轮机英语考证模拟题

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1、第一篇轮机英语考证模拟题Unit1MainPropulsionPlant(主推进装置）Lesson1ShipsandMachineryships(船舶和机械)1.Theauxiliaryengineanda.c.generatorcanbeconnectedwith____A,camB.crossheadC.bulgeD.coupling注：副机和发电机用联轴节连接，故选D。2.Thetermmediumspeeddieselengineiscurrentlytakentomeananenginewithanoperat-ingrotationalspeedofrpm.A.below300B

2、.above1200C.between300to1200D.below1200注：术语"中速机"是指运行速度介于300-1200rpm之间的发动机。（也有说法为300-1000rpm),只能选C，故选C。3.Therotatingrangeofthelowspeeddieselengineisusuallylowerthan.A.100rpmB.200rpmC.300rpmD.500rpm注：术语"低速机"是指运行速度小于300rpm的发动机，故选C。4.Amongthemainpropulsionunitsonboardtheshipwiththesamecapacity，thelight

3、estoneis.A.steamengineB.steamturbineC.gasturbineD.dieselengine注：船舶使用的各种类型的主推进装置中，如果产生的功率相同，装置重量最轻的是燃气轮机。（比功率大是燃气轮机的优点，同样功率，内燃机中重量最轻，体积也最小。)故选c。5.Concerningdieselpropelledvessels,theasternpoweristoprovideforcontinuousoperationastem.A.equaltothatavailableforaheadoperationB.at70percentoftheaheadrpmatr

4、atedspeedC.whileunderwayandunderallnormalconditionsD.at70percentoftheaheadrpmofaveragecontinuousseaspeed注：柴油机驱动的船舶，倒车转速一般是正车额定转速的70%-80%,故选B。6.Adieselengineisoperatingat1800rpmanddrivingapropellerat600rpm.Whatisthespeedreductionratio?A.0.30to1B.3.00to1C.3.33to1D.33.0to1注：减速齿轮箱的减速比=曲轴转速/螺旋桨转速=1800/6

5、00=3，故选B。7.Enginedisplacementisequaltothecylinder.A.areatimesthestrokeB.areatimesthestroke，timesthenumberofcylindersC.volumetimesthestrokeD.volumetimesthestroke，timesthenumberofcylinders注：发动机的排量=气缸面积x活塞冲程x气缸数目，选B。8.Inusingreductiongearstoobtainefficientpropellerspeeds，.A.theymustbelocatedattheafter

6、endoftheengineB.theycanonlybeusedwithoneengineatatimeC.theyeliminatetheneedforcontrollablepitchpropellersD.theyareconnectedtotheenginewithaflexiblecoupling注：减速齿轮与发动机采用柔性联轴节连接，选D。9.Maximumhorsepowerofadieselengineisattained.A.whentheenginerpmispulleddownbyoverloadB.atratedenginerpmC.at95%ofratedengi

7、nerpm233A.at95%ofaproperlyadjustedgovernorrpmwiththeengineunderfullload注：柴油机的最大功率是在其额定转速时产生的，故选B。7.*Theterm"moderatespeed"waspreviouslyinterpretedasmeaningaspeedwhichwouldenableavesselwithinhalftherangeofvi