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1、高级汽车修理工试卷2（SeniorAutoEngineer2）First,multiple-choicequestions(first~60questions).Choosethecorrectanswerandputthecorrespondinglettersintothebracketsinthequestions.1pointsforeachquestion.60points!):1.thevaluemeasuredbyapressuremeterisgas.(A)tablepressure(B),absolutepressure(C),vacuum(D),atm
2、osphericpressureThetheoreticalcycleofthe2.dieselengineishigherthanthetheoreticalcycleefficiencyofthegasolineengine.(A)mixedheatingcycleismoreefficientthanconstantvolumeheatingcycle.(B)dieselenginehashighercompressionratio(C)thepreexpansionratioofgasolineengineiszero(D),andthepressureriser
3、atioofdieselengineiszero3.themaximumvalueofthecoefficientofinflationoftheintakevalveiscorrespondingtothedecreaseofthespeed.(A)lateclosureangledecreased(B),andlateclosingangleincreased(C)duringtheopeningperiod,thesectionareaincreases(D),whilethesectionareaattheopeningstagedecreases4.whenth
4、eengineintakevalveopensearlyandclosesatacertainangle,therelationshipbetweenthecoefficientofchargeandthespeedchangesis().(A)increaseswiththeincreaseofspeed(B)anddecreaseswiththeincreaseofspeed(C)themaximum(D)constantatacertainintermediatespeed5.attheendoftheintakeprocess,thepressureinthecy
5、linderisalways().(A)greaterthanatmosphericpressure(B)equaltoatmosphericpressure(C)lessthanatmosphericpressure(D)isindependentofatmosphericpressure6.comparedwiththegasolineengine,themixtureofdieselengineisformedin().(A)intakestroke(B),theentirecompressionstroke(C)compressionstrokeend(D)int
6、akeandcompressionstrokeThelowerthespeedatwhichthemaximumtorqueofthe7.gasolineengineis,thecardoesnotchangegears,Thepotentialtoovercomeresistance.(A)thesmaller(B)isnotaffectedbyrotationalspeed(C),thelarger(D)general8.intheloadcharacteristicsofthegasolineengine,thehourlyfuelconsumptionofthee
7、ngineisrelatedtoGT.(A)ignitionadvanceangle(B),enginespeed(C),excessairfactor(D),adjustmentofthecarburetor9.themostimportantdynamicindexofcitybusesis().(A)maximumspeed(B),startingtime,accelerationtime(C),overtakingaccelerationtime(D),maximumclimbingcapacity10.whenthe
