轮机大管轮英语真题45期

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1、中华人民共和国海事局2008年第1期海船船员适任证书全国统考试题(总第45期)科目：轮机英语试卷代号：803适用对象：无限、近洋航区3000KW及以上船舶大管轮（本试卷卷面总分100分，及格分为70分，考试时间为100分钟）答题说明：请选择一个最合适的答案，并将该答案按答题卡要求，在其相应位置上用2B铅笔涂黑。第1题至82题，每题1分，第83题至94题，每题1.5分。一、单项选择题：1._____theengines,thedieselengineis____usedengineonboard.A.Between

2、/morecommonlyB.Among/themostcommonlyC.Between/notmorecommonlyD.Among/notthemostcommonly2.Pistoncoolingfinsarelocated.A.atopthepistoncrownB.beneaththepistoncrownC.atthebaseofthepistonskirtD.insidethecylinderlinercoolingwaterjacket3.Whichofthefollowingcondition

3、sisrealizedbytheturbo-chargingofapreviouslynaturallyaspirateddieselengine?A.Ignitionlagincreases.B.Lubeoilsystempressureincreases.C.Brakespecificfuelconsumptionincreases.D.Mechanicalefficiencyincreases.4.Whichofthefollowingrepresentsthesignificancethefueloilc

4、etanenumber?A.Thecetanenumberhasnoaffectoninjectionlag.B.Thecetanenumberisanindicationofthefuel'sviscosity.C.Ignitionlagisreducedwithfuelshavingahighcetanenumber.D.Thecetanenumberisoflittlesignificanceinthecombustionprocess.5.Indirectcoolingoffuelinjectornozz

5、leholdersfordieselenginesisaccomplishedprimarilybyA.heatconductionintotheinjectedfueloilB.heatconductionintothewaterjacketwallC.watercirculationthroughpassagesintheholderD.fueloilcirculationthroughpassagesmtheholder6.Theupperpistonringsmlarge,slow-speed,two-s

6、troke/cycledieselenginesaremosteffectivelylubricatedbyoil____.A.fedfrommechanicallubricatorsB.thrownofffromthemainbearingsC.suppliedfromwickfeddriplubricatorsD.flowfromacentrifugalorbanjooiler7.Inadieselengineclosedfreshwatercoolingsystem,theamountofcoolantfl

7、owingthroughtheheatexchangeriscontrolledbythe__.A.suctionpressureregulatorB.thermostaticbypassvalveC.seawatertemperatureD.waterlevelintheexpansiontank8.Exhaustgasesaregenerallyremovedfromthecylindersofatwo-stroke/cycledieselengineby.A.naturalaspirationB.maske

8、dintakevalvesC.airceilsD.scavengingair9.Vesselshavingmainenginesarrangedforairstartingaretobeprovidedwithatleast__.A.oneautomaticdrainservingbothcontainersB.twoairstartingcontainersofappr