轮机英语关联题Word下载.docx
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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.
Thesolenoidvalvei