《轮机英语》二三管轮考证必备

第一章船舶动力装置“Beforedisconnectingtheoilpipe,wouldyouflushtheoilretainedinthepipe?”askedtheoilbargeowner.

A．byusingoffreshwater

B．withcompressedair√

C．byusingofseawater

D．withchemicalcompound“Standbyanengine”means_____.

A．“preparetostoptheengine”

B．“assembleanengineonitsbedplate”

C．“makeanenginereadyforstarting”√

D．“dismantleanengine”A_____isthefoundationoftheengine,withoutthesupportofwhichtheshaftalignmentinparticular,andenginestructureasawhole,wouldinevitablybelost.

A．Frame

B．Bedplate√

C．Cylinder

D．Liner_____arecommonlyusedinmechanical-hydraulicgovernortosenseenginespeeds.

A．Bulbs

B．Bulks

C．Flyweights√

D．Flywheels_____aregenerallyformedintheframeofthebothin-lineandVeeenginestogivemaintenanceaccesstothecrankshaftmainandconnectingrodlargeendbearing.

A．Doors√

B．Aspirategauzer

C．Coupling

D．Blind_____deviceisprovidedtopreventstartingairfrombeingadmittedtothecylinderbeforethereversingiscompleted.

A．Anautomatic√

B．Atransmission

C．Aself-regulating

D．Aninterlocking_____fueloils_____lubricatingoilsrequiretreatmentbeforepassingtotheengine.

A．Both/and√

B．Neither/nor

C．Either/or

D．Both/or_____issometimesusedforpistoncoolingsinceleaksintothecrankcasewouldnotcauseproblems.

A．Dieseloil

B．Hydraulicoil

C．Lubeoil√

D．Mineraloil_____istheremovalofexhaustgasesbyblowinginfreshair.

A．Gasexchange

B．Charging

C．Scavenging√

D．Supercharging_____isusedforcylinderandcylinderhead,thesaltwaterisusedforcoolingthelubricatingoil,thefreshwaterinthecoolersandthechargingairintheaircooler.

A．Thefueloil

B．Thelubeoil

C．Theseawater

D．Thefreshwater√_____maybethefirstpossiblecausewhichmakestheenginetolosepowerorslowdownwhenitisrunning.

A．Hotbearing√

B．Startingvalves

C．Unequaldistributionofload

D．Excessivecrankshaftclearance_____ofanenginecrankshaftcanbedetectedbymeasuringdeflectionsofcrankwebsforeachunitoftheengine.

A．Misalignment√

B．Length

C．Strength

D．Stresses_____oftheA-framesthereisastrongcastironframecalledthescavengingairbox.

A．Atthetop√

B．Atthebottom

C．Inthetop

D．Inthebottom_____pistonshavelowinertiaandhighcoefficientofthermalexpansion.

A．Castiron

B．Caststeel

C．Forgedsteel

D．Aluminum√_____shouldnotundertakeanytaskwhichwillinterferewiththesupervisiondutiesrelatingtothemainmachineryandassociatedequipment.

A．Thewatchkeepingpersonnel√

B．Thechiefengineer

C．Thepersononabunkerbarge

D．Anyoftheabove_____thecylinderwillcontainagreatweightofairandwillbecapableofburningagreatquantityoffuel.

A．Atthebeginningofthecompressionstroke√

B．Atthebeginningofthesuctionstroke

C．Attheendoftheworkingstroke

D．Attheendoftheexhauststroke_____thesuperchargepressureis,_____poweranenginedevelops.

A．Thehigher/themore√

B．Higher/more

C．Higher/little

D．Thehigher/theless_____isnotproperlysetthuscausingeitheradvancedorretardedfiring.

A．Apiston

B．Afuelinjectionpump√

C．Afeedwaterpump

D．Alubeoilpump_____rodsarenotinproperconditionsothattoomuchfuelissuppliedtothecorrespondingcylinder.

A．Piston

B．Sounding

C．Regulating√

D．Connecting_____shows1.2meterandthespecificgravityoftheoilis0.96Accordingtothemeasuringscale,thatmakes150tons.

A．Thepistonrod

B．Thepushrod

C．Thesoundingrod√

D．Theconnectingrod_____allowsforexpansionandwatermakeupinthewatercoolingsystem.

A．Atoptank

B．Aheadtank√

C．Aheadvalve

D．Adraintank_____attheendofthedistributionpipeensuresthatadequatepressureismaintainedbythepump.

A．Areliefvalve

B．Analarm√

C．Apressuregauge

D．Anon-maimvalve_____isusedforwashinganddrinking.

A．Theballastsystem

B．Thesaltwatersystem

C．Thebilgesystem

D．Thedomesticsystem√_____providethewatertothepistons.

A．Pneumaticpipes

B．Hydraulicpipes

C．Telescopicpipes√

D．Operatinggaspipes_____arefittedintheexhaustsystemandfacilitatechargeremovalandscavengingineachcylinder.

A．Diffusers√

B．Compressors

C．Steamboilers

D．Sootblowers_____areformedbyabrasiveparticlesenteringthebearingandscoringtheshaft.

A．Grooves√

B．Recesses

C．Ridges

D．Nips_____aremountedonandboltedtothebed-platecrossgirders.

A．Thecrankshaft

B．Thecrankcase

C．Theguide-ways

D．Theframes√_____isaprecautionwhichcontributestoavoidingtroubleundernormaloperatingconditions.

A．Constantinspection√

B．Keepingconstantload

C．Remainingconstanttemperature

D．varyingspeed_____isasourceofpowerbywhichthedieselenginemayoperate.

A．Waterenergy

B．Electricalenergy

C．Chemicalenergy

D．Heatenergy√_____isarrangedforcleaningthelubricatingoilinthesystemandcleanoilcanbeprovidedfromastoragetank.

A．Afilter

B．Acentrifuge√

C．Adistiller

D．Agenerator_____isfullyfloatinginbothconnectingrodsmallendandthepistonskirt.

A．Thepistonrod

B．Thecrossheadpin

C．Thegudgeonpin√

D．Thecrank-pin_____ismadeofabosswithseparatedbladesmountedintoit.

A．Avariablepitchpropeller√

B．Avariablepitchnut

C．Afixedpitchparallel

D．Afixedpitchscrew_____isusuallydrivenbytheenginecamshaftandsuppliespilotairtothecylinderairstartvalve.

A．Anairreceiver

B．Anoperatingvalve

C．Anautomaticvalve

D．Anairdistributor√_____neutralizestheacidconditionsand_____cleansestheringsandgrooves.

A．Thedetergency/thealkalinity

B．Thealkalinity/thedetergency√

C．Theinhabitant/thewater

D．Theadditives/thedistilledwater_____orairventingarrangementisfittedtothefuelsupplypassage.

A．Anairpump

B．Acompressor

C．Afuelpump

D．Apriming√_____providinglubricatingfilms,oilusedinmarinedieselengineshavetoremoveheatfromoilcooledpiston.

A．Exceptfor

B．Beside

C．Except

D．Inadditionto√_____theengines,thedieselengineis_____usedengineonboard.

A．Between/morecommonly

B．Among/themostcommonly√

C．Between/notmorecommonly

D．Among/notthemostcommonly_____waterismoreexpensivethanfreshwaterIthashighspecificheatandlowviscosity.

A．Distilled√

B．Distilling

C．Boiling

D．Boiled_____forthecamshaftgeartrainistakenfromaspurgearwhichforasixcylinderengineisatthecouplingend.

A．Thedrivengear

B．Thedrive√

C．Thegrease

D．Thelubricatingoil_____inwhatpositiontheenginestopstherewillalwaysbeatleastoneofthecylinderswithitsstartingairvalveopentoadmitcompressedairtostarttheengine.

A．Because

B．Owingto

C．For

D．Nomatter√_____issecuredbymeansofside-chockboltsandend-chockbolts.

A．Thebedplate√

B．Thecolumn

C．Themainbearing

D．Thedoublebottom_____usuallyhelpstoinduceairmovementtoassistcombustion.

A．Cylindercover

B．Mainbearing

C．Theexhaustvalve

D．Thepistonmovement√_____mayhavetwoemergencysourceofpower,thusrequiringtwoemergencyswitchboards.

A．Largepassengervessels√

B．Generalcargoships

C．Containerships

D．Oiltankers_____suppliespilotairtocontrolthecylinderairstartvalves.

A．Anaircompressor

B．Anindicatorcock

C．Anairdistributor√

D．Asafetyvalve_____clearancesinthemainorcrankpinbearingswillsometimesbeindicatedbylossofpressureinthelubricatingsystembeforeanybearingknockisheard.

A．Toolarger

B．Toosmaller

C．Excess

D．Excessive√Acaststeelstrongbackisfittedinwayofthecombustionspacetohelpabsorb_____.

A．flametemperature

B．fueloil

C．airmovement

D．gasforces√Achargeoffreshairisdrawnintotheenginecylinderandthen_____bythemovingpiston_____veryhighpressure.

A．pressed/to

B．pressurized/with

C．pushed/in

D．compressed/to√Acommontroublewiththefuelpumpplungerorfuelvalvespindleis_____.

A．waterleakage

B．steamleakage

C．oilleakage√

D．airleakageAcommontroublewiththefuelpumpplungersorfuelvalvespindleis_____.

A．brokendown

B．stuck

C．oilleakage√

D．carbonizedAdieselengineissimilartoagasolineengineexceptthattheformerhasno_____.

A．cross-head

B．cylinder

C．connectingrod

D．sparkplug√AdieselenginescrankcaseoillevelisfoundtobetoohighYoushouldsuspectthat_____.

A．theenginewasoverfilled

B．theremightbeafuelleak

C．theremightbeawaterleak

D．alloftheabove√Adistancepiece,knownasa_____maybeinterposedbetweentherodandthebearinghousing.

A．bearingshell

B．bearingliner

C．compressionplate√

D．leadwireAdistancepiece,withgroundfaces,knownasacompressionplate,maybeinterposedbetweentherodandthebeatinghousing,itsthicknessbeingchosentoensurethecorrect_____.

A．compressionpressure

B．compressiontest

C．compressionratio√

D．compressionclearanceAdistancepiece,withgroundfaces,maybeinterposedbetweentherodandthebearinghousing,itsthicknessbeingchosentoensurethecorrect_____.

A．expansionratio

B．pressureratio

C．compressionratio√

D．clearanceratioAgovernorautomaticallycontrolsenginespeedbyregulating_____.

A．fuelsupply√

B．firingorder

C．engineload

D．oillevelAgudgeonpininatrunkpistonmaybefreetofloatandrotate,with_____tolimitaxialmovement.

A．splitpins

B．crankpins

C．dipsticks

D．circlips√Aheaterinthecircuitfacilitateswarningoftheenginepriorto____bycirculatinghotwater.

A．starting√

B．stopping

C．tostart

D．tostopAhightemperaturealarmor_____whichwillmeltisusedtoguardagainsttheexplosionofcompressorairpipelines.

A．aflametrap

B．areliefvalve

C．afusibleplug√

D．aburstingcapAhotairstartpipeindicatesthatthereis_____.

A．inefficientcooling

B．aleakingairstartvalve√

C．acloggeddrainvalve

D．aleakingairbottleAlevelgaugeforatankisto_____.

A．givethepressure

B．givethecontents√

C．givetheshapeofthetank

D．givetheaccuracylevelAlubricantoftenhastoperformmanydutiesinanysituation,inadditiontoitsfundamentaljobof_____.

A．resistingoxidization

B．reducingfriction√

C．promotingmovingspeed

D．developinginertiaAmainbearingconsistsoftwoshellswhicharesecuredbymeansofstudsand_____.

A．tierods

B．throughbolts

C．leadwires

D．bearingcaps√Anumberofcylinderlinersareenclosedinonecastironcasingtoforma_____.

A．cylindercover

B．cylinderblock√

C．cylinderframe

D．bed-plateAreductioninloadonadieselengineresultsin_____ofspeedofthecrankshaft.

A．areduction

B．anincrease√

C．anouting

D．adownwardsAseparatepistoncoolingsystemisused_____anycontaminationfrompistoncoolingglandstothepistoncoolingsystemonly.

A．tohelp

B．tolimit√

C．toprotect

D．toremoveAseparatepistoncoolingsystemisusedtolimitanycontamination_____pistoncoolingglands_____thepistoncoolingsystemonly.

A．between,to

B．either,or

C．from,to√

D．neither,norAsinglepiece_____fittedwithbronzeringsguidesthepistoninthecylinderliner.

A．pistonskirt√

B．pistoncrown

C．guideway

D．cross-headAvariablepitchpropellerismade_____abosswithseparatebladesmountedintoit.

A．of

B．upof√

C．from

D．outA:PleasetellmethespecificationsandquantityB:_____.

A．Pumpdieseloilfirst

B．300tonsof180cstfueloil√

C．Thefigureisallright

D．OK,I’llsignitAbouthalfanhourbeforetheengineisrequired,coolingwaterat_____mustbecirculated.

A．morethantheworkingtemperature

B．lessthantheworkingtemperature

C．theworkingtemperature√

D．thesameasthesurroundingtemperatureAccordingtothewaytheenergyoftheexhaustgasesisutilized,pressure-chargingcanbedividedintotwomainsystems,namely,theconstant-pressuresystemand_____.

A．thepulse-phasesystem

B．thepulseDopplersystem

C．thepulsesystem√

D．thepulseintervalAcidsolutioninthesystemcanbetestedfromtimetotimebyputtingsomeontoapieceoflime.

A．strength√

B．dense

C．percentage

D．velocityAdditives_____protectivelayersonmetalsurfacesguardingthemagainstcorrosion.

A．damage

B．form√

C．dissolve

D．contaminateAdjust_____bymeansofleadwire.

A．theclearanceofthemainbearing√

B．thediameterofmainbearing

C．thegapofmainbeating

D．thetoleranceofmainbearingAdministrationsshouldbearinmindthesignificanceof_____inmaintainingsafetyoflifeandpropertyatseaandinpreventingmarinepollution.

A．advancednauticalequipment

B．advancedperformancemainengines

C．emergencyequipment

D．communicationandlanguageskills√A-framesandcylinderblockisheldtogetherby_____toformarigidstructure.

A．connectingrods

B．pistonrods

C．tierods√

D．jack-boltsA-framesaremountedonthebedplateandsupport_____andcylinderblock.

A．themainbearing

B．thecylindercover

C．theentablature√

D．thesumpAfter"F.W.E."isgiven,theairsystemisshutdown,the_____gearputin,alldrainsandindicatorcocksopened,andthecoolingwaterkeptrunning.

A．steering

B．timing

C．turning√

D．runningAfterensuringthatthe_____iscorrectthebearingclearanceshouldbechecked.

A．nap

B．gap

C．nip√

D．deflectionAfterfittingbackinplacethegearwheels,dontforget_____them.

A．togrease√

B．greasing

C．oiling

D．lubricatingAfterpassingthroughtheturbinetheexhaustgasisconductedoutintothe_____.

A．intercooler

B．compressor

C．cylinder

D．openair√Aftertheengineiswarned,weshould_____theturninggearbeforestartinguptheengine.

A．takein

B．putin

C．takeout√

D．putupAftertheorder“_____”isgiven,theairsystemisshutdown,theturninggearputin.

A．FinishedwithEngine√

B．StoptheEngine

C．Stand-byEngine

D．Slow-downEngineAircocks,usuallypositionedatthe_____inacirculatingsystem,isusedtogetridoftheairinthesystem.

A．bendingjoint

B．expansiontank

C．weld

D．thehighestpoint√Alltheringsareslightlyroundedontheirexternaltopandbottomedgestokeeptheoilfilmonthecylinderlinerduring_____fornewpistonrings.

A．therunning-inperiod√

B．therunningprocess

C．gasexchangeprocess

D．theboilerfiringAllthreesystemshavetheports_____toswirltheincomingairanddirectitintheappropriatepath.

A．angled

B．rounded

C．beingangled

D．beingrounded√Althoughthecrankshaftsofmediumdieselenginesappeartoberobust,theyrelyonthesupportof_____todeveloptheirfullstrength.

A．thepistonrods

B．thecrankthrows

C．thethrustbearings

D．themainbearings√Aluminumpistonshave_____coefficientofthermalexpansioncomparedwiththoseofcastiron.

A．higher√

B．lower

C．thesame

D．noneoftheaboveAmongtheringsofapistonthe_____oneissubjectedtothegreatestloadandtemperature.

A．bottom

B．middle

C．top√

D．noneoftheaboveAnaluminumpistonhaslowerinertiaandhighercoefficientof_____comparedtothatofcastiron.

A．viscosity

B．twistingmoments

C．inertia

D．thermalexpansion√Anelectricallydrivenautomaticallyoperatingauxiliaryblowerisprovidedforslowspeedand_____ofalowspeeddieselengine.

A．manoeuvringoperations√

B．badcombustion

C．cooling

D．mooringtrialAnincreaseinloadonadieselengineresultsin_____ofspeedofthecrankshaft.

A．areduction√

B．anincrease

C．anouting

D．adownwardsAninterlockintheremoteoperatingvalvelinestopsthevalve_____whentheengineturninggearisengaged.

A．toopen

B．opening√

C．open

D．openedAnoverspeedsafetydeviceisusuallyfittedtoageneratorenginefor_____intheeventofoverspeed.

A．cuttingpowerofftheengine√

B．increasingthefuelpumpsetting

C．brakingthecrankshaft

D．stabilizingtheshipspeedAsaheatengine,_____energyisthesourceofpowerbywhichthedieselenginecanbeoperated.

A．electric

B．heat√

C．mechanical

D．exhaustAsforadieselengine,lackofcombustionairmaybedueto_____.

A．foulingturbine√

B．fuelpumpfaults

C．lubricationfailure

D．excessivecoolingAstheplungermovesup,theportsareclosedandthefuel_____anddeliveredtotheinjectornozzleatveryhighpressure.

A．beingcompressed

B．tobepumpedup

C．ispressurized√

D．arebuiltupAtleast_____cylindersinfour-strokeenginewillbeconfiguredtoensurethattheenginecanbestartedwiththecrankshaftatwhateverposition.

A．6√

B．2

C．12

D．8AtthetopoftheA-framesthereisastrongcastironframecalled_____.

A．cylinderliner

B．cylindercover

C．thegearbox

D．thescavengingbox√Besuretomaketheengineturnby_____beforestartingandafterstopping.

A．steeringgear

B．turninggear√

C．steeringwheel

D．turningcycleBearingknocksarelikelytooccurfrom_____.

A．lessclearance

B．dirtylubeoil

C．overload

D．bearingwear√Becausethecastingsofsmallerenginesarenotsobigandheavy,_____andcylinderblockmaybemadeinonepiece.

A．thecolumn√

B．thejacket

C．cylindercover

D．cylinderlinerBedplatesarethe_____oftheengine,withoutthesupportofwhichtheshaftalignmentinparticular,andenginestructureasawhole,wouldinevitablybelost.

A．hull

B．projection

C．graphitization

D．foundation√Before"stand-by"isrungontheenginetelegraph,itisusualtogivethemainengine_____aheadandastern.

A．abrieftrialwithturninggear

B．abrieftrialonpower√

C．alongtrialbysteeringgear

D．oneminutestrialwithwindlassBeforeamarinedieselengineisstartedthecylindersandpistonsmustbe_____.

A．cooledtoappropriatetemperature

B．warmedupgraduallytoappropriatetemperature√

C．openedupandrenewed

D．groundandpolishedBeforebeingusedthefuelservicetankshouldbedrainedof_____.

A．sodasolution

B．mechanicalimpurities

C．ballast

D．waterandresiduals√Beforepumpingupthecrankcaseoil,_____shouldbeworkedbyhandtominimizecorrosiveactionontheliners.

A．theindicators

B．thestartingvalves

C．thecylinderlubricators√

D．theturninggearBeforereplacingapistonyoushouldcheckthatallringsare_____.

A．free√

B．fastened

C．broken

D．stuckBeforereplacingapistonyoushouldchecktheringstoseethatallclearancesandgapsare_____thepermissibletolerances.

A．above

B．at

C．over

D．within√Beforereplacingapistonyoushouldchecktheringstoseethatallclearancesandgapsarewithinthepermissible_____.

A．deflection

B．discrepancy

C．error

D．tolerance√Beforestartingtheenginetheairbottleshouldbe_____.

A．pumpedup√

B．loaded

C．discharged

D．openedBeforestartingtheturninggear,_____shouldbeworkedbyhandtominimizecorrosiveactionontheliners.

A．theindicators

B．thestartingvalves

C．thecylinderlubricators√

D．theturninggearBlow-offofthereliefvalvesoftheenginescylindersmaybecausedby_____.

A．toolowlead

B．waterinfuel

C．tootightspring

D．leakage√Blow-offofthereliefvalvesofthemaincylindersduringoperationindicates_____.

A．thecylindercoveriscracked

B．theinjectorholesisclogged

C．thecamsarenotproperlyset√

D．fuelpumpisleakingBridgegaugecanbeusedtomeasure_____ofadieselengine.

A．diametersofjournals√

B．deflectionsofcrankwebs

C．diametersofcrankpins

D．noneoftheaboveCareandcleanlinessarerequiredwheninstallingdieselfuelfilters_____.

A．topreventthefuelsystemfrombecomingair-hound

B．topreventthefuelsystembecomingcloggedwithdirtyparticles

C．bothoftheabove√

D．topreventthelubricatingoilfromleakingoutofthefilterelementCastironcarrierrings,_____machinedgrooves,areprovidedforallthepistons.

A．caulkedinto√

B．caulkinginto

C．pressedinto

D．screwedintoChargingisthefillingoftheenginecylinderwithasupplyof_____forcompression.

A．water

B．freshair√

C．fueloil

D．gasChargingisthefillingoftheenginecylinderwithasupplyorchargeoffreshair_____compression.

A．toneed

B．readyfor√

C．wantto

D．goingtobeCharging-airpressureincreasesifthereisincorrectcombustionanddropinthe_____ofthedieselengine.

A．machineefficiency

B．machineryefficiency

C．mechanicalefficiency√

D．mechanicsefficiencyCompressedairissuppliedbyaircompressionto_____.

A．theairreceivers√

B．thestartingvalves

C．thecylindercovers

D．thedistributorsCompressedairisusedonboardship_____.

A．forstartingdieselengines

B．inpneumaticcontrolsystem

C．inpneumatictools

D．Alltheabovearetrue√Constantcoolingthevariouscomponentsofdieselenginehasanumberoffunctionsexceptfor_____.

A．goodlubrication

B．lowthermalstress

C．goodmechanicalproperties

D．acidcorrosion√Coolingenablestheenginemetals_____theirmechanicalproperties.

A．toretain√

B．toremain

C．tomaintenance

D．tohaveCoolingofengineisachievedbycirculationacoolingliquidaroundinternalpassageswithinthe_____.

A．boiler

B．heater

C．engine√

D．coolerCoolingofenginesisachievedby_____acoolingliquidaroundinternalpassageswithintheengine.

A．flowed

B．flowing

C．mixing

D．circulating√Coolingofenginesisachievedbycirculatingacoolingliquidaroundinternal_____withintheengine.

A．air

B．passages√

C．pipes

D．meansCracksincylinderandcylindercoversmay_____fromunequalheating.

A．make

B．cause

C．result√

D．produceCracksinthecylindersandcylindercoversmay_____unequalheating.

A．resultfrom√

B．resultin

C．giveout

D．givenfromCracksinthecylindersandcylindercoversmayresultfrom_____.

A．lowspeed

B．unequalheating√

C．lesslubricating

D．lowchargeairpressureCrankshaftsofmediumspeedenginesare_____fromasinglepieceofsteel.

A．unusuallysolidwelded

B．neverbesolidforged

C．almostinvariablysolidforged√

D．almostinvariablybeweldedCrossscavengingrequiresthefittingof_____topreventairorexhaustgasescapewhenthepistonisatthetopofthestroke.

A．aexhaustvalve

B．apistonskirt√

C．apistoncrown

D．anairsuctionvalveCylinderlinercoolingisoftenreferredtoas_____.

A．pistoncooling

B．sleevecooling

C．centralcooling

D．jacketcooling√Cylindersofmarinedieselenginesarenormallycooledby_____.

A．seawater

B．finemineraloil

C．sanitarywater

D．freshwater√Dieselenginesarestartedbysupplying_____intothecylindersintheappropriatesequencefortherequireddirection.

A．coolingwater

B．compressingair

C．compressedair√

D．cylinderoilDieselenginesarestartedbysupplying_____intothecylindersintheappropriatesequencefortherequireddirection.

A．fueloil

B．dieseloil

C．compressedair√

D．jacketwaterDieseloilmaybeusedtocool_____ofadieselengine.

A．cylinders

B．exhaustvalves

C．pistons

D．fuelvalves√Dirtinthefueloilsystemofadieselenginecancause_____.

A．cloggedfilters√

B．poorcombustion

C．overloadingofthediesel

D．shockoffuellinesDirtyoilmustbe_____beforebeingusedagain.

A．mixedwithcleanoil

B．purified√

C．heated

D．strainedDoorsaregenerallyformedinthe_____ofthebothin-lineandVeeenginestogivemaintenanceaccesstothecrankshaftmainandconnectingrodlargeendbearing.

A．bedplates

B．columns√

C．cylinderblocks

D．safetycapsDueto_____actionofpistonssomerelativemotionbetweenpartsincontactinthecoolantsupplyandreturnsystemmustoccur.

A．reciprocating√

B．rotating

C．running

D．removingDuring_____,thestartingairvalvesshouldbeclosedtopreventtheenginefromturning.

A．overhaul√

B．running

C．blowingdown

D．AlloftheabovearecorrectDuringrepair,lubricationlinesandorificesmustbe_____.

A．takenaway

B．engaged

C．connected

D．sealedoff√Duringtheinspection,thestartingairvalvesshouldbeclosed_____theenginefromturning.

A．toincrease

B．tospeedup

C．toprevent√

D．toreduceDuringthesuctionstroke,thepistonismoving_____.

A．inwards

B．outwards

C．downwards√

D．upwardsDuringworking,whenthepistonisnearthe_____,theairignitesthefinesprayoffuel.

A．TDC√

B．DTC

C．BDC

D．BCDEachcrankismadeupoftwocrankwebsjoinedbyacommon_____towhichthebottomendbearingisfitted.

A．throw

B．crankshaft

C．crankpin√

D．crossheadEachcylinderhasonestartingvalvewhichisusuallyopenedbyairpressureandclosedby_____.

A．nutsandbolts

B．newjoints

C．springforce√

D．sealingringsEachcylinderisclosedatthetopbya_____,madeofaspecialheat-resistantsteel.

A．cylinderliner

B．couplingflange

C．cylindercover√

D．pistoncrownEachcylinderlineronthemarinemediumspeedengines_____.

A．isusuallycooledbyseawater

B．canbereplacedwhenwornout√

C．isindirectcontactwiththewaterintheboreofthecylinder

D．cantexpandwhenheatedEachjournalandpinshouldbeexaminedfor_____andgrooving.

A．bridges

B．recesses

C．rears

D．ridging√Eachpistonstuffingboxisprovidedwithtwosealingringsandthree_____.

A．packings

B．pistonrings

C．distributorrings

D．scraperrings√Eitheralowinjectionpressureoraleakageofpistonringsisabletolead_____.

A．ahighexhausttemperature

B．ahighsmokyexhaust√

C．ahighoutput

D．ahighcompressionEmulsionoilsandsodiumnitritearebothapprovedadditives,butthelattercannotbeusedifanypipesare_____orifanysolderedjointsexit.

A．chromed

B．welded

C．galvanized√

D．boltedEmulsionoilsandsodiumnitritearebothapprovedadditives,but_____cannotbeusedifanypipesaregalvanizedorifsolderedjointsexist.

A．thelatter√

B．latter

C．former

D．theformerEnergylossesdueto_____occurineverymachine.

A．speed

B．friction√

C．impact

D．atmosphereEngagetheflywheelwiththe_____.

A．turninggear√

B．motor

C．drivinggear

D．drivengearEngine_____referstotherelativetimeofpositionofcrank,atwhicheachoperationduringthecycleiscommencedandiscompleted.

A．timing√

B．deviation

C．firingorder

D．phaseEngine_____referstotherelativetimeofpositionofcrank,atwhi