第46期轮机英语试题.docx
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第46期轮机英语试题.docx
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第46期轮机英语试题
第46期轮机英语试题
一、单项选择题
1.Inordertocontrolthermalstresses,sometypeofmodernenginesusepistonwith______.
A.heavywallandintensivecooling
B.heavywallandnocooling
C.thinwallandnocooling
D.thinwallandintensivecooling
2.Theaveragepressureexertedonapistonduringeachpowerstrokeistermed______.
A.indicatedhorsepowerB.meaneffectivepressure
C.exhaustbackpressureD.compressionpressure
3.Theignitionqualityofadieselfuelisindicatedbythe______.
A.cetanenumberB.volatilitypoint
C.viscosityindexD.octanenumber
4.Apistoninafour-stroke/cycledieselenginemakesfourstrokesduringeach______.
A.crankshaftrevolutionB.mechanicalcycleofoperation
C.periodoftwocombustioncyclesD.cycleoftwoevents
5.Crankshaftsofmediumspeedenginesare______fromasinglepieceofsteel.
A.unusuallysolidweldedB.neverbesolidforged
C.almostinvariablysolidforgedD.almostinvariablybewelded
6.Thestartingairenteringthecylinderbeginswhenthepiston______.
A.hasnearlycometotheTDCB.hasjustpasttheTDC
C.hasnearlycometotheBDCD.hasjustpasttheBDC
7.Amainbearingconsistsoftwoshellswhicharesecuredbymeansofstudsand______.
A.tierodsB.throughboltsC.leadwiresD.bearingcaps
8.Comparedtofour-stroke/cycleengines,two-stroke/cycledieselengineshavethedisadvantageof______.
A.lesseventorqueB.highercylinderheadtemperatures
C.fewerpowerstrokesperrevolutionD.greaterweight/sizerequirements
9.______controlsthefueloiltemperatureinordertoprovideoilatthecorrectviscosityforcombustion.
A.TheviscosityregulatorB.Thetemperaturecontroller
C.TheflowmeterD.greaterweight/sizerequirements
10.Inadieselenginelubeoilsystem,whichofthefollowingpartsshouldbelubricatedfirst?
A.CamshaftbearingsB.MainbearingsC.PistoncrownsD.Cylinderwalls
11.Alarge,low-speed,mainpropulsiondieselengineusesseawatertodirectlycoolthe______.
A.cylinderheadsB.exhaustvalvesC.scavengingairD.injectors
12.Inaturbocharger,inletairvelocityisincreasedinthe______.
A.inletnozzleringB.stationarydiffuserpassages
C.compressoroutletvoluteD.rotatingimpellervanes
13.Eachcylinderhasonestartingvalvewhichisusuallyopenedbyairpressureandclosedby______.
A.nutsandboltsB.newjointsC.springforceD.sealingrings
14.Inasimplemechanicalgovernor,the______.
A.centrifugalforcerotatestheball-head
B.flyweightcentrifugalforceisbalancedbyspringforce
C.flyweightcentrifugalforceisbalancedbyhydraulicpressure
D.speederspringaloneactuatesthefuelcontrolrod
15.Apyrometerisaninstrumentcommonlyusedtomeasure______.
A.cylinderpressureB.flameintensity
C.exhaustgastemperatureD.crankshaftaxialalignment
16.Afterstartingadieselengine,whichofthelistedoperatingconditionsshouldbecheckedfirst?
A.AirboxpressureB.LubeoilpressureC.ExhausttemperaturesD.Rawwaterpressure
17.Ahightemperaturealarmor______whichwillmeltisusedtoguardagainsttheexplosionofcompressorairpipelines.
A.aflametrapB.areliefvalveC.afusibleplugD.aburstingcap
18.Whatpreventativemaintenanceshouldbedonefrequentlytodieselenginesstartingairreceivers?
A.Draintheaccumulatedmoisture
B.Testthereliefvalves
C.Watchthetemperaturetopreventfluctuationinpressure
D.Cleantheinteriortoremoveoilandforeignmatter
19.Inreducingenginespeedtoanefficientpropellerspeedbytheuseofreductiongears,______.
A.speedandtorquearebothreduced
B.speedisreducedandtorqueremainsuncharged
C.speedisreducedandtorqueisincreased
D.speedissometimesunchangedwhiletorqueisincreased
20.Whichofthefollowingstatementsconcerningfire-tubeboilersiscorrect?
A.Combustiongasesflowthroughthetubes
B.Flamesimpingeonthetubes
C.Combustionoccursinthetubes
D.Waterflowsthroughthetubes
21.Theexhaustboilersareusedtorecoversomeof______carriedintheexhaustgasfromthemainengine.
A.waterB.oilC.heatD.steam
22.Thewaterlevelinasteamingauxiliaryboilerwillalways______.
A.risewhenthesteampressureisincreased
B.remainconstantaslongasthefeedpumpoperates
C.fallwhenthesteampressureisdecreased
D.varyasthesteamdemandchanges
23.Whenlightingoffanauxiliaryboiler,whichoftheproblemslistedcouldcausetheburnerstosputter?
A.ColdfueloilB.Lowfueloilpressure
C.LowatomizingsteampressureD.Waterinthefueloil
24.Ifthefeedpumpforanauxiliaryboilerfailstodeliverthefeedwatertotheboiler,thecausemaybe______.
A.highsteampressureintheboilerB.abnormallyhighfeed-watertemperature
C.abnormallyhighboilerwatertemperatureD.steamdemandexceedingfeedpumpcapacity
25.Througha______pump,theliquidistransferredfromthesuctiontothedischargebythemechanicalvariationofthevolumeofachamberorchambers.
A.positivedisplacementB.ejector
C.centrifugalD.aircompressor
26.Sealinglinesprovidesealingliquidflowtothestuffingboxofacentrifugalpump______.
A.topreventseawaterfrompassingoutthestuffingboxwhenahighsuctionheadispresent
B.tocooltheshaft
C.inplaceofmechanicalseals
D.inplaceoflanternrings
27.Whichofthevalveslistedwillbecycledfromfullyopentofullyclosewhenthehandleisturned90degree?
A.ArisingsteamgatevalveB.Aglobestopvalve
C.AcheckvalveD.Abutterflyvalve
28.Centrifugalpumps,usedtohandlehotliquids,musthaveaminimumflowthroughthemunderalloperatingconditions.Thisflowservesto______.
A.preventoverheatinganddamagetopumprotatingpartsduetorubbing
B.maintainthenetpositivesuctionheadofthepump
C.maintainhydraulicdifferentialinthepumpimpellerpassages
D.purgethepumpofnon-condensablevaporsandgases
29.Ifyouhearda‘crankling’noiseinacentrifugalpump,themostprobablecauseoftheproblemwouldbe______.
A.insufficientspeedB.cavitation
C.excessdischargepressureD.excessivenetpositivesuctionhead
30.Intheprocessof______,liquidchangesintogas.
A.evaporationB.frostingC.condensingD.compressing
31.Thedeviceusedforlow-pressurecontrolandhigh-pressurecutoutonacompressoriscalleda______.
A.cutoutB.pressurecontroller
C.controllerswitchD.cutoutswitch
32.Apurgerecoverysystemisusedincentralairconditioningorrefrigerationsystemto______.
A.purgelubeoilfromtheliquidrefrigerant
B.recoverwaterpurgedfromthesystem
C.separatefoulgasesfromthereceiver
D.purgenon-condensablegaseswithoutlosingrefrigerant
33.Inanairconditioningsystem,lowheadpressureassociatedwithareciprocatingcompressorcanbetheresultof______.
A.brokenvalvespringsB.tightdrivebelts
C.highlinevoltageD.airinthesystem
34.Whendischargingbilgewateroverboard,whichcriteriamustbeobserved?
A.Therequirementfortheoilcontentofbilgewaterdischargedisunder15ppm
B.Nodischargeinsensitivewaters
C.Anydischargeinsensitivewaters
D.International,nationalorlocalrequirementshavetobeobserved
35.Thefollowingmeasurescanbeusedtoimproveoilywaterseparator’sseparatingeffectexcept______.
A.overhaulingeverytwoyearB.workingatintervals
C.renewingfiltrationmaterialD.properlyheating
36.Disposalofallkindsofgarbagebut______listedasbelowisprohibitedwhiningSpecialAreas.
A.comminutedorgroundpapers,rags,glass,metaletcB.plastics
C.foodwastecomminutedorgroundD.Incineratorash
37.Whendoesauxiliaryburnerofincineratorputintooperation?
Ⅰ、startincineratorwhenitiscoldⅡ、littlewasteoilfordealingwithⅢ、plentyofwasteoilfordealingwithⅣ、thewaterandimpurityinsludgearetoomuchⅤ、thetemperatureinincineratorislowⅥ、dealingwithlittlesolidrubbish
A.Ⅱ+Ⅲ+ⅤB.Ⅰ+Ⅱ+Ⅲ+ⅣC.Ⅰ+Ⅳ+Ⅴ+ⅥD.Ⅰ+Ⅱ+Ⅲ+Ⅵ
38.Bacteriawhichlive______aresaidtobeaerobic.
A.inthepresenceofoxygenB.withoutoxygen
C.inthepresenceofnutritionD.withoutnutrition
39.Whencentrifugingheavyfueloil,animportantfactortoconsideris(are)the______.①flowrate②viscosityofthefueloil
A.①B.②C.①②D.Neither①nor②arecorrect
40.Toensurelubeoilpurifierworkinginnormalcondition,theintervalbetweentwosludgedischargingshouldnotexceed______hours.
A.2B.4C.5D.6
41.______cannotcauseoilflowfromwateroutletofselfcleaningpurifier.
A.OiltemperaturetoohighB.Diameterofgravitydisctoolarge
C.OiltemperaturetoolowD.Highleveltankoutofwater
42.Intheproductionoffreshwaterfromseawaterthroughaprocessofheatingandcooling,thecoolingphaseofproductionisusuallycalled______.
A.evaporationB.distillationC.dehydrationD.condensation
43.Distilledwaterfromanevaporatormaybedischargedintoapotablewatertank______.
A.throughadetachablehoseconnection
B.afterpassingthroughanactivatedcharcoalfilter
C.afterchemicalanalysisshowsitisfitforconsumption
D.throughasolenoidoperatedthree-wayvalve
44.Whattypeofvalveisusedtodirecttheflowofhydraulicfluid?
A.reliefvalveB.directioncontrolvalve
C.stopvalveD.pressurecontrolvalve
45.Cargohandlingunitisratedaccordingtothe______tobelifted.
A.cargocraneB.jib
C.safeworkingloadD.oilpressure
46.Thecraneisusuallymountedonapedestaltoofferadequate______totheoperator.
A.timeB.spaceC.lengthD.visibility
47.Properinternallubricationofahydraulicanchorwindlassleftidleforextendedperiodscanbeaccomplishedby______.
A.pe
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- 46 轮机 英语试题