甲类轮机英语考试新题.docx
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甲类轮机英语考试新题.docx
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甲类轮机英语考试新题
补充单项选择题
1.Thedatatoberecordedonthissheet_____theperformanceoftheengine.
A.makestheexpertstojudgeB.enablestheexpertstojudge
C.maketheexpertsjudgingD.enabletheexpertstojudge
2.Cooling_____theenginemetalsretaintheirmechanicalproperties.
A.forcesB.enables
C.makesD.isableto
3._____thateverythingintheenginecrankcaseiscorrect,startupthecrankcaselubricatingoilpump.
A.TosatisfyB.Tobesatisfied
C.AftersatisfyingD.Afterbeingsatisfied
4.Hearingastrongnoise,_____atonce.
A.theenginestoppedB.theenginewasstopped
C.hestoppedtheengineD.hehadstoppedtheengine
5.Thetwo-strokecyclebeginswiththepistoncomingupfromtheBDC,withthescavengingportsinthesidesofthecylindersbeing_____.
A.openB.uncover
C.coveredD.closed
6.Theterm“moderatespeed”waspreviouslyinterruptedasmeaningaspeedwhichwouldenableavessel______withinhalftherangeofvisibility.
A.stoppingB.beingstopped
C.tostopD.tobestopped
7.Hardlyhadtheenginestarted______thetemperatureofthecoolingwatersuddenlyroseupto40℃.
A.thenB.thanC.whenD.after
8.______duringthelastrepair?
A.DidyouhaveNo.4cylinderrepair
B.DoyouhaveNo.4cylinderrepaired
C.Didn’tyouhaveNo.4cylinderrepairing
D.Didn’tyouhaveNo.4cylinderrepaired
9.Themainengineiscooledwithfreshwater______isaddedsuitablesmallquantitiesofchemicalstopreventcorrosion.
A.inwhichB.onwhich
C.towhichD.bywhich
10.Theexhaustportsarelocatedaroundthelowerpartofthecylinderliner,______theproductsofcombustionaredrivenbyscavengingair.
A.inwhichB.bywhich
C.throughwhichD.fromwhich
11.Whenenteringafoaminjectedspace_____breathingapparatus.
A.putoutB.putonC.takeoffD.takein
12.Theexhaustvalveisopenedataboutthesametime_____theairinletportsareopened.
A.beforeB.afterC.whenD.until
13.______,wecontinuedliftingoutthepistons.
A.LateasitwasB.Asitwaslate
C.SinceitwaslateD.Becauseofitslate
14.______doesittaketochangethemainenginefromaheadtoastern?
A.HowmanytimesB.Howmuchwater
C.HowlongD.Howlength
15.Wehaveplannedtoremovethepistonwiththehelpofassistantengineersduringthecargounloading,whilethevessel______portShanghai.
A.reachestoB.getsC.callsonD.callsat
16.______,thefollowingpossiblecausesshouldbeinvestigated.
A.Shouldtheenginestopwithoutapparentreason
B.Theengineshouldstopwithoutapparentreason
C.Theenginestopswithoutapparentreason
D.Theengineisstoppedwithoutapparentreason
17.Thedifferencebetweenasuperchargedengineandanun-superchargedengineisthat______.
A.thelaterB.thelatterC.theformerD.thefarmer
18._____canbefoundonmostmediumtolargemerchantvesselsevenifthemainengineiseitherasteamturbineor2-strokecrossheadengine.
A.Themediumspeed4-stroketrunkpistonengine
B.Thelowspeed2-strokecrossheadengine
C.Themediumspeed2-strokecrossheadengine
D.Thelowspeed4-stroketrunkpistonengine
19._____allowstheenginetobeplacedwhereverismostsuitable,astheynolongerhavetobealignedwithreductiongearingandshaftingasisthecasewithconventionalinstallations.
A.DieselenginepropulsionB.Dieselelectricpropulsion
C.SteamenginepropulsionD.Gasturbinepropulsion
20.Mediumspeedengineshavea_____powertoweightratiothantheslowspeedtwostrokes,butduetothehigherspeedstendtohave_____maintenanceintervals.
A.higher/reducedB.higher/increased
C.lower/reducedD.lower/increased
21.Thepurposeoftheskirtortrunkinfour-strokecycleenginesistoactinasimilarmannertoa_____.
A.crossheadB.crownC.pistonrodD.connectingrod
22.Thefour-strokecycleissocalledbecauseittakes_____tocompletetheprocessesneededtoconverttheenergyinthefuelintowork.
A.twostrokesofthepistonB.fourstrokesofthepiston
C.onerevolutionofthecrankshaftD.fourrevolutionsofthecrankshaft
23.Inthesuctionstroke,thecrankshaftisrotatingclockwiseandthepistonismoving_____thecylinder.Theinletvalveis_____andafreshchargeofairisbeingdrawnorpushedintothecylinderbytheturbocharger.
A.up/openedB.down/openC.up/closedD.down/closed
24.Itisduring_____thatworkenergyisbeingputintotheengine;duringtheother3strokesofthepiston,theengineishavingtodothework.
A.thesuctionstrokeB.thecompressionstroke
C.theexpansionstrokeD.theexhauststroke
25.Pressurizedairentersthecylinderviatheinletportsandpushestheremainingexhaustgasfromthecylinderinaprocessknownas“_____”.
A.chargingB.superchargingC.scavengingD.exhausting
26.Thebedplatemustberigidenoughtosupporttheweightoftherestoftheengine,andmaintainthecrankshaft,whichsitsinthebearinghousingsinthe______,inalignment.
A.longitudinalgirdersB.transversegirders
C.foregirdersD.aftgirders
27.Basicallythebedplateconsistsoftwo______,whichrunthelengthoftheengine.
A.longitudinalgirdersB.transversegirders
C.foregirdersD.aftgirders
28.TheA-framescarrythecrossheadguidesandsupporttheengine______.
A.foundationB.seatingC.entablatureD.bedplate
29.Topreventexcessive_____inthetransversegirders,thetieboltsarepositionedasclosetothecenterofthecrankshaftaspossible.
A.thermalstressesB.bendingmoments
C.thermalloadsD.surfacetensions
30.Becausethetieboltsaresoclosetothecrankshaft,someenginesemploy______toholdthecrankshaftmainbearingcapinpositioninsteadofconventionalstudsandnuts.
A.throughboltsB.jackboltsC.tapboltsD.fittedbolts
31.Thecrankshaftsonthelargemodern2-strokecrossheadenginesare______big______makesasasingleunitandsoareconstructedbyjoiningtogetherindividualforgings.
A.enough/toB.too/toC.such/soD.so/that
32.Thecrankpinsandjournalsweremachinedandmatchingholesboredinthewebs,whichwereslightly______indiameter.
A.smallerB.largerC.higherD.lower
33.Today,crankshaftsforlarge2-strokecrossheadenginesareofthe______type.
A.semi-builtB.built-upC.solidforgedD.individualforged
34.The______ofthesemi-builtmethodoftheconstructioncrankshaftisthatbymakingthetwowebsandcrankpinfromasingleforgingthegrainflowinthesteelfollowsthewebroundintothecrankpinandbackdowntheotherweb.
A.advantagesB.disadvantages
C.poweradvantagesD.powerdisadvantages
35.Theconnectingrodisfittedbetweenthecrossheadandthecrankshaft.Ittransmitsthefiringforce,andtogetherwiththecrankshaftconvertthe_____motiontoa_____motion.
A.rotary/reciprocatingB.upanddown/foreandaft
C.foreandaft/upanddownD.upanddown/rotary
36.Theslippersrun______inthecrossheadguidesasthepistonandrodare______andpreventthetopoftheconnectingrodfrommovingsideways.
A.upanddown/reciprocatingB.upanddown/rotating
C.backandforth/reciprocatingD.backandforth/rotating
37.Becausethetopoftheconnectingrodswingsaboutthepinandchangesdirectioneachtimethepistonreachesmid-stroke,therelativespeedbetweenbearingandpinatmid-strokeiszero,______toamaximumasthepistonapproachestoporbottomdeadcenterandthen______backtozeroagainasthepistonapproachesmid-strokeandtheconnectingrodchangesdirection.
A.accelerates/deceleratesB.accelerates/accelerates
C.decelerates/deceleratesD.decelerates/accelerates
38.Theloadonthecrossheadpinisalways______,soitisthe______halfofthebearingwhichissubjecttowear.
A.upwards/topB.upwards/bottom
C.downwards/topD.downwards/bottom
39.Becauseofthehighloadsthebearingmaterialisatin-aluminumalloybondedtoasteelshell.Thecrossheadpinishighlypolishedtoa______.
A.flatsurfaceB.mirrorfinishC.slopingsurfaceD.inclinedsurface
40.Oilissuppliedtothecrossheadusingaswingingarmora_____andissometimesboostedinpressuretoandefficientlubrication.
A.telescopicpipeB.largeborepipeC.generatingpipeD.centralpipe
41.Becauseoftheresultinghigherpressuresinthecylinderfromthecombustionofthisgreatermassoffuel,andthelargerdiameters,thelinermustbemade_____atthetoptoaccommodatethehigherstresses,andpreventcrackingofthematerial.
A.thinnerB.thickerC.smootherD.rougher
42.Cylinderlinersfromolderlowerpoweredengineshadauniformwallthicknessandthecoolingwasachievedbycirculatingcoolingwaterthroughaspaceformedbetween_____.
A.crownandskirtB.linerandjacket
C.ringandgrooveD.jacketandblock
43.Fuelhastobeinjectedintotheengineatahighpressuresothatit_____correctly.
A.ispurifiedB.intimedC.iscompressedD.atomizes
44.Becausethetimingofinjectioniscrucial,_____mountedonthecamshaft,whichisdrivenbythecrankshaftareusedtooperatethefuelpumps,oneofwhichisprovidedforeachcylinder.
A.gearsB.ramsC.barrelsD.cams
45.Thehigh-pressurefuelopensthefuelvalveandissprayedintothecylinderintinydropletsknownas_____.
A.injectionB.penetrationC.atomizationD.compression
46.Itisimportanttonotethattheinjectiononlytakesplacewhentheplungerismovingupthecam_____.
A.basecircleB.slopeC.bottompointD.toppoint
47.Astheplungermovesupwardsinthebarrel,injectionwillcommenceoncetheplungerhas_____thespillportsandthe
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