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