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1、高级汽车修理工试卷6（Seniormechanictest6）First,multiple-choicequestions(first~60questions).Choosethecorrectanswerandputthecorrespondinglettersintothebracketsinthequestions.1pointsforeachquestion.60points!):1.inthetheoryofmixingheating,theheatefficiencyishigherifthecompressionratioisequaltoth
2、etotalheatingquantity,andifthepressureriseratioisincreased().(A)constant(B)becomeshigh(C),decreases(D),becomeshighfirst,thenbecomeslow2.thepurposeofclosingtheintakevalveis().(A)reducingtheflowresistance(B)oftheintakeair,andincreasingthevalveliftoftheintakevalve(C)makefulluseofthefl
3、owinertiaofintakeairflow(D)toimprovetheeconomyoftheengine3.inordertoimprovethecoefficientofinflation,theresistanceoftheintakesystemshouldbereduced,whiletheintakepassageofthewholeintakesystemisthesmallestandvariescontinuously,andthemaximumflowresistanceshouldbeconsideredfirst.(A)car
4、buretor(B)intakevalve(C)intakemanifold(D)airfilter;4.whichofthefollowingconcentrationsmakesthecombustionmorecompleteandthefuelconsumptionratelowest(?).(A)alpha=0.85to0.95(B)alpha=1(C)alpha=1.05to1.15(D)alpha<0.85to0.95;5.inthecombustionprocessofadieselengine,thecrankshaftangleisgen
5、eratedfromthefirstflamecentertotherapidcombustionofthemixtureinthecylinder.Whenthepressureinthecylinderreachesthehighestpoint,itiscalled().(A)lateignition(B),quickburning(C),slowfire(D),andafterburning6.,inordertoreducetheroughnessofcombustion,thedirectinjectiondieselengineselectst
6、hefuelinjectionlaw,requiresfuelinjection().(A)maintainahighinjectionrate(B)andmaintainalowinjectionrate(C)firsturgent,thenslow(D),firstslow,thenurgent7.gasolineenginetorquereservecoefficient(diesel)torquereservefactor,soitdoesnotneedtochangetheuseoflow-end,toovercomethepotentialofr
7、esistance(A)lessthan(B)greaterthan(C)equalto(D)first,greaterthanlater,lessthan8.accordingtotheignitionadvanceangle,whichofthefollowingstatementsistrue?.(A)theoptimumignitionadvanceangleincreaseswiththeincreaseofload(B),andtheoptimumignitionadvanceangledecreaseswiththeincreaseofload
8、(C)theoptimumignitionadvan
