47期轮机英语考试题.docx

47期轮机英语考试题.docx

《47期轮机英语考试题.docx》由会员分享，可在线阅读，更多相关《47期轮机英语考试题.docx（18页珍藏版）》请在冰豆网上搜索。

47期轮机英语考试题

47期轮机英语考试题目

一单项选择题

A1.The___engineisusedforalternatorsandsometimesformainpropulsionprovideapropellerofbetween90to120rpm.

A.four-strokeB.two-stroke.

C.slowspeedD.reversible

B2.Theabbreviation”MIP”standsfor____,

A.middleindicatingpressureB.meanindicatedpressure

C.meanpitchD.middleindicatedpower

D3.Thecetanenumberofadieselfueloilindicatesits____.

A.viscosityB.acidcontent

C.heatingvalueD.ignitionquality

C4.Inatwo-strokeenginethecamshaftrotatesat___theengingrotationalspeed.

A.halfB.twice

C.thesamespeedasD.fourtimes

D5.Adieselengingissimilartoagasolineengineexceptthattheformerhasno____.

A.cross-headB.cylinderC.connectingrodD.sparkplug

C6.Itiseasiertoreplaceadrycylinderlinerthanawetonebecause____.

A.ofthethinwallthickedss

B.honingmakesiteasiertomaintainthedesiredoilfilm

C.watersealsarenotrequired

D.itfitsmorelooselyduetoadecreaseinheattransferthroughthecompositewall

D7.Amainbearingconsistsoftwoshellswhicharesecuredbymeansofstudsand____.

A.tierodsB.thoughboltsC.leadwiresD.bearingcaps

C8.Howeverfastorslowthecombustionrate,itisstilla____betweencarbon,hydrogen,sulphandoxygenthatreleasesheat.

A.physicaldeformationB.stateexchange

C.chemicalreactionD.coalescence

A9.Duringthefuelinjectionperiod,fuelpressuremustexceedcylindergaspressureto____.

A.ensurepenetrationanddistributionofthefuelinthecombustionchamber

B.ensuretheneedlevalvesisflushedcleanduringeachinjection

C.preventcombustiongasblowbackintotheopenneedlevalve

Dpreventreflectedpressurewaveswhentheneddlevalveclose.

B10.Inadieselenginelubeoilsystem,whichofthefollowingpartsshouldbelubricatedfirst?

A.CamshaftbearingsB.Mainbearings

C.PistoncrownsD.Cylinderwalls

B11.Inadieselengineclosedfreshwatercoolingsystem,theamountofcoolantflowingthroughtheheatexchangeriscontrolledbythe_____,

A.suctionpressureregulator

B.thermostaticbypassvalve

C.seawatertemperature

D.waterlevelintheexpansiontank

C12.Whichofdieselenginecompnentslistedincreasesairdensityandhelpstoimproveengineoperatingefficiency?

A.ImpellerB.AirbottleC.AircoolerD.Exhaustdiffuser

B13.Alargetwo-stroke/cycledirectreversingdieselengineistoberevered.Priortotheadmissionofstartingairyoumust_____.

A.lineuptheengineforrestartingwithdieseloil

B.repositionthefuelinjectioncam

C.changetheintakeandexhaustvalvecampositions

D.placethestartingcamintheintermediateposition

C14.Whichofthelistedgovernercharacteristicswillgreatlyaffecttheloadsharingrelationshipbetweenparalleleddieselgenerators?

A.SensitivityB.Power

C.SpeeddroopD.Compensation

C15.Thermocouplepytometersareusedonlarge,mainpropulsiondieselenginestoindicatethetemperatureofthe_____.

A.coolingwaterleavingeachcylinder

B.fueloilenteringtheinjector

C.exhaustgasesatvariousloactions

D.lubeoilatthebearingsupplies

B16.Afterstartingadieselengine,whichofthelistedopratingconditionsshouldbecheckedfirst?

A.AirboxpressureB.Lubeoilpressure

C.ExhausttemperaturesD.Rawwaterpressure

C17.Toshutdownadieselengineafteritexceedsthesetmaximumspeed,whichtypeofdevicelistedshouldbeused?

A.SpeedlimitinggovernorB.Over-speedgovernorC.Over-speedtripD.Over-speedrelay

A18.Thetreatmentofthefueloilsinvolvesstorage,heating,filteringand_____.

A.centrifugingB.pressurizing

C.atomizationD.igniting

B19.Apropeller,inordertooperateefficiently,mustrolateatarelatively_____speed

A.highB.lowC.fastD.lowly

A20.Latcntheatchangesthe___ofwater.

A.physical-stateB.temperatureC.atmospheric-pressureD.sensible-pressure

C21.Theprimaryfunctionofaflamesafeguardsystem,asusedonamautomaticallyfiredauxiliaryboiler,istoprevent_____.

A.accidentaldryfiringandoverpressureB.uncontrolledfiresinthefurnace

C.explosionsintheboilerfurnaceD.overheatingofthepressureparts

A22.Impropermaintenanceofthefuleoilburnersinanautomaticallyfiredauxiliaryboilercouldresuitin_______.

A.increasedfuleconsumption

B.increasedfeed-waterconsumption

C.fulepumpfailure

D.combustioncontrolsystermfailure

A23.Bumerignitionfailureinanautomaticallyfiredauxiliaryboilercouldresultin_____.

A.aburnedoutsolenoidintheoilsupplyvalva

B.hightempersureexcessair

C.incorrectlysettingthehot-welldumpvalve

D.anincorrectlypositionedburnersmubber（缓冲器）relary

B24.Ifthefeedpumpforanauxiliaryboilerfailstodeliverthefeedwatertotheboiler,thecausemaybe___.

A.highsteampressureintheboiler

B.abnormallyhighfeed-watertempreture

C.abnormallyhighboilerwatertemperature

D.steamdemandexceedingfeedpumpcapacity0

C25.Gearpumpsareofpositivedisplacementtypepumpsbecausetheydischargeanearconstantamountofliquid_____pressure.

A.dependingonB.inrelative

C.regardlessD.becauseof

C26.Asuprgearpumpshouldbeoperatedwiththedischargevalves______.

A.slightlyopenedB.thorttled

C.fullyopenedD.halfwayopened

C27.Anindependentbilgesuctionisreqiredfor____.

A.ballasttanksB.sludgetanks

C.machineryspacebilgesD.cargoholdbilges

A28.Tothoroughlypumpoutthebilgesueingahorizontallymountedcentrifugalpump,the________.

A.pumpmustalwaysbeprimed

B.volutemustimpartaradialandrotarymotionofthewater

C.suctionsideconnectinmustguidetheliquidtothelanternrings

D.stuffingboxshouldnotbeallowedanywaterleakage

B29.Aninadequatereciprocatingbilgepumpdischargeismostoftencausedby________.

A.defectivesafetyvalvesB.cloggedsuctionstainers

C.scarredcylinderwallsD.cloggeddrainvalves

B30.Inacompressionrefrigerationplant,thehot,highpressurerefrigerantgasiscooledbytheseawaterandbecomesliquidinthe_______.

A.compressorB.condenser

C.throttlevalveD.evaporator

D31.The___onlyallowsforadjustmentoftemperatureineachroombytheoccupantmanuallycontrollingtheairvolurneadmitted.

A.centralairconditioningsystemB.highvelocitysystem

C.lowvelocitysystemD.singleductsystem

D32.Theopeningofthehumidifier’svalvaofair-conditionershouldbe____,whenthecircurnstanctemperatureisraisedtoabove5~80Cinthewinter.

A.desreasedB.increasedC.fixedD.closed

C33.Undernormalconditions,thequantityofaircirculationbecomeslessandless.Whatisthereason?

A.dirtydcliveryductsB.toomushrefrigerant

C.thefoulingfiltersD.hightemperatureoutside

D34.Whenbilgewaterisheatedinaholdingtank,whichoneofthefollowingstatementsisnotaccurate?

A.Therelativehightemperaturefacilitatesprimarygravityseparation

B.Mostoftheoilandorganicsolvenitsarerisedtothetoplayer

C.Therelativehighthetemperatureis,themorethetopoilwilbecollected

D.Thenormalhightemperaturehaslittleuseontheseparationofemuslsifiedoil.

C35.Ifscparatingefffctoftheoilywatersepareatorisnotgood,wecanimproveitby____.

A.flushingseparatorwithcoldwater

B.increasingbilgewatersupplyflow

C.heatoilywatherproperly

D.openingmanualoildischargevavle

C36.Whichisthepollutionpreventionequipmen?

A.boosterpumpB.evaporator

C.incineratorD.cooler

B37Whendoesauxiliaryburnerofrotarynozzletypeincineratorputintouse?

І.whenignitingП.thewasteoilfordealing-wateristoomushШ.beforestoppingincinerator

A.І+ПB.І+ШC.П+ШDІ+П+Ш

A38.Whenanacrobicbacteriacinvertthesewagetoaninertsludge,____.

A.nooxygenisneededB.oxygenisnecessary

C.oxygenisgivenoffD.nogasisproduced.

C39.ForaI..Opurifier,ifthebackpressureoftheoiloutletietoohigh,theinterfacebetweenoilandwaterinthebolwwill____.

A.beinterruptedB.movedownwards

C.moveoutwardsD.retainoriginalposition

A40.Whenscperatingthelubeoilwithoutadditive,itisususllyworkingwithhotwaher;theaimistoremove___fromit.

A.acidB.oilsludge

C.mechanicalimpurityD.salinity

C41.Ifthebolwofadisktypecentrifugalpurifierwhenopenedasaseparatorisnotprimedthe_____.

A.oilhasatendencytoemulsifyinthebowl

B.purifierwilactasaclarifieratthedischargering

C.oilwilactlostthroughthewaterdischargeports

D.oilsolidswillbedspositedonlyattheintermediatetopdisk

B42.Tubeleaksinthedistillatecoolerofatwostageflashevaporatorwillresultin___.

A.lossofsecongstagevacuum

B.contaminationofthedistillate

C.lowerfeedinlettempercrature

D.contarninationofthesecondstagecondenser

B43.Smalldropletsofwaterentrainedintheflashedvaporproducedinaflash-typeevaporator,areremovedbythe____.

A.spraypipesB.demisters

C.condensersD.splashbaffles

B44.Overflowvalveusuallybeusedto____.

A.controlthefluidflowthroughit

B.preventthepressurebeforeoverflowvalveoverthespecifiedvalue

C.makethepressureafteroverflowvalvesteady

D.controlthedirectionofoilflow

A45.Amongthebasiccategoriesofequipment,whichofthefollowingareusedtoconvertmenchanicalintohydraulicenergy?

A.thehydraulicpumpsB.valves

C.hydrauliccylindersD.hydraulicmotors

C46.Cargohandingunitisratedaccordingtothe___.

A.cargocraneB.jib

C.safeworkingloadD.oilpressure

C47.Thepartoftheanchorwindlassthatcngagestheanchorchainforliftingiscalledthe_____.

A.warpingheadB.fairlead

C.wildcatD.capstan

D48.Inautomatic____,thewhichmaybeoverhanledandwireispiadoffthebarrelatapre-determinedmaximumtension.

A.cranesB.windlassC.capstansD.mooringwinches

D49.Themajorsourceofchemicalcontaminantsinhydraulicfluidis_____,

A.microscopicsteelshavingsB.abrasiv