轮机英语关联题.docx

轮机英语关联题.docx

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轮机英语关联题

轮机英语关联题

第四章关联题79题

Passage1

Valvedrivemechanism

Thevalvedrivemechanismcommandstheinletandexhaustvalvesattherequiredtiming.

Thevalvedrivemechanismconsistsofaninletandexhaustcamfollower（8）eachsuspendedinaplungerofthetappetassembly（7）,twotubularpushrods（4）withballjoints,twonodularcastironrockerarms

（2）suspendedinarockerarmbearingbracket,twoyokes（5）andayokeguidepins.SeeFig.4-1.

Thetappetrollersfollowthecamprofilesandtransferthemovementsthroughpushrodstotherockerarms.Therockerarmsoperatetheinletandexhaustvalvesthroughyokes（5）.Lubricationfortherockerarmscomesfromtheengine'ssecondaryoilsupplymanifoldthroughdrillingsinthecylinderheadandrockerarmbracket.

Thetappetassemblyreceiveslubricatingoilviachannelsintheengineblockfromthemainsupplymanifold.Fortherollerandshaft,theoilissuppliedthroughtheguidingplunger.

Tocompensateforheatexpansionaclearancemustexistbetweentherockerarmandyoke.Alladjustmentshavetobedoneonacoldengineonly.

Fig-4-1Valvedrivemechanism

1.Accordingtothepassage,thebesttimetoadjustthevalveclearanceis_____.

A.beforetheengineisstartedB.whentheengineisrunning

C.aftertheenginehasjustbeenstoppedD.whensomethinghasgonewrongwiththeengine

2.Therollerandthetappetassemblyarelubricatedbymeansof________.

A.themainlubesystemB.thesecondaryoilsystem

C.thespecialpumpingsystemD.theturbineoilsystem

3.Accordingtothepassage,thevalvedrivemechanismdoesnotinclude________*

A.tappetrollersB.pushrodsC.nodularcastironD.yokesandguidepins

4.Toclosevalvestightly,whichclearanceshouldbeinspectedaccordingtothemaintenance

schedule?

A.Theonebetweenthecamandthetappetroller.

B.Theonebetweenthepushrodsandtheballjoints.

C.Theonebetweentherockeraimsandtheyoke

D.Theonebetweentwotubularpushrods.

AACC

Passage2

Chargeaircooler

Theengineisequippedwithachargeaircooler.Theinserttypechargeaircoolerismountedinaweldedcasing（airtrunk）.Thetrunkisboltedtotheengineblock.

Standardisatwo-stagecoolermounted.Thefirststage,throughwhichthechargeairflows,iscooledwithwaterfromtheHTcoolingsystemandcoolsthechargeairtillapprox.90–100℃.ThesecondstageissuppliedwithwatercomingfromtheLTwatersystemandcoolsthechargeairfurthertilltherequiredtemperatureofapprox.50℃.BycontrollingthewaterflowthroughtheLTcoolerthechargeairtemperaturecanbekeptconstantattherequiredtemperature.

Thecirculatingcoolantwatershouldalwaysbeunderpositivepressureandshouldbeascleanaspossible.Theoperatingairtemperatureshouldbemaintainedbycontrollingthecoolantinlettemperature.

Whilsttheengineisrunningtheairandcoolanttemperaturesandpressuresatinletandoutletshouldbecheckedandloggedperiodically.Variationsfromnormalindicatefaultsdevelopingsuchasfoulingofthefilmplatesorobstructionofthewatertubes.

Checkdaily,duringoperationoftheengine,theworkingofthetelltaleholeatthefreeendofthechargeairreceiver.Thefunctionofthisholeistoinformtheoperatorthepresenceofwaterinthechargeairreceiver.Undernormalconditiononlycompressedairshouldescapefromthishole.

1.Accordingtothepassage,theexpression"HT"probablymeans________.

A.HIGHTANKB.HIGHTEMPERATURE

C.HEATTRANSMISSIOND.HEATTRANSFER

2.Inordertomaintainthechargeairtemperatureweshouldcontrol________.

A.thecoolantinlettemperaturecomingfromthefirststagecooler

B.thecoolantflowcomingfromthesecondstagecooler

C.thecoolantoutlettemperaturecomingfromthesecondstagecooler

D.thecoolantflowcomingfromthefirststagecooler

3.Thechargeairtemperaturedepartingfromnormalmayindicatethat_____

A.condensatecanbeformed

B.onlycompressedairshouldescapefromthetelltale

C.thefilmplatesarebecomingdirtyorthewatertubesareblockedbyscale

D.coolingwatermayhavebeencarriedintothecylinders

4.Thefunctionofthetelltaleholeisto________.

A.detectwhethercompressedairhasescapedfromthehole

B.controlthecoolantinlettemperature

C.determinewhetherthecoolantwaterisunderpositivepressure

D.informtheoperatorthepresenceofwaterinthechargeairreceiver

BBCD

Passage3

Startingairsystem

Theengineisstartedwithcompressedairofmax30bar.Minimumpressurerequiredis15bar.ApressuretransmitterPT301mountedonthestartingairlinebeforethemainstartingvalvehasanindicatorintheinstrumentpanel.Thesupplylinefromthestartingairbottlesisprovidedwithanonreturnvalveandadrainvalve.

Thesolenoidvalveiselectrical（remotecontrol）ormanual（ontheengine）operatedandsendafteractivationapilotairsignaltothemainstartingairvalve.Interruptionofthecontrolairdosesthemainstartingairvalve.

Afterthemainstartingairvalveisactivatedtheairflowsthroughtheflamearresteretothestartingairvalvesinthecylinderheads.Partoftheairflowsviathestartingairdistributortoeachofthestartingairvalvesinthecylinderheads.Thestartingairdistributorcontrolsthetimingofopeningandclosingofthestartingairvalves.Onthemomentthemainstartingairvalveisoperatedalsothegovernorboosterisenergized.Themainstartingairlineisprovidedofasafetyvalve.Interlockvalveisasafetydevicetoavoidanenginestartwithengagedturninggear.

1.Astheengineisstartedwithcompressedair,thecorrectsequenceofthefollowingdevicesbeing

activatedis________.

①solenoidvalve;②startingairvalve;③startingairdistributor;④mainstartingairvalve;

⑤governorbooster.A.①,⑤,④,②,③B.①,④,⑤,③,②C.①,④,③,②,⑤D.④,③,①,②,⑤2.Thesentence"thegovernorboosterisenergized"（paragraphs）probablymeans________.

A.thegovernorboosterissuppliedwithelectricpower

B.hydraulicoilispumpedintothegovernorbooster

C.thegovernorstartstoworkbeforestartingtheengine

D.thegovernorboosterissuppliedwithpressurizedairbeforestartingtheengine

3.Whichofthefollowingcomponentsareattachedtotheairbottles?

A.apressuretransmitterFT301B.anon-returnvalveandadrainvalve

C.asolenoidvalveD.astartingairdistributor

4.Whentheengineisengagedwithturninggear,________cankeeptheenginefromstarting

A.thecontrolairB.thesolenoidvalve

C.themainstartingairvalveD.theinterlockvalve

BDBD

Passage4

Startingairdistributor

Thestartingairdistributorisofthepistontypewithprecisionmachinedinterchangeableliners.

Thelinersaswellasthepilotpistonsareofcorrosionresistantmaterials.Thepilotpistonsarecontrolledbyacamconnectedtothecamshaftend.Whenthemainstartingvalveopens,thepilotpistonsarepressedontothecam,wherebythepilotpistonfortheenginecylinderwhichisinstartingpositionadmitscontrolairtothemainpistonofthestartingvalve.Thestartingairvalveopensandadmitscompressedairintotheenginecylinderforcingthatpistondown.Shortlybeforetheexhaustvalvesareopenedthepilotvalveinterruptsthecontrolairtothestartingairvalveandstartingairtothatcylinderisstopped.Thisprocedurewillberepeatedaslongasthemainstartingvalveisactivatedoruntiltheenginespeedissohighthattheenginefires.Afterthemainstartingairvalveisclosed,themainstartingairsystemisde-aerated,thepressuredrops

quicklyandthespringswillliftthepilotplungersoffthecam.Thismeansthatthepilotplungerstouchthecamonlyduringthestartingprocessandthuswearisinsignificant.

Ifapilotlineriswornout,pressitout.Itmaybenecessarytoheatthedistributoruptillabout200oCas"Loctite"isusedforfixingandsealing.

1.Accordingtothepassage,thelinersofthestartingairdistributor________.

A.canbereplacedwhenwornoutB.aremadeofheatresistantmaterials

C.areweldedpreciselyD.arewornouteasilyduringthestartingprocess

2.Duringthestartingprocess,when________,themainstartingairvalveisclosed.

A.theexhaustvalvesinthestartingcylinderareopened

B.thepilotairtothestartingairvalveisstopped

C.theenginespeedreachesfirespeed

D.thepilotpistonsarepressedontothecam

3.Whensomecylinderoftheengineadmitscompressedairintoit,thepilotpistonofthestartingair

distributorshouldbe_________.A.separatedfromthecamB.pressedontothecamC.liftedoffthecamD.pressedontothecamrepeatedly

4.Fromthepassageweknowthat"Loctite"isprobably________.

A.atypeofgasketB.akindoflubricant

C.agluebondD.ananti-corrosionadditive

ACBC

Passage5

Theengine'ssupportingelementconsistsofabedplateandframe.Thebedplatecanbeofweldedorcastdesign.Theframeismadeofcastiron.Theturbochargermounting,thehousingfortheaircoolerandthechargingairreceiverarecastasanintegralpartoftheframe.Theunderslungcrankshaft'smainbearingsaremountedinboresintheframeandsecuredwithmainbearingcapsofsteel.Thecapsareguidedsidewaysandaresecuredbymeansofthreadedstudsandnutsthataretightenedhydraulically.

Thecapsarealsosecuredwithhorizontalbracingscrewsintheframe.

Thebearingshellsareproducedwithatolerancethatmakesitpossibletochangethemasetatatimewithoutanyscraping-in.

Thetopflangesofthecylinderlinersareforcedagainstthetopfaceoftheframebythecylindercovers,whereasatthebottomth