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1、15Inatwo-strokeengine,thepistonconsistsofalowerpart,whichisnamedasandusuallymadeof,andaupperpart,whichisreferredtoasandmadeof.low-half,castiron;top-half,heat-resistantsteellow-half,aluminum;top-half,stainlesssteelpistonskirt;castiron;pistoncrown;heat-resistantsteelpistonskirt;aluminum;pistoncrown;st
2、ainlesssteel答案C二冲程柴油机的活塞包含有两部分，下半部分称为活塞裙，通常由铸铁制成；上半部分称为活塞头，通常由耐热钢制成。18Inordertoimprovetheworkingconditionsofthecrossheadbearings,thebearingpressureismadeandtheperipheralspeedismadeinlaterdesigns.smaller,higherB.higher,smallerC.smaller,smallerD.higher,higher答案A为了改善十字头轴承的工作环境，在后来的一些设计里，轴承压力被做的更小，而边缘速度
3、更高（有利于油膜的分布）。21Afull-flow50umfilterisinstalled,sotheinjectionsystemcomponentsonthemainenginearesafeguarded.A. asclosetothemainengineaspossibleasclosetothemainpumpaspossiblejustbeforethefuelvalvejustbeforetheboosterpump答案A一个完全流通的过滤精度为50微米的滤器被设置在尽可能靠近主机的地方，从而保护了喷油系统的部件（不受燃油中杂质的伤害）。22Theboosterpump,whi
4、chsuppliesdieseloilto,shouldhaveapossibilityofbeingpoweredbycompressedairorbyemergencypower.themainenginesB.theauxiliaryenginesC.theemergencygeneratorengineD.theauxiliaryenginesandthemainengine（s）答案B输送柴油给副机的增压泵，应当可以用压缩空气或应急电源驱动。29Inmoderninstallations,themainengineandthestandbyauxiliaryengines.canbe
5、startedatlowtemperatureandarefreefrompreheatingusuallyarepreheatedbysteambeforebeingstartedarekeptataconstanttemperatureandfreefrompreheatingD.arekeptatalowtemperaturetosaveenergy答案C现代化船舶的主机和备用副机冷却水温度保持恒定，不需要预热。34Whenstartinganengine,thecompressedairentersthecylinderwhenthecorrespondingpistonisinpos
6、itionofits.suctionstrokeB.compressionstrokeC.powerstrokeD.exhauststroke答案C起动柴油机时，只有相应的活塞处于动力冲程的时候，压缩空气才进入气缸。大型十字头式柴油机通常有两路润滑系统，有一项功能是气缸油系统所独有的：密封。44“Thisincreaseinchargeairdensityisaccomplishedonmostmoderndieselenginetypesbyuseofexhaustgasturbo-charging,inwhichaturbinewheeldrivenbyexhaustfromtheengi
7、neisrigidlycoupledtoacentrifugaltypeaircompressor.”Accordingtothissentence,wecanknowthatincreaseschargeairdensity,drivesthecompressordirectly.amoderndieselengine,aturbinewheelamoderndieselengine,exhaustgasesacompressor,anexhaustgasturbochargeracompressor,aturbinewheel答案C（答案错，应为D）“充气密度的增加在大部分现代柴油机上是通
8、过使用废气涡轮增加来实现的，一个由来自柴油机排气驱动的涡轮（透平）刚性连接着一个离心式的压气机。”根据这句话，我们可以知道，压气机增加了充气密度，而涡轮（透平）直接带动压气机。50Whenthedirectionhandleofthetelegraphismoved,therelativepositionofcamshaftandcrankshaftwillbe.A.changedaccordinglyB.unchangedC.positionedaheadD.positionedastern答案A当车钟的转向手柄被移动，凸轮轴和曲轴的相对位置也会因此发生改变。58Thedifferenceb
9、etweenFixedpitchpropeller（FPP）andControllablepitchpropeller（CPP）isinthat.A. forFP,oncefitted,thepositionofthebladescanalsobechangedinoperationforCP,oncefitted,thepositionofthebladescanalsobechangedinoperationtheCPtypehasarelativelysmallerhubcomparedwiththeFPpropellers.theFPtypehasarelativelylargerhu
10、bcomparedwiththeCPpropellers.答案B固定螺距螺旋桨和可调螺距螺旋桨的区别是：对于可调螺距螺旋桨来说，在工作过程中，桨叶的位置是可以改变的。63Acommonrailenginehasonlyoneortwohighpressurepumpsinoperationatthesametime,andtheinjectionintoeachcylinder.cantbecontrolledverypreciselycantbecontrolledasflexiblyastheseparatepumpsystemcanbecontrolledasflexiblyasthes
11、eparatepumpsystemcanbecontrolledmorepreciselyandflexibly答案D共轨柴油机仅使用一个或两个高压泵供油给所有气缸，喷油可以被控制的更精确和更灵活。65Tomeetthemarketrequirements,amarinedieselengineshouldnotbeof.A. bigsizeB.fueleconomyC.lowspeedD.highpower答案A为了满足市场的需求，船用柴油机尺寸不能过大。69isnotafeatureoftheelectroniccontrolledengines.A.Lowerfuelconsumptio
12、nB.BetterbalancedcylinderpowerC.AshorteroverhaulperiodD.Lesssmokeemission答案B各缸功率更平衡不是电控柴油机的特色。76Thedefectiveplaceinthefurnaceshouldbewithfirebricks.A. pavedB.cleanedC.weldedD.dismantled答案A炉膛内有缺陷的部位应当砌上耐火砖85Whatisthefirstthingyouwouldcheckontakingoverawatch?thebilgesB.theperiscopeC.thewaterlevelD.the
13、oilpressure答案C你在接班时首先会检查什么呢？（水箱、水柜）水位95Whentheheatloadbeginstoincrease,theneedlevalveofanexpansionvalvewillA.moveinanopeningdirectionB.moveinaclosingdirectionC.eitheropenorcloseD.notmoveatall答案A当热负荷开始增加时，热力膨胀阀的针阀会开大。97Thethermostaticvalvehasathrottlingaction,thatistosaythevalvecan.stoptherefrigerant
14、fromflowingB.forcetherefrigeranttoflowC.causetherefrigerantpressuretoriseD.causetherefrigerantpressuretofall答案C（答案似乎错，应为D）热力膨胀阀有一个节流的动作（关小），即阀会造成制冷剂压力降低。100Ifthecompressorrunscontinually,thecausemightbethe.high-pressurecutoutswitchisjammedopenlow-pressureswitchisjammedshutthermalbulbisnotoperatingpr
15、operlyscaletrapisclogged答案A（答案似乎不正确，工作正常的压缩机起停与高压继电器无关）如果制冷压缩机持续运转，可能的原因是高压继电器卡死在了开启的位置。109Ifthetemperatureintheiceboxistoohigh,thetroublecouldbe.acloggedscaletrapB.airinthesystemC.automaticcontrolsnotfunctioningproperlyinsufficientcoolingwatertothecondenser答案C如果冷库库温过高，可能的原因是自动控制装置运转不正常。110Ifnogaske
16、tsareusedinthepipingjointsofaFreonsystem,thejointsmustbe.A.finishedjointsB.weldedjointsC.groundjointsD.solderedjoints答案C如果氟利昂系统的管路接头不使用垫圈的话，那这些接头一定是磨口接头。115TheexpansionvalveonaFreonsystemcontrolsthe.A.superheatofthegasleavingthecompressorbackpressureintheevaporatortemperatureoftheiceboxsuperheatofthegasleavingtheevaporator答案D氟利昂系统的膨胀阀控制着离开蒸发器的冷剂气体的过热度。116Thescaletrapislocatedbetweenthe.kingvalveandthee
