《轮机英语》二三管轮考证必备

第一章船舶动力装置1.“Beforedisconnectingtheoilpipe,wouldyouflushtheoilretainedinthepipe?”askedtheoilbargeowner.A．byusingoffreshwaterB．withcompressedair√C．byusingofseawaterD．withchemicalcompound2.“Standbyanengine”means_____.A．“preparetostoptheengine”B．“assembleanengineonitsbedplate”C．“makeanenginereadyforstarting”√D．“dismantleanengine”3.A_____isthefoundationoftheengine,withoutthesupportofwhichtheshaftalignmentinparticular,andenginestructureasawhole,wouldinevitablybelost.A．FrameB．Bedplate√C．CylinderD．Liner4._____arecommonlyusedinmechanical-hydraulicgovernortosenseenginespeeds.A．BulbsB．BulksC．Flyweights√D．Flywheels5._____aregenerallyformedintheframeofthebothin-lineandVeeenginestogivemaintenanceaccesstothecrankshaftmainandconnectingrodlargeendbearing.A．Doors√B．AspirategauzerC．CouplingD．Blind6._____deviceisprovidedtopreventstartingairfrombeingadmittedtothecylinderbeforethereversingiscompleted.A．Anautomatic√B．AtransmissionC．Aself-regulatingD．Aninterlocking7._____fueloils_____lubricatingoilsrequiretreatmentbeforepassingtotheengine.A．Both/and√B．Neither/norC．Either/orD．Both/or8._____issometimesusedforpistoncoolingsinceleaksintothecrankcasewouldnotcauseproblems.A．DieseloilB．HydraulicoilC．Lubeoil√D．Mineraloil9._____istheremovalofexhaustgasesbyblowinginfreshair.A．GasexchangeB．ChargingC．Scavenging√D．Supercharging10._____isusedforcylinderandcylinderhead,thesaltwaterisusedforcoolingthelubricatingoil,thefreshwaterinthecoolersandthechargingairintheaircooler.A．ThefueloilB．ThelubeoilC．TheseawaterD．Thefreshwater√11._____maybethefirstpossiblecausewhichmakestheenginetolosepowerorslowdownwhenitisrunning.A．Hotbearing√B．StartingvalvesC．UnequaldistributionofloadD．Excessivecrankshaftclearance12._____ofanenginecrankshaftcanbedetectedbymeasuringdeflectionsofcrankwebsforeachunitoftheengine.A．Misalignment√B．LengthC．StrengthD．Stresses13._____oftheA-framesthereisastrongcastironframecalledthescavengingairbox.A．Atthetop√B．AtthebottomC．InthetopD．Inthebottom14._____pistonshavelowinertiaandhighcoefficientofthermalexpansion.A．CastironB．CaststeelC．ForgedsteelD．Aluminum√15._____shouldnotundertakeanytaskwhichwillinterferewiththesupervisiondutiesrelatingtothemainmachineryandassociatedequipment.A．Thewatchkeepingpersonnel√B．ThechiefengineerC．ThepersononabunkerbargeD．Anyoftheabove16._____thecylinderwillcontainagreatweightofairandwillbecapableofburningagreatquantityoffuel.A．Atthebeginningofthecompressionstroke√B．AtthebeginningofthesuctionstrokeC．AttheendoftheworkingstrokeD．Attheendoftheexhauststroke17._____thesuperchargepressureis,_____poweranenginedevelops.A．Thehigher/themore√B．Higher/moreC．Higher/littleD．Thehigher/theless18._____isnotproperlysetthuscausingeitheradvancedorretardedfiring.A．ApistonB．Afuelinjectionpump√C．AfeedwaterpumpD．Alubeoilpump19._____rodsarenotinproperconditionsothattoomuchfuelissuppliedtothecorrespondingcylinder.A．PistonB．SoundingC．Regulating√D．Connecting20._____shows1.2meterandthespecificgravityoftheoilis0.96Accordingtothemeasuringscale,thatmakes150tons.A．ThepistonrodB．ThepushrodC．Thesoundingrod√D．Theconnectingrod21._____allowsforexpansionandwatermakeupinthewatercoolingsystem.A．AtoptankB．Aheadtank√C．AheadvalveD．Adraintank22._____attheendofthedistributionpipeensuresthatadequatepressureismaintainedbythepump.A．AreliefvalveB．Analarm√C．ApressuregaugeD．Anon-maimvalve23._____isusedforwashinganddrinking.A．TheballastsystemB．ThesaltwatersystemC．ThebilgesystemD．Thedomesticsystem√24._____providethewatertothepistons.A．PneumaticpipesB．HydraulicpipesC．Telescopicpipes√D．Operatinggaspipes25._____arefittedintheexhaustsystemandfacilitatechargeremovalandscavengingineachcylinder.A．Diffusers√B．CompressorsC．SteamboilersD．Sootblowers26._____areformedbyabrasiveparticlesenteringthebearingandscoringtheshaft.A．Grooves√B．RecessesC．RidgesD．Nips27._____aremountedonandboltedtothebed-platecrossgirders.A．ThecrankshaftB．ThecrankcaseC．Theguide-waysD．Theframes√28._____isaprecautionwhichcontributestoavoidingtroubleundernormaloperatingconditions.A．Constantinspection√B．KeepingconstantloadC．RemainingconstanttemperatureD．varyingspeed29._____isasourceofpowerbywhichthedieselenginemayoperate.A．WaterenergyB．ElectricalenergyC．ChemicalenergyD．Heatenergy√30._____isarrangedforcleaningthelubricatingoilinthesystemandcleanoilcanbeprovidedfromastoragetank.A．AfilterB．Acentrifuge√C．AdistillerD．Agenerator31._____isfullyfloatinginbothconnectingrodsmallendandthepistonskirt.A．ThepistonrodB．ThecrossheadpinC．Thegudgeonpin√D．Thecrank-pin32._____ismadeofabosswithseparatedbladesmountedintoit.A．Avariablepitchpropeller√B．AvariablepitchnutC．AfixedpitchparallelD．Afixedpitchscrew33._____isusuallydrivenbytheenginecamshaftandsuppliespilotairtothecylinderairstartvalve.A．AnairreceiverB．AnoperatingvalveC．AnautomaticvalveD．Anairdistributor√34._____neutralizestheacidconditionsand_____cleansestheringsandgrooves.A．Thedetergency/thealkalinityB．Thealkalinity/thedetergency√C．Theinhabitant/thewaterD．Theadditives/thedistilledwater35._____orairventingarrangementisfittedtothefuelsupplypassage.A．AnairpumpB．AcompressorC．AfuelpumpD．Apriming√36._____providinglubricatingfilms,oilusedinmarinedieselengineshavetoremoveheatfromoilcooledpiston.A．ExceptforB．BesideC．ExceptD．Inadditionto√37._____theengines,thedieselengineis_____usedengineonboard.A．Between/morecommonlyB．Among/themostcommonly√C．Between/notmorecommonlyD．Among/notthemostcommonly38._____waterismoreexpensivethanfreshwaterIthashighspecificheatandlowviscosity.A．Distilled√B．DistillingC．BoilingD．Boiled39._____forthecamshaftgeartrainistakenfromaspurgearwhichforasixcylinderengineisatthecouplingend.A．ThedrivengearB．Thedrive√C．ThegreaseD．Thelubricatingoil40._____inwhatpositiontheenginestopstherewillalwaysbeatleastoneofthecylinderswithitsstartingairvalveopentoadmitcompressedairtostarttheengine.A．BecauseB．OwingtoC．ForD．Nomatter√41._____issecuredbymeansofside-chockboltsandend-chockbolts.A．Thebedplate√B．ThecolumnC．ThemainbearingD．Thedoublebottom42._____usuallyhelpstoinduceairmovementtoassistcombustion.A．CylindercoverB．MainbearingC．TheexhaustvalveD．Thepistonmovement√43._____mayhavetwoemergencysourceofpower,thusrequiringtwoemergencyswitchboards.A．Largepassengervessels√B．GeneralcargoshipsC．ContainershipsD．Oiltankers44._____suppliespilotairtocontrolthecylinderairstartvalves.A．AnaircompressorB．AnindicatorcockC．Anairdistributor√D．Asafetyvalve45._____clearancesinthemainorcrankpinbearingswillsometimesbeindicatedbylossofpressureinthelubricatingsystembeforeanybearingknockisheard.A．ToolargerB．ToosmallerC．ExcessD．Excessive√46.Acaststeelstrongbackisfittedinwayofthecombustionspacetohelpabsorb_____.A．flametemperatureB．fueloilC．airmovementD．gasforces√47.Achargeoffreshairisdrawnintotheenginecylinderandthen_____bythemovingpiston_____veryhighpressure.A．pressed/toB．pressurized/withC．pushed/inD．compressed/to√48.Acommontroublewiththefuelpumpplungerorfuelvalvespindleis_____.A．waterleakageB．steamleakageC．oilleakage√D．airleakage49.Acommontroublewiththefuelpumpplungersorfuelvalvespindleis_____.A．brokendownB．stuckC．oilleakage√D．carbonized50.Adieselengineissimilartoagasolineengineexceptthattheformerhasno_____.A．cross-headB．cylinderC．connectingrodD．sparkplug√51.AdieselenginescrankcaseoillevelisfoundtobetoohighYoushouldsuspectthat_____.A．theenginewasoverfilledB．theremightbeafuelleakC．theremightbeawaterleakD．alloftheabove√52.Adistancepiece,knownasa_____maybeinterposedbetweentherodandthebearinghousing.A．bearingshellB．bearinglinerC．compressionplate√D．leadwire53.Adistancepiece,withgroundfaces,knownasacompressionplate,maybeinterposedbetweentherodandthebeatinghousing,itsthicknessbeingchosentoensurethecorrect_____.A．compressionpressureB．compressiontestC．compressionratio√D．compressionclearance54.Adistancepiece,withgroundfaces,maybeinterposedbetweentherodandthebearinghousing,itsthicknessbeingchosentoensurethecorrect_____.A．expansionratioB．pressureratioC．compressionratio√D．clearanceratio55.Agovernorautomaticallycontrolsenginespeedbyregulating_____.A．fuelsupply√B．firingorderC．engineloadD．oillevel56.Agudgeonpininatrunkpistonmaybefreetofloatandrotate,with_____tolimitaxialmovement.A．splitpinsB．crankpinsC．dipsticksD．circlips√57.Aheaterinthecircuitfacilitateswarningoftheenginepriorto____bycirculatinghotwater.A．starting√B．stoppingC．tostartD．tostop58.Ahightemperaturealarmor_____whichwillmeltisusedtoguardagainsttheexplosionofcompressorairpipelines.A．aflametrapB．areliefvalveC．afusibleplug√D．aburstingcap59.Ahotairstartpipeindicatesthatthereis_____.A．inefficientcoolingB．aleakingairstartvalve√C．acloggeddrainvalveD．aleakingairbottle60.Alevelgaugeforatankisto_____.A．givethepressureB．givethecontents√C．givetheshapeofthetankD．givetheaccuracylevel61.Alubricantoftenhastoperformmanydutiesinanysituation,inadditiontoitsfundamentaljobof_____.A．resistingoxidizationB．reducingfriction√C．promotingmovingspeedD．developinginertia62.Amainbearingconsistsoftwoshellswhicharesecuredbymeansofstudsand_____.A．tierodsB．throughboltsC．leadwiresD．bearingcaps√63.Anumberofcylinderlinersareenclosedinonecastironcasingtoforma_____.A．cylindercoverB．cylinderblock√C．cylinderframeD．bed-plate64.Areductioninloadonadieselengineresultsin_____ofspeedofthecrankshaft.A．areductionB．anincrease√C．anoutingD．adownwards65.Aseparatepistoncoolingsystemisused_____anycontaminationfrompistoncoolingglandstothepistoncoolingsystemonly.A．tohelpB．tolimit√C．toprotectD．toremove66.Aseparatepistoncoolingsystemisusedtolimitanycontamination_____pistoncoolingglands_____thepistoncoolingsystemonly.A．between,toB．either,orC．from,to√D．neither,nor67.Asinglepiece_____fittedwithbronzeringsguidesthepistoninthecylinderliner.A．pistonskirt√B．pistoncrownC．guidewayD．cross-head68.Avariablepitchpropellerismade_____abosswithseparatebladesmountedintoit.A．ofB．upof√C．fromD．out69.A:PleasetellmethespecificationsandquantityB:_____.A．PumpdieseloilfirstB．300tonsof180cstfueloil√C．ThefigureisallrightD．OK,I’llsignit70.Abouthalfanhourbeforetheengineisrequired,coolingwaterat_____mustbecirculated.A．morethantheworkingtemperatureB．lessthantheworkingtemperatureC．theworkingtemperature√D．thesameasthesurroundingtemperature71.Accordingtothewaytheenergyoftheexhaustgasesisutilized,pressure-chargingcanbedividedintotwomainsystems,namely,theconstant-pressuresystemand_____.A．thepulse-phasesystemB．thepulseDopplersystemC．thepulsesystem√D．thepulseinterval72.Acidsolutioninthesystemcanbetestedfromtimetotimebyputtingsomeontoapieceoflime.A．strength√B．denseC．percentageD．velocity73.Additives_____protectivelayersonmetalsurfacesguardingthemagainstcorrosion.A．damageB．form√C．dissolveD．contaminate74.Adjust_____bymeansofleadwire.A．theclearanceofthemainbearing√B．thediameterofmainbearingC．thegapofmainbeatingD．thetoleranceofmainbearing75.Administrationsshouldbearinmindthesignificanceof_____inmaintainingsafetyoflifeandpropertyatseaandinpreventingmarinepollution.A．advancednauticalequipmentB．advancedperformancemainenginesC．emergencyequipmentD．communicationandlanguageskills√76.A-framesandcylinderblockisheldtogetherby_____toformarigidstructure.A．connectingrodsB．pistonrodsC．tierods√D．jack-bolts77.A-framesaremountedonthebedplateandsupport_____andcylinderblock.A．themainbearingB．thecylindercoverC．theentablature√D．thesumpandindicatorcocksopened,andthecoolingwaterkeptrunning.A．steeringB．timingC．turning√D．running79.Afterensuringthatthe_____iscorrectthebearingclearanceshouldbechecked.A．napB．gapC．nip√D．deflection80.Afterfittingbackinplacethegearwheels,dontforget_____them.A．togrease√B．greasingC．oilingD．lubricating81.Afterpassingthroughtheturbinetheexhaustgasisconductedoutintothe_____.A．intercoolerB．compressorC．cylinderD．openair√82.Aftertheengineiswarned,weshould_____theturninggearbeforestartinguptheengine.A．takeinB．putinC．takeout√D．putup83.Aftertheorder“_____”isgiven,theairsystemisshutdown,theturninggearputin.A．FinishedwithEngine√B．StoptheEngineC．Stand-byEngineD．Slow-downEngine84.Aircocks,usuallypositionedatthe_____inacirculatingsystem,isusedtogetridoftheairinthesystem.A．bendingjointB．expansiontankC．weldD．thehighestpoint√85.Alltheringsareslightlyroundedontheirexternaltopandbottomedgestokeeptheoilfilmonthecylinderlinerduring_____fornewpistonrings.A．therunning-inperiod√B．therunningprocessC．gasexchangeprocessD．theboilerfiring86.Allthreesystemshavetheports_____toswirltheincomingairanddirectitintheappropriatepath.A．angledB．roundedC．beingangledD．beingrounded√87.Althoughthecrankshaftsofmediumdieselenginesappeartoberobust,theyrelyonthesupportof_____todeveloptheirfullstrength.A．thepistonrodsB．thecrankthrowsC．thethrustbearingsD．themainbearings√88.Aluminumpistonshave_____coefficientofthermalexpansioncomparedwiththoseofcastiron.A．higher√B．lowerC．thesameD．noneoftheabove89.Amongtheringsofapistonthe_____oneissubjectedtothegreatestloadandtemperature.A．bottomB．middleC．top√D．noneoftheabove90.Analuminumpistonhaslowerinertiaandhighercoefficientof_____comparedtothatofcastiron.A．viscosityB．twistingmomentsC．inertiaD．thermalexpansion√91.Anelectricallydrivenautomaticallyoperatingauxiliaryblowerisprovidedforslowspeedand_____ofalowspeeddieselengine.A．manoeuvringoperations√B．badcombustionC．coolingD．mooringtrial92.Anincreaseinloadonadieselengineresultsin_____ofspeedofthecrankshaft.A．areduction√B．anincreaseC．anoutingD．adownwards93.Aninterlockintheremoteoperatingvalvelinestopsthevalve_____whentheengineturninggearisengaged.A．toopenB．opening√C．openD．opened94.Anoverspeedsafetydeviceisusuallyfittedtoageneratorenginefor_____intheeventofoverspeed.A．cuttingpowerofftheengine√B．increasingthefuelpumpsettingC．brakingthecrankshaftD．stabilizingtheshipspeed95.Asaheatengine,_____energyisthesourceofpowerbywhichthedieselenginecanbeoperated.A．electricB．heat√C．mechanicalD．exhaust96.Asforadieselengine,lackofcombustionairmaybedueto_____.A．foulingturbine√B．fuelpumpfaultsC．lubricationfailureD．excessivecooling97.Astheplungermovesup,theportsareclosedandthefuel_____anddeliveredtotheinjectornozzleatveryhighpressure.A．beingcompressedB．tobepumpedupC．ispressurized√D．arebuiltup98.Atleast_____cylindersinfour-strokeenginewillbeconfiguredtoensurethattheenginecanbestartedwiththecrankshaftatwhateverposition.A．6√B．2C．12D．899.AtthetopoftheA-framesthereisastrongcastironframecalled_____.A．cylinderlinerB．cylindercoverC．thegearboxD．thescavengingbox√100.Besuretomaketheengineturnby_____beforestartingandafterstopping.A．steeringgearB．turninggear√C．steeringwheelD．turningcycle101.Bearingknocksarelikelytooccurfrom_____.A．lessclearanceB．dirtylubeoilC．overloadD．bearingwear√102.Becausethecastingsofsmallerenginesarenotsobigandheavy,_____andcylinderblockmaybemadeinonepiece.A．thecolumn√B．thejacketC．cylindercoverD．cylinderliner103.Bedplatesarethe_____oftheengine,withoutthesupportofwhichtheshaftalignmentinparticular,andenginestructureasawhole,wouldinevitablybelost.A．hullB．projectionC．graphitizationD．foundation√104.Before"stand-by"isrungontheenginetelegraph,itisusualtogivethemainengine_____aheadandastern.A．abrieftrialwithturninggearB．abrieftrialonpower√C．alongtrialbysteeringgearD．oneminutestrialwithwindlass105.Beforeamarinedieselengineisstartedthecylindersandpistonsmustbe_____.A．cooledtoappropriatetemperatureB．warmedupgraduallytoappropriatetemperature√C．openedupandrenewedD．groundandpolished106.Beforebeingusedthefuelservicetankshouldbedrainedof_____.A．sodasolutionB．mechanicalimpuritiesC．ballastD．waterandresiduals√107.Beforepumpingupthecrankcaseoil,_____shouldbeworkedbyhandtominimizecorrosiveactionontheliners.A．theindicatorsB．thestartingvalvesC．thecylinderlubricators√D．theturninggear108.Beforereplacingapistonyoushouldcheckthatallringsare_____.A．free√B．fastenedC．brokenD．stuck109.Beforereplacingapistonyoushouldchecktheringstoseethatallclearancesandgapsare_____thepermissibletolerances.A．aboveB．atC．overD．within√110.Beforereplacingapistonyoushouldchecktheringstoseethatallclearancesandgapsarewithinthepermissible_____.A．deflectionB．discrepancyC．errorD．tolerance√111.Beforestartingtheenginetheairbottleshouldbe_____.A．pumpedup√B．loadedC．dischargedD．opened112.Beforestartingtheturninggear,_____shouldbeworkedbyhandtominimizecorrosiveactionontheliners.A．theindicatorsB．thestartingvalvesC．thecylinderlubricators√D．theturninggear113.Blow-offofthereliefvalvesoftheenginescylindersmaybecausedby_____.A．toolowleadB．waterinfuelC．tootightspringD．leakage√114.Blow-offofthereliefvalvesofthemaincylindersduringoperationindicates_____.A．thecylindercoveriscrackedB．theinjectorholesiscloggedC．thecamsarenotproperlyset√D．fuelpumpisleaking115.Bridgegaugecanbeusedtomeasure_____ofadieselengine.A．diametersofjournals√B．deflectionsofcrankwebsC．diametersofcrankpinsD．noneoftheabove116.Careandcleanlinessarerequiredwheninstallingdieselfuelfilters_____.A．topreventthefuelsystemfrombecomingair-houndB．topreventthefuelsystembecomingcloggedwithdirtyparticlesC．bothoftheabove√D．topreventthelubricatingoilfromleakingoutofthefilterelement117.Castironcarrierrings,_____machinedgrooves,areprovidedforallthepistons.A．caulkedinto√B．caulkingintoC．pressedintoD．screwedinto118.Chargingisthefillingoftheenginecylinderwithasupplyof_____forcompression.A．waterB．freshair√C．fueloilD．gas119.Chargingisthefillingoftheenginecylinderwithasupplyorchargeoffreshair_____compression.A．toneedB．readyfor√C．wanttoD．goingtobe120.Charging-airpressureincreasesifthereisincorrectcombustionanddropinthe_____ofthedieselengine.A．machineefficiencyB．machineryefficiencyC．mechanicalefficiency√D．mechanicsefficiency121.Compressedairissuppliedbyaircompressionto_____.A．theairreceivers√B．thestartingvalvesC．thecylindercoversD．thedistributors122.Compressedairisusedonboardship_____.A．forstartingdieselenginesB．inpneumaticcontrolsystemC．inpneumatictoolsD．Alltheabovearetrue√123.Constantcoolingthevariouscomponentsofdieselenginehasanumberoffunctionsexceptfor_____.A．goodlubricationB．lowthermalstressC．goodmechanicalpropertiesD．acidcorrosion√124.Coolingenablestheenginemetals_____theirmechanicalproperties.A．toretain√B．toremainC．tomaintenanceD．tohave125.Coolingofengineisachievedbycirculationacoolingliquidaroundinternalpassageswithinthe_____.A．boilerB．heaterC．engine√D．cooler126.Coolingofenginesisachievedby_____acoolingliquidaroundinternalpassageswithintheengine.A．flowedB．flowingC．mixingD．circulating√127.Coolingofenginesisachievedbycirculatingacoolingliquidaroundinternal_____withintheengine.A．airB．passages√C．pipesD．means128.Cracksincylinderandcylindercoversmay_____fromunequalheating.A．makeB．causeC．result√D．produce129.Cracksinthecylindersandcylindercoversmay_____unequalheating.A．resultfrom√B．resultinC．giveoutD．givenfrom130.Cracksinthecylindersandcylindercoversmayresultfrom_____.A．lowspeedB．unequalheating√C．lesslubricatingD．lowchargeairpressure131.Crankshaftsofmediumspeedenginesare_____fromasinglepieceofsteel.A．unusuallysolidweldedB．neverbesolidforgedC．almostinvariablysolidforged√D．almostinvariablybewelded132.Crossscavengingrequiresthefittingof_____topreventairorexhaustgasescapewhenthepistonisatthetopofthestroke.A．aexhaustvalveB．apistonskirt√C．apistoncrownD．anairsuctionvalve133.Cylinderlinercoolingisoftenreferredtoas_____.A．pistoncoolingB．sleevecoolingC．centralcoolingD．jacketcooling√134.Cylindersofmarinedieselenginesarenormallycooledby_____.A．seawaterB．finemineraloilC．sanitarywaterD．freshwater√135.Dieselenginesarestartedbysupplying_____intothecylindersintheappropriatesequencefortherequireddirection.A．coolingwaterB．compressingairC．compressedair√D．cylinderoil136.Dieselenginesarestartedbysupplying_____intothecylindersintheappropriatesequencefortherequireddirection.A．fueloilB．dieseloilC．compressedair√D．jacketwater137.Dieseloilmaybeusedtocool_____ofadieselengine.A．cylindersB．exhaustvalvesC．pistonsD．fuelvalves√138.Dirtinthefueloilsystemofadieselenginecancause_____.A．cloggedfilters√B．poorcombustionC．overloadingofthedieselD．shockoffuellines139.Dirtyoilmustbe_____beforebeingusedagain.A．mixedwithcleanoilB．purified√C．heatedD．strained140.Doorsaregenerallyformedinthe_____ofthebothin-lineandVeeenginestogivemaintenanceaccesstothecrankshaftmainandconnectingrodlargeendbearing.A．bedplatesB．columns√C．cylinderblocksD．safetycaps141.Dueto_____actionofpistonssomerelativemotionbetweenpartsincontactinthecoolantsupplyandreturnsystemmustoccur.A．reciprocating√B．rotatingC．runningD．removing142.During_____,thestartingairvalvesshouldbeclosedtopreventtheenginefromturning.A．overhaul√B．runningC．blowingdownD．Alloftheabovearecorrect143.Duringrepair,lubricationlinesandorificesmustbe_____.A．takenawayB．engagedC．connectedD．sealedoff√144.Duringtheinspection,thestartingairvalvesshouldbeclosed_____theenginefromturning.A．toincreaseB．tospeedupC．toprevent√D．toreduce145.Duringthesuctionstroke,thepistonismoving_____.A．inwardsB．outwardsC．downwards√D．upwards146.Duringworking,whenthepistonisnearthe_____,theairignitesthefinesprayoffuel.A．TDC√B．DTCC．BDCD．BCD147.Eachcrankismadeupoftwocrankwebsjoinedbyacommon_____towhichthebottomendbearingisfitted.A．throwB．crankshaftC．crankpin√D．crosshead148.Eachcylinderhasonestartingvalvewhichisusuallyopenedbyairpressureandclosedby_____.A．nutsandboltsB．newjointsC．springforce√D．sealingrings149.Eachcylinderisclosedatthetopbya_____,madeofaspecialheat-resistantsteel.A．cylinderlinerB．couplingflangeC．cylindercover√D．pistoncrown150.Eachcylinderlineronthemarinemediumspeedengines_____.A．isusuallycooledbyseawaterB．canbereplacedwhenwornout√C．isindirectcontactwiththewaterintheboreofthecylinderD．cantexpandwhenheated151.Eachjournalandpinshouldbeexaminedfor_____andgrooving.A．bridgesB．recessesC．rearsD．ridging√152.Eachpistonstuffingboxisprovidedwithtwosealingringsandthree_____.A．packingsB．pistonringsC．distributorringsD．scraperrings√153.Eitheralowinjectionpressureoraleakageofpistonringsisabletolead_____.A．ahighexhausttemperatureB．ahighsmokyexhaust√C．ahighoutputD．ahighcompression154.Emulsionoilsandsodiumnitritearebothapprovedadditives,butthelattercannotbeusedifanypipesare_____orifanysolderedjointsexit.A．chromedB．weldedC．galvanized√D．bolted155.Emulsionoilsandsodiumnitritearebothapprovedadditives,but_____cannotbeusedifanypipesaregalvanizedorifsolderedjointsexist.A．thelatter√B．latterC．formerD．theformer156.Energylossesdueto_____occurineverymachine.A．speedB．friction√C．impactD．atmosphere157.Engagetheflywheelwiththe_____.A．turninggear√B．motorC．drivinggearD．drivengear158.Engine_____referstotherelativetimeofpositionofcrank,atwhicheachoperationduringthecycleiscommencedandiscompleted.A．timing√B．deviationC．firingorderD．phase159.Engine_____referstotherelativetimeofpositionofcrank,atwhicheachoperationduringthecycleiscommencedandiscompleted.A．timing√B．powerC．firingorderD．deadcenter160.Enginefuelpumpindexis_____.A．theviscosityindexB．thefueloilcontentsC．thestartingspeedD．thereadingattherack√161.Excessiveclearancesinthemainorcrank-pinbearingswillsometimesbeindicatedby_____beforeanybearingknockisheard.A．lossofflowinthefuelsystemB．lossofpressureintheairsystemC．lossofflowinthelubricatingsystemD．lossofpressureinthelubricatingsystem√162.Exhausttemperatureincreasesinallcylinders,thepossiblecausemaybe_____(1)increasedscavengingairtemperature,(2)airinfuelpumpsandfuelvalves,(3)foulingofairandgaspassages.A．(1)+(2)B．(1)+(3)√C．(2)+(3)D．(1)+(2)+(3)163.Expansiontanksh