I+IV+V+VID.I+II+III+VI

A38.bacteriawhichlive______aresaidtobeaerobic.

A.inthepresenceofoxygen

B.withoutoxygen

C.inthepresenceofnutrition

D.withoutnutrition

C39.whencentrifugingheavyfueloil,animportantfactortoconsideristhe_____.1.fuelrate2.viscosityoffueloil

A.1B.2C.12D.neither1nor2iscorrect

B40.toensurelubeoilpurifierworkinginnormalconditon,theintervalbetweentwpsludgedischargingshouldn

exceed______hours.

A2B4C5D6

D41._______cannotcauseoilflowfromwateroutletofselfcleaningpurifier.

A.oiltemperaturetoohighB.diameterofgravitydisctoolarge

C.oiltemperaturetoolowDhighleveltankoutofwater

D42.intheproductionoffreshwaterfromseawaterthroughaprocessofheatingandcooling,thecoolingphase

productionisusuallycalled__________.

AevaporationBdistillationCdehydrationDcondensation

D43.distilledwaterfromanevaporatormaybedischargedintoapotablewatertank_________

A.throughadetachablehoseconnection

B.afterpassingthroughanactivatedcharcoalfilter

C.afterchemicalanalysisshowsitisfitforconsumption

Dthroughasolenoidoperatedthree-wayvalve

B44.whattypeofvalveisusedtodirecttheflowofhydraulicfluid?

A.reliefvalveB.directioncontrolvalve

C.stopvalveD.pressurecontrolvalve

C45.cargohandlingunitisratedaccordingtothe____________tobelifted.

A.cargocraneB.jibC.safeworkingloadD.oilpressure

D46.thecraneisusuallymountedonapedestaltoofferadequate________totheoperator.

A.timeB.placeC.lengthDvisbility

A47.properinternallubricationofahydraulicanchorwindlassleftidlefroextendedperiodscanbeaccomplish

by_________________.

A.performingacheckrunontheunitatregularinterva