大管轮英语补充题.docx

大管轮英语补充题.docx

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大管轮英语补充题

◆Thedistancebetweenthebottomofthehullandthewaterlineiscalled____.

A.tonnageB.reservebuoyancyC.draftD.freeboard◆Foranuprightvessel,draftistheverticaldistancebetweenthekeelandthe____.

A.waterlineB.freeboarddeckC.PlimsollmarkD.amidshipssection◆hetrimofavesselisthe____.

A.valueofthemeandraftB.degreeoflistC.amountofrollD.differenceinforeandaftdrafts◆Thedifferencebetweenthestarboardandportdraftscausedbyatransverseshiftinweightis____.

A.listB.heelC.trim首尾吃水差D.flotation◆Whenashipinloadedconditionfloatsatarbitrarywaterline,itsdisplacementistotherelevantmassofwaterdisplace

A.equalB.largerC.smallerD.equivalent◆Thedisplacementofashipistothetotalweight,alltold,oftherelevantloadedship.

A.largerB.equalC.smallerD.equivalent◆Ifthebuoyantforceonaship’shullisequaltoorgreaterthanthedisplacementtonnage,theshipwill____.

A.requireballastaddedtoonlytheportsidetanksB.bedownbytheheadC.sinkD.float◆Youmayimproveavessel’sstabilityby____.

A.keepingthefueltankstoppedoffB.increasingthefreesurfaceeffectC.keepingthefueltanksatleasthaftfullD.keepingatleastonefueltankemptyforslops◆Thestabilityofavesselisnormallythegreatestwhenallfuelandwatertanksarefullbecausethe____.

A.centerofgravityisloweredB.centerofbuoyancyisloweredC.reservebuoyancyisunchangedD.hullfreeboardisincreased◆Thedepthoftheshipbelowwaterlinemeasuredverticallytothelowestpartofthehulliscalled.

A.trimB.leanC.draftD.tonnage◆Somemediumandhighspeeddieselenginesrequirereductiongearunitstoprovideausefulpropellerspeed.Inmostreductiongears,thebullgear.

A.mustchurntheoilinthesumpB.isconnectedtothepropellershaftC.isdrivenatthehighestrpmD.compensatesforalignmentvariationsbetweentheengineandpiniongear◆Whenusedwithreversingreductiongears,medium-speeddieselenginesshouldbeboltedtotheirfoundationswithfittedboltsatthedriveendandclearanceboltsinotherlocations.Thisisdoneto.

A.maintainalignmentwhentheship’shullisworkinginheavyseasB.ensureenginevibrationscorrespondtothenaturalfrequencyofthehullC.permittheenginetoexpandawayfromthedrivenequipmentastheengineheatsupandexpandsD.maintainenginethrustbearingclearances◆Whatdeterminesthenumberofeventsoccurringinacycleofoperationinaninternalcombustionengine?

A.Crankshaftrevolution.B.Typeofengine.C.Distanceapistontravelsduringastroke.D.Numberofpistons.◆Gasturbinesdifferfromsteamenginesinthat_____.

A.steamratherthangasisusedtoturnashaftB.vaporratherthangasisusedtoturnashaftC.theformerusesgastoturnashaftD.thelatterusesgastoturnashaft◆Themainoperatingcharacteristicofdieselengineswhichdistinguishesthemfromotherinternalcombustionenginesisthe.

A.methodofsupplyingairB.coolingsystemC.methodofignitingfuelD.valveoperatingmechanism◆Whichofthefollowingreasonsrepresentswhythedesignedcompressionratioofagasolineengineislowerthanthatofadieselengine?

A.CompressionmustbelowforeffectivesparkignitionB.CompressionmustbelowforrequiredhorsepowerandtorquegenerationC.Compressionmustbelowtopreventpre-ignitionD.Compressionmustbelowtohaveeffectivepre-ignition◆Large,slowspeed,two-strokemarinedieselenginesoffertheadvantagesofthefollowingexcept_________.

A.burningpoorerquality,cheaperfuelB.providinglargepowerC.beingreversibleD.usinglessoilthanmediumspeedengines◆Whyareslowspeeddieselenginesespeciallytall?

A.Becauseinthiswaythepistoncanbewithdrawndownwards.B.Theenginecanoccupylargerspace.C.Theenginemayhavelongstrokeswhichimproveengineefficiency.D.Moremaintenanceisprovided.◆Large,slowspeed,two-strokemarinedieselenginesaredirectlycoupledtothepropelleranddonotrequirea____________.

A.pistonB.gearboxesC.crankshaftD.thrustblock◆Sincemostmedium-speeddieselenginesarenon-reversible,whatisusuallyusedtocaterforasternthrust?

A.areversinggearB.acontrollablepitchpropellerC.afixedpitchpropellerD.aclutch◆Mediumspeedengineshavethefollowingadvantagesexcept___________.

A.MediumspeedenginesuselessoilthanslowspeedenginesB.Mediumspeedenginesoflatertypearecapableofburninglowqualityheavyfueloil.C.TheengineshavelongstrokeswhichimproveengineefficiencyD.Theenginesarecompact,thusprovidingmorespacesforcargoesandpassengers.◆Powerisdefinedasthe____.

A.rateofdoingworkB.amountofforceneededtoovercomefrictionC.amountofworkaccomplishedD.distancethroughwhichanobjectismoved◆Mechanicalenergyintransitionisreferredtoas____.

A.horsepowerB.workC.heatD.velocity◆Whichofthefollowingtermscouldbeappliedtothesimpledefinition“theenergyofmotion”?

.

A.ElectricalenergyB.Thermalenergy.C.Potentialenergy.D.Kineticenergy.◆Themostimportantfactorinengineperformanceistheactualpoweroutputattheendofthecrankshaftavailablefordoingwork.Thisisknownas_____.

A.indicatedhorsepowerB.brakehorsepowerC.nethorsepowerD.frictionhorsepower◆Theisthepoweravailableattheoutputshaftoftheengineandcanbemeasuredusingatorsionmeterorwithabrake.

A.electricpowerB.shaftpowerC.indicatedpowerD.mechanicalpower◆Maximumhorsepowerofadieselengineisattained.

A.whentheenginerpmispulleddownbyoverloadB.atratedenginerpmC.at95%ofratedenginerpmD.at95%ofaproperlyadjustedgovernorrpmwiththeengineunderfullload◆Afourcylinder,four-stroke/cycle,singleactingdieselenginehasa740mmboreanda1500mmstroke.Whatindicatedpowerwillbedevelopediftheaveragemeaneffectivepressureis18kg/cm2ataspeedof90RPM?

A.3416kWB.4644kWC.7296kWD.9290kW◆Asevencylinder,two-stroke/cycle,singleactingdieselenginewithacylinderindicatedhorsepowercalculatedas1350kWandbrakehorsepowermeasuredat7466kWhasamechanicalefficiencyof_____.

A.18%B.55%C.79%D.83%◆Aneightcylinder,four-stroke/cycle,singleactingdieselenginehasa650mmboreanda1400mmstroke,effectivepressureis30kg/cm2ataspeedof100rpm,itscapacityshouldbe.?

A.1689kmB.9111kwC.12388kwD.24776kw◆Supposetheratedcapacityofthemainengineofashipis10,000KWat100ratedrpm,thenwhenat80rpmitscapacityshouldbe.

A.800KWB.5120KWC.6400KWD.4180KW◆Ifyourvesselburns8tonsoffuelperhourat15knots，howmanytonsperhourwillitburnat18knots?

A.13.82tons.B.15.61tons.C.16.00tons.D.16.37tons.◆Thecubicinchdisplacementofacylinderisdeterminedbythediameterofthepistonandthe.

A.lengthofthecrankshaftB.volumeoftheclearancespaceC.weightofpistonD.lengthofthestroke◆Theboreofadieselenginecylinderdescribesthe____.

A.sweptvolumeofthecylinderB.insidediameterofthecylinderC.pistondisplacementinthecylinderD.lengthofthepistonstroke◆Accordingtotheprincipleoffour-strokedieselengine,whatisthenumberofitsefficientworkstrokeperrevolution?

A.1/2B.1C.2D.3◆Accordingtotheprincipleoftwo-strokedieselengine,whatisthenumberofitsefficientworkstrokeperrevolution?

A.1/2B.1C.2D.3◆Theratioofthebrakehorsepowertotheindicatedhorsepowerofadieselengineisits____.

A.thermalefficiencyB.mechanicalefficiencyC.brakethermalefficiencyD.volumetricefficiency◆“AMIDSHIPS”refersto____.

A.backofthevesselB.themiddleportionofashipC.abackwardmovementofavesselD.acrosstheship,atrightanglestothefore-and-aftcenterline◆____poweristhepowerdevelopedwithinthecylinderandcanbemeasuredbyanengineindicator.

A.TheshaftB.ThemechanicalC.TheelectricD.Theindicated◆UsethefollowingequationtocalculatethecylinderoilfeedrateatspecifiedMCR:

Q=BS×Pe×24×10-3,Q=FeedrateatspecifiedMCRBS=BasicSetting,seeItem4.3Pe=EffectiveenginepoweratspecifiedMCREngineTypePeatSpecifiedMCRBasicSettingatSpecifiedMCR6L60MC156001.06S80MC297001.2ThecylinderoilfeedrateatspecifiedMCRof6L60MCis____.

A.855.4B.374.4C.449.3D.712.8◆Incrossheadenginesingoodconditionthecylinderoilconsumptionmayusuallybe.

A.below0.lg/hp.hr.B.above10g/hp.hr.C.belowl.0g/hp.hr.D.zero◆Inadieselengine,thetimetakentoheatthefuelparticles,turnthemintovapor,andbringaboutcombustioniscalled______

A.injectionlagB.ignitiondelayC.compressionignitionD.turbulencelag◆Foraparticularenginepowerthetwo-strokeenginewillbeconsiderablylighter._______________thecomplicatedvalveoperatin

A.Northetwo-strokeenginerequiresB.Nordoesthetwo-strokeenginerequireC.Northetwo-strokeenginerequireD.Nordothetwo-strokeenginerequire◆Modernmarinedieselenginesusingmechanicalfuelinjection,operateonacombustioncyclewhichis______.

A.acombinationofconstantvolumeandconstantpressureB.acombinationofconstanttemperatureandconstantpressureC.entirelyconstantpressureD.entirelyconstantvolume◆MostpracticaldieselenginestodayoperateoncyclewhichisacombinationoftheDieselandOttocycles.Inthisprocess,compressionignition______

A.beginsonaconstantvolumebasisB.beginsonaconstantpressurebasi