轮机英语关联题轮机长大管轮new.docx
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轮机英语关联题轮机长大管轮new.docx
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轮机英语关联题轮机长大管轮new
关联题(173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,whichclearanceshouldbeinspectedaccordingtothemaintenanceschedule?
A.Theonebetweenthecamandthetappetroller.
B.Theonebetweenthepushrodsandtheballjoints.
C.Theonebetweentherockeraimsandtheyoke
D.Theonebetweentwotubularpushrods.
AACC
Passage2
Compressorcleaningduringengineoperation
Thecompressormaybecleanedbywaterinjectionduringtheengineoperation.Thecleaningprocesswillhavegoodresultsaslongasthedepositformationhasnotgonetoofar.Ineaseaverythickhardenedcrestofdirtthecompressorhastobedismantledforcleaning.
Inthismethodofcleaningthewaterisnotactingasasolventbutinsteadremovesthedepositsmechanicallybytheimpactofthewaterdroplets.Itisthereforerecommendedtousecleanwaterwithoutadditives.Thewatershouldnotcontainanyadditiveswhichmightremainonthecompressorblades.
Periodicallycleaningofthecompressor(Fig.4-2)preventsordelaysexcessivebuild-upofdirtbutinnowayreplacestheusualoverhaulswheretheturbochargeriscompletelydismantled.
Theturbochargerisprovidedwithawatercontainer
(1).Duringthecleaningprocedurethecontainerispressurizedwiththechargeair
(2)andfromwherethewaterisforcedtothecompressorinlet(3).
1.Whichofthefollowingstatementscanbeusedtocleanthecompressorwiththeenginerunning?
A.WaterdropletsWaterwithadditivesC.ChargeairD.Hardcrust
2.Whatprincipalisusedinthismethodofcleaning?
A.Thecleansersolvesthedeposits.
B.Thecleansermeltsthedeposits.
C.Thecleanserbeatsthedepositsmechanically.
D.Thehighpressureofthecleanserremovesthedeposits.
3.Whichofthefollowingstatementsisnotcorrect?
A.Thecompressorneedsregularcleaning.
B.Periodicalcleaningofthecompressorcontributestoreducingbuild-upofdirt.
C.It’snotnecessarytodismantletheturbochargerifperiodicalcleaningofthecompressorisperformed.
D.Additivesshouldbetterbeavoidedduringthecleaningprocess.
4.Thecleaningwatershouldnotcontainanyadditives,because_____.
A.theymaydelaybuild-upofdirt
B.theymightremainonthebladesofthecompressor
C.theymaybeforcedtothecompressorinlet
D.theyarenotgoodsolvents
ACCB
Passage3
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
Passage4
Thevibrationdamperservestoreducethetorsionalvibrationgeneratedbythecrankshaft.Thedamperconsistsofahousingandafreerotatinginertiaringsupportedbyanaxialbearing.Itformsatotallyenclosedunit.Thefreespacebetweeninertiaringanddamperhousingisfilledwithahighviscousfluid.Whenthecrankshaftrotatesatconstantspeed,theinertiaringwillfollowthismovement.Thecombustionpressureexertedoneachpistongeneratesvibrationinthecrankshaft,andeachvariationgeneratedbysuchavibrationwillaffectthemovementoftheinertiaring.Theresultingshiftoftheringtothedamperhousingisopposedbytheviscousfluidandthevibrationwillbereduced.
Theenergy,absorbedduringtheprocess,isconvertedintoheatandthenradiatedtothesurroundingair.Hence,properventilationofthedamperisessential.
Theviscousdamperfluidisduringengineoperationsubjectedtoageingandthefluidbecomesmoreviscous.Insendingfluidsamplesonaregularbasetothedampermanufacturertherateinreductionoftheviscositycanbedetermined.Assamplingintervaltimeis6000hoursadvised.Damperswithatoohighfluidviscositymaycausecrankshaftbreakdown.
Thedampercoverhastwofillingholeslocated180ooppositeeachotherandclosedbyscrew-infillerplugs.Ifoneoftheseplugsisaccessible,afluidsamplecontainercanbescrewedinandasampletakenwiththedamperinplace.Onasparedamper,samplingmustbeeffectedwiththedamperintheverticalposition.
Forliquidsampling,aspecialkitcanbeorderedfromStork-WartsilaDiesel.
1.Thegeneraldescriptionofthevibrationdampertellsusthat_____.
A.thefreespacebetweeninertiaringanddamperhousingisfilledwithalowviscousfluid
B.whentheinertiaringmovesatconstantspeed,thecrankshaftfollowsthismovement
C.thedamperismadeupofahousingandafreerotatinginertiaring
D.noventilationofthedamperisnecessaryasthevibrationreductionprocessabsorbslittleenergy
2.Whichofthefollowingstatementsisnottrueaboutmaintenanceoftheviscousdamper?
A.Samplingintervaltimefordeterminingthequalityofthefluidis6000hours.
B.Forliquidsampling,aspecialkitcanbeused.
C.Onasparedamper,samplingmustbeeffectedwiththedamperinplace.
D.Theviscousfluidinadamperbecomesmoreviscousastimegoesby.
3.Duringtheengineoperation,thevibrationdampercan_____.
A.transfertheenergyoftheengine
B.absorbthecombustionheat
C.opposethecrankshaftrotating
D.reducethevibrationofthecrankshaft
4.Accordingtothepassage,welearnthattwofillingholesinthedampercoverareused_____.
A.torechargethefluid
B.toventilatethedamper
C.tofitthecontainer
D.totakethesample
CCDD
Passage5
Thevibrationdamperemploysahighviscousfluidtoopposetheshiftoftheinertiaringtothe
damperhousing.Itisnecessarytogetsamplestodeterminetherateinreductionoftheviscosity.Thestepstodrawoffthesampleareasfollows(RefertotheFig.4-3):
1.Turntheengineuntilthedrainplugsareeasyaccessible.Donotunscrewthedrainpluguntilthedamperislukewarm(approx.40oC).
2.Carefullytapthelockingoftheupperdrain
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