轮机英语历年真题46期

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1、中华人民共和国海事局2008第2期海船船员适任统考试题(总第46期)科目：轮机英语试卷代号：805适用对象：无限/近洋航区3000KW及以上船舶二/三管轮（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88题，每题1分，第89题至96题，每题1.5分。一．单项选择题1.Inordertocontrolthermalstresses,sometypeofmodernenginesusepistonswith_______.A.heavywa

2、llandintensivecoolingB.heavywallandnocoolingC.thinwallandnocoolingD.thinwallandintensivecooling2.Theaveragepressureexertedonapistonduringeachpowerstrokeistermed________.A.indicatedhorsepowerB.meaneffectivepressureC.exhaustbackpressureD.compressionpressure3.Theignitionqualityof

3、adieselfuelisindicatedbythe________.A.cetanenumberB.volatilitypointC.viscosityindexD.octanenumber4.Apistoninafour-stroke/cycledieselenginemakesfourstrokesduringeach_________.A.crankshaftrevolutionB.mechanicalcycleofoperationC.periodoftwocombustioncyclesD.cycleoftwoevents5.Cran

4、kshaftsofmediumspeedenginesare_________fromasinglepieceofsteel.A.unusuallysolidweldedB.neverbesolidforgedC.almostinvariablysolidforgedD.almostinvariablybewelded6.Thestartingairenteringthecylinderbeginswhenthepiston_________.A.hasnearlycometotheTDCB.hasjustpasttheTDCC.hasnearl

5、ycometotheBDCD.hasjustpasttheBDC7.Amainbearingconsistsoftwoshellswhicharesecuredbymeansofstudsand_________.A.tierodsB.throughboltsC.leadwiresD.bearingcaps8.Comparedtofour-stroke/cycleengines,two-stroke/cycledieselengineshavethedisadvantageof_________.A.lesseventorqueB.highercy

6、linderheadtemperatureB.fewerpowerstrokesperrevolutionD.greaterweight/sizerequirements9._________controlsthefueloiltemperatureinordertoprovideoilthecorrectviscosityforcombustion.A.TheviscosityregulatorB.ThetemperaturecontrollerC.TheflowmeterD.Thepressureswitch10.Inadieselengine

7、lubeoilsystem,whichofthefollowingpartsshouldbelubricatedfirst?A.CamshaftbearingsB.MainbearingsC.PistoncrownsD.Cylinderwalls11.Alarge,low-speed,mainpropulsiondieselengineusesseawatertodirectlycoolthe_________.A.cylinderheadsB.exhaustvalvesC.scavengingairD.injectors12.Inaturboch

8、arger,inletairvelocityisincreasedinthe_________.A.inletnozzle