上海试题.docx
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上海试题.docx
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上海试题
1.Thereciprocatingmotionofthepistonisconvertedto____motionofthecrankshaftbytheconnectingrod,whichswivelsaboutthewrist(pistonorgudgeon)pinatthetop,andatitsbottomendrotatesaboutthecrankpin.
a.turningb.relativec.rollingd.backandforth
2.Whilethesearetheoreticalcyclesthatareonly____inreality,itisthedualcombustioncyclethatmostaccuratelyrepresentstheoperationofmostdieselenginesofcurrentdesign.
a.approximatedb.closedc.approachd.accurate
3,IntheOttocycle,achargeoffuelandairisignitedbyasparkandburnsexplosively,sorapidlythatcombustioniscompletedbeforethepistonbeginstomovedownandtherefore____atconstantvolume.
a.taketheplaceofb.occursc,istakenplaced.carryout
4.Practicalconsiderationspreventalltheseotherfactorsfrom___,butthefactorremainsthatthecloserthedualcombustioncyclecanbemadetoapproachanOttocycle,withalargefractionofthefuelburningrapidlybeforethepistoncommenceitsdownwardstroke,thehigherwillbeitstheoreticalthermalefficiency.
a.beingthesameb.equalc.isequald,equation
5.Ottoanddualcombustioncyclesarerelatedbythemannerinwhichcombustiontakesplace,ifallotherfactorswereequal,thetheoreticalthermalefficiency__higherforanOttocycle.
a.wouldbeb.willbec.wasd.is
6.Insteamturbineshighpressuresteamisdirectedinto__bladesorvanesattachedtoashaft,causingittorotate.
a.aseriesofb.aseriousofc,seriesofd.serious
7.Gasturbinesdifferfromsteamturbines__gasratherthansteamisusedtoturnashaft.
a.since(inthat)b.sothatc.therefored.thus
8.Asthecylindervolumeincreases,howeverthecontinuedcombustionmaintainsthepressureinthecylinderuntilinjectionandthencombustion__.
a.stopb.increasec.ceased.tocease
9.Theexhauststrokeactuallybeginsjustbeforethepistonreachesbottomdeadcenter,whentheexhaustvalveopensandtheresidualhighpressureinthecylinder__theexhaustmanifoldasthegasesblowdown.
a.isrelievedintob.isreducedintoc.isdischargingtod.ischargedinto
10.Fuelinjectionbeginsduringthe__stroke,beforethepistonreachestopdeadcenter.
a.expansionb.suctionc.compressiond.exhaust
11.Withoutexception,modernoil-burningdieselenginesachievethese__withsolidinjectionsystems.
a.objectivesb.gatec.doord.object
12.Itisimportantto__thatinahighspeedenginethecrankshaftrotatesfartherinagivenperiodoftimethaninalowspeedengine,whichexplainsthegenerallylowertoleranceofhighspeedenginesforfueloflowignitionquality.
a.indicateb.writec.explaind.show
13.Ifthepressurerisestoosharplythecombustionbecomesaudible,aphenomenonknownas__.
a.dieselknockb.dieselenginec.mechanicald.fireknock
14.Oncethecombustionhasbeenestablishedinthecylinder,furtherfueldropletsenteringthecylinderwillburnassoonastheyhavepenetrated,heated,vaporized,andmixed,sothatthecombustionrate__theinjectionratebythepreparationtime.
a.lagsbehindb.leadingc.isslowerthand.isthesameas
15.Typically,however,__someirregularitiesreflectingcombustionofincompletelyburnedfuelorofintermediatecombustionproducts,andsomedelayedchemicalendreactions.
a.therewillbeb.thereisc.therewillhaved.therehas
16.Compressordischargepressureisusuallydescribedbyitsratioto__,calledthepressureratio.
a.intakepressureb.dischargepressurec.waterpressured.exhaustpressure
17.Currently,turbo-chargersaresuitableforpressureratios__4.0.
a.ashighasb.suchhighasc.aslowasd.aswellas
18.Maintainingtheengineinawarmconditionhelpsinminimizing__.
a.frictionb.wearc.corrosiond.rust
19.Auxiliaryengine__self-containedcoolingcircuits.
a.tendstob.tendtoc.tendstohaved.tendtohave
20.Cylinderoilisahighviscositymineraloil,witha__matchedtotheanticipatedsulfurcontentofthefuel.
a.TANb.TBNc.SANd.SBN
21.Incrossheadenginesingoodconditionthecylinderoilconsumptionmayusuallybe__.
a.below0.1g/hp.Hrb.above10g/hp.hr
c.below1.0g/hpd.zero
22.Thechangefromonefueltoanother__graduallytoallowtemperatureinthesystemtostabilize.
a.takeplaceb.aretakenplacec.shouldtakeplaced.shouldbetakenplace
23.Refiningseparatescrudeoilintonumberofhydrocarbonproductsinaprocessbasedontheir__,withthelightestproductshavingthelowestboilingpoints(evaporationpoints).
a.boilingpointsb.flashpointsc.freezingpointsd.meltingpoints.
24.Farmorefrequentlyitisblendedwithadistilledproduct(thecuttingstock)toproducealessviscousintermediatefuel,which,dependingontheproportionsused,canitself__lightorheavy.
a.bedefinedasb.bereferredtoasc.calledd.name
25.Itcanbeseenthatrelativelysmallfractionofdistilledproductcanreducetheviscositysubstantially,sothateventhelighterblendswillcontain__ofundesirableconstituents.
a.largeamountsb.importantamountsc.smallamountsd.afew
26.Thepresenceofsulfurinthefuelthereforeindicatesapotentialfor__,i.e.,acidicattackofsurfacesexposedtotheexhaustgaswhentheyareatorbelowabout150。
C.
a.coldendcorrosionb.hotendcorrosionc.corrosionattheend
d.corrosionintheend
27.Torsionalvibrationarises(results)fromperiodically__superimposeduponthesteadytorquebeingtransmittedtotheload.
a.changingtorqueb.strongtorquec.verygreattorqued.steadytorque
28.WhenapropulsionsystemisoperatedinitnormalrangeofRPM,torsionalvibrationbecomesaproblemifasourceofexcitationhasafirstorhigherorderfrequency__oneofthenaturalfrequenciesfortorsionalvibrationoftherotatingsystem.
a.nearb.closedtoc.shutoffd.close
29.Underthesecircumstances,thetorquevariationofthesourcewillforcetherotatingsystemintoresonance,causingittooscillatetorsionallyathighangularamplitude,withcorrespondinghighstressesthatcould__shaftlinecomponentfatiguefailure.
a.resultfromb.leadtoc.withtheresultthatd.resultin
30.Ingearedinstallationsatlowpowerlevels,theoscillationscancausethegeartoothloadedfacesto__separateandchatter.
a.irregularlyb.periodicalc.periodd.regularly
31.____,themetalexpands.
a.heatingb.heatedc.heatsd.toheat
32.Intheevaporator,theliquidvaporizesataconstantpressureandtemperatureasheatis__throughthewallsofthecoolingcoils.
a.givenupb.packedupc.putupd.pickedup
33.Apumprequiredinthehydraulicsystemwhichcanimmediatelypumpfluidinordertoprovideahydraulicforcethatwillmovetherudderisof__type.
a.variabledeliveryb.constantdeliveryc.smalldeliveryd.largedelivery
34.Aroundthefurnacearebanksoftubes,whichhaveconnectedwithtwodrums___.
a.respectfulb.respectfullyc.respectivelyd.respective
35.Allworkingpartsoftheequipmentwhich__wearortodamageshouldbeeasilyaccessibleformaintenance.
a.arereliableb.areliabletoc.arelikelytod.arepossible
36.Inearlyapplicationsthecontrolstation__theopentypeplacedintheengineroom.
a.wasofb.isofc.wered.is
36.Thesestoreddataarethenavailableforlocaldisplayandprintoutaswellas__ashorebysatelliteand/ormodemtocompanyheadquarters.
a.transmissionb.transmittedc.transferredd.transportation
37.The__ofadigitalcentraloperatingsystemanditsusesarelimitedonlybytheimaginationoftheengineerandthedesiresoftheowner.
a.implementationb.carryoutc.conductd.achievement
38.Internalstorage_thememorybankusedastheresidenceforinstruction,computation,andotherfunctionsthatdeterminethe__ofthesystem.
a.featureb.performancec.speedd.capacity
39.Inputregister–unitstoprovideapathintotheinternalstoragefortheinstructionsordatauponwhichthecomputer____asasystem.
a.doesb.functionsc.sailsd.compares
40.Outputregisters–providersofthepathfortheresultsofany__directedbythesystemtobeoutputtotheobserverorthecentralsystem.
a.operationb.maintenancec.componentsd.communications
41.Itisnecessarythatthesemachines___insynchronismwitheachother.
a.beingb.arec.wered.be
42.Itmaybenecessarytohavethewindings__beforeputtingthemotorintooperation.
a.driedb.dryingc.beingdriedd.havingdried
43.Themotorstopsrunning,thepowersupply__introuble.
a.isb.beenc.beingd.be
44.Thereisadangerofthestartingcurrent__thatthewindingsareburntout.
a.toincreaseb.tobesoincreasedc.increasedd.beingsoincreased
45.Thepropelleradvancesadistancethroughthewaterinonerevolutionequaltoitspitchminusaslippage,calledslip,which__theaxialvelocityinducedbythepropeller.
a.isequivalenttob.equivalenttoc.isequaltod.equivalenceof
46.ClassIforthemajorityofmerchantvesselsgivestoleranceonpitchofthebladesof+_0.75percentwithanylocalpitchontheblade__+_2percent.
a.beingb.isc.ared.willbe
47.Theenduranceportionofthetrialdemonstratestheabilityofalltheship,ssystemto__foraprescribedextendedperiodoftimeatmaximumspeedandpowerwithoutthefailureofthecomponents.
a.performb.predictionc.predictd.evaluated
48.Thisinformationisusefultotheship’sofficerin__theshipandmayberequiredasevidenceinalegalactioninvolvingtheship.
a.handlingb.exercisingc.operationd.drive
49.Trainingcour
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