11规则大管轮英语模拟二和模拟二的答案Word下载.docx

11规则大管轮英语模拟二和模拟二的答案Word下载.docx

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C.excessiveoilleakageduringperiodsofincreasedblow-by

D.sub-coolinginternalcomponents

3.Oneofthefactorslimitingtheamountofloadwhichcanbeputonamodernmarinedieselengineisthe___b_____.

A.governorsensitivityB.exhausttemperature

C.fuelinjectionpressureD.speedofthecamshaft

4.Whichofthelistedfactorswillindicatethemostabouttheabilityofafueltoigniteinadieselengine?

d

A.ViscosityB.SulfurcontentC.PourpointD.Cetanenumber

5.Theprimaryfunctionofafueldeliverycheckvalveassemblyisto___b_____.

A.deliverproperfuelquantitytotheinjectionnozzle

B.providerapidfuelinjectioncutoff

C.controlfuelquantityenteringthepumpbody

D.controlfuelpressuredeliveredtothecombustionchamber

6.Foranypistonringtooperatesmoothlywithoutscuffing,theringmustbe___b___.

A.ofamaterialharderthanthecylinderliner

B.properlylubricated

C.preventedfromcompressing

D.preventedfromrotatingduringengineoperation

7.Corrosioninhibitorsand/orsolubleoilsareaddedtodieselenginecoolingsystemsto___d____.

A.maintainlowpHinthecoolingwaterB.reducethecoolingwatertemperature

C.increasecoolingwaterhardnessD.formaprotectivefilmonmetalsurfaces

8.Inatwo-stroke/cycledieselengine,theprocessofscavengingbeginsasthe_b____.

A.pistonnearsandpassesTDCB.latterpartofthedown-stroke

C.pistonpassesBDCD.earlypartofthedown-stroke

9.Thetimingofdieselengineairstartingvalvesiscontrolledby____c____.

A.theairstartvalvetiminggearsandrodsB.acylindercheckvalve

C.theairdistributorD.anairmanifoldpoppetvalve

10.__c___suppliespilotairtocontrolthecylinderairstartvalves.

A.AnaircompressorB.AnindicatorcockC.AnairdistributorD.Asafetyvalve

11.If_b____takenatregularintervals,anyunequaldistributionofloadwillbeeasilyfoundout.

A.differentialofcrank-websisB.indicatordiagramsare

C.lubeoilreadingoutisD.misalignmentofcrank-throwsis

12.Beforeshuttingoffthefuelsupplytostopamediumorhigh–speeddieselengine,whyisitnecessarytoallowtheenginetoidleforafewminutes?

a

A.Topreventinternaldamagefromlocaloverheating

B.Toensurethefuelnozzlesareflushedclean.

C.Toclearthesmokestack.

D.Toletthewasteheatboilerreduceitsrateofsteamgeneration.

13.Auxiliarydieselenginescanbeautomaticallyshutdownasaresultof___b____.

A.lowlubeoiltemperatureB.lowlubeoilpressure

C.highexhausttemperatureD.highcoolingwaterpressure

14.Thelongertheignitiondelayperiodresultingfromimproperuseoflowcetanefuel,the___d____.

A.lessfuelwillenterthecylinderB.higherthecylindercombustiontemperature

C.morecompletethefuelcombustionD.morerapidtheriseincombustionpressure

15.Asubstantialincreaseincrankcasepressurecouldbeanindicationof__c____.

A.excessivelubeoilpressureB.theproperseatingofnewrings

C.aworncylinderlinerD.amalfunctioningcylinderreliefvalve

16.Persistentknockinginonecylinderofadieselenginecouldbecausedby__d___.

A.alowloadonthatcylinderB.sluggishpistonringaction

C.excessivepistoncrowncoolingD.excessiveclearanceofpistonpin

17.Whichofthefollowingproblemswilloccuriftheneedlevalveinafuelinjectionnozzlesticksintheopenposition?

A.FuelinjectiontimingwillchangeB.Nozzleoperationwillbeunaffected

C.FuelwillleakintothedrainlineD.Fuelwillnotbedelivered

18.Highcylinderfiringpressure,accompaniedbylowexhausttemperature,canresultfrom_d__.

A.improperfuelrackpositingB.lengthyexhaustvalveduration

C.extendoperationatlightloadD.excessivelyearlyinjectiontiming

19.Themostcommoncontaminationofgovernorhydraulicfluidis_b____.

A.moistureB.dirtC.acidD.air

20.Themainpropulsiondieselenginejacketwatertemperaturerisesabovenormal,withtherawwaterseasuctionandtheexpansiontankwaterlevelbeingnormal.Whichofthefollowingproblemsismostlikelythecause?

A.Faultythermostaticbypassvalve

B.Erodedzincpencilsintheheatexchanger

C.Steamformationintheexpansiontank

D.Excessiveleakagefromjacketwaterpumpseal

21.Onceatrunkingfireisdetectedtheengineshouldbesloweddown.Onnoaccountshould__b___.

A.thecrankcasebeopenedupB.thetrunkingbeopenedup

C.theenginebesloweddownD.thetrunkingnotbeopenedup

22.Iftheenginedoesstartonair,butcombustiondoesnotimmediatelybegin,thecausemaybe_b__a__.

A.failureofthefuelpumpsB.startingairpressuretoolow

C.stopvalveinairlineclosedD.theturninggearstillengaged

23.Ifadieselenginewererunningat20%overloadwithasmokyexhaust,youshould___c__.

A.stoptheengineimmediatelytopreventdamage

B.increaselubeoilpressure

C.slowtheengineallowingittograduallycool

D.decreasethecoolingwatertemperaturetothewaterjacket

24.Inreducingenginespeedtoanefficientpropellerspeedbytheuseofreductiongears,__c___.

A.speedandtorquearebothreduced

B.speedisreducedandtorqueremainsunchanged

C.speedisreducedandtorqueisincreased

D.speedissometimesunchangedwhiletorqueisincreased

25.Oilpressureinthelubricationsystemisdthanthestaticseawaterheadtoensurethat

seawaterthestern-tube.

A.lowerthan/canlubricateB.lowerthan/cancool

C.higherthan/canenterD.higherthan/cannotenter

26.Thepropellerispushedontothetubeshafttaperandmadetightby_c____.

A.amechanicalsealB.keywayandkeyC.anutD.shrinkage

27.Coldweatherstartingofadieselengineismoredifficultthanwarmweatherstartingduetoc.

A.useoflowviscosityoilincoldweather

B.increasedmoisturecontentofinletairincoldweather

C.increaseddragofpistonsandbearingsduetoincreasedoilviscosity

D.highercompressionpressuresreachedduetosmallerclearancesexistingintheengineduringcoldweather

28.Inthenavigation_b___causetheshaftingoverloadmosteasily.

A.stoppingthemainenginesuddenly

B.changingthemainenginerunningdirectionsuddenly

C.thesailingfromtheshallowwaterareatothedeepwaterarea

D.theship’strimtoomuch

29.Thebearingoftailshaftsealingequipmentwhichadoptstheoilnaturecirculationishot,thereasonis.b

A.therotatespeedfluctuationB.theventilationtubeclogged

C.themainengineacceleratesofastD.stormywaves

30.Theheatidentifiedbyonlyachangeintemperatureisknownas__a___.

A.sensibleheatB.latentheatC.totalheatD.residualheat

31.Excessiveoilfoaminginthecrankcaseofarefrigerationcompressorismostlikelytooccurwhenthecompressor.d

A.hasruncontinuouslyforalongperiodB.suctionpressureisbelownormal

C.oillevelisbelownormalD.startsafteralongidleperiod

32.Ifanexpansionvalveisadjustedfortoolowasuperheatvalueb.

A.theefficiencyoftheunitwillbeincreased

B.toomuchliquidwillbepassedbacktothecompressor

C.theboxtemperaturewillincreasecausinganexpansionofthevolumeofair

D.therefrigerationeffectwillincreasecontributingtouncontrolledboxtemperatures

33.Acrackeddiaphragminathermostaticexpansionvalvewillcausethevalveto___d__.

A.returntoaneutralpositionB.floodtheevaporatorC.openD.close

34.Ifarefrigerationcompressorisshortcyclingonhighheadpressure,youshould.b

A.purgethecondenserifthewatersideisdirty

B.checkforproperwaterflowthroughthecondenser

C.increasethehighpressurecutoutsetting

D.reducethecoolingwaterflow

35.Arefrigerationsystemisequippedwithareciprocatingcompressorandawatercooledcondensingunit.Ifthesystemisovercharged,theresultinghighheadpressurewillbecausedby.bd

A.theexpansionvalveoverfeedingtheevaporator

B.aleakingcompressorsuctionvalve

C.anincorrectlyadjustedhighpressurecutout

D.refrigerantfloodingthecondenser

36.Acentrifugalfueloilpurifiershouldbeshutdownif___c_____.

A.moresealingwaterisneeded

B.thecoverclampneedstightening

C.thepurifierhasabadvibrationwhenstarted

D.waterisdischargedfromtheoverflowline

37.Oneofthereasonsthatcauseoilflowedfromsludgeoutletofaself-cleaningseparatoris_b__.

A.sealwatersupplybecutoffB.make-upwatersupplybecutoff

C.oiloutletvalveclosedornotopensufficientlyD.theflowrateofoilywateristoomuch

38.Amongthebasiccategoriesofequipment,whichofthefollowingareusedtoallowthehydraulicenergytobecontrolled?

db

A.hydraulicpumpsB.valvesC.hydrauliccylindersD.hydraulicmotors

39.Inaradialpistonpump,reversalandcontroloffluidflowareaccomplishedbymovingthe__d__c_.

A.centralvalveB.radialplungerC.floatingringD.cylinderbody

40.Asthedesignatedrudderangleisbeingachieved,asaresultoftheoriginalcommandinput,thesteeringge