大管轮轮机英语真题文档格式.docx
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答题说明:
请选择一个最合适的答案,并将该答案按答题卡要求,在其相应位置上用2B铅笔涂黑。
第1题至68题,每题1分,第69题至76题,每题1.5分,第77题至78题,每题10分。
一、单项选择题:
1.Criticalspeedsoccurringwithintheoperatingspeedrangeofamainpropulsiondieselenginemaybechanged,orhavetheirdamagingeffectsreducedbya/an______.
A.enginesupportvibrationisolatorB.detunerorviscousfluiddamper
C.lightenedcrankshaftflywheelD.sphericallyseatedcrankshaftbearing
2.Precisionenginebearinginsertsaremanufacturedwithasmallportionofthebearingendsextendingbeyondthebearinghousingorcaps.Theinstallationprocessofthesebearingsrequiressufficient______.
A.overlapB.crushC.laporleadD.protrusion
3.Theenginehasoneortwogroupoffuelpumps,dependingupon______.
A.thenumberoffuelvalvesB.thenumberofcylinders
C.thespeedofengineD.thepowerofengine
4.Whichofthefollowingstatementsconcerningthefactorsaffectingignitiondelayiscorrect?
A.Anincreaseinintakeairtemperaturewillincreaseignitiondelay.
B.Anincreaseincoolanttemperaturewilldecreaseignitiondelay.
C.Anincreaseincombustionchamberturbulencewillincreaseignitiondelay.
D.Anincreaseincompressionratiowillincreaseignitiondelay.
5.______providinglubricatingfilms,oilusedinmarinedieselengineshastoremoveheatfromoilcooledpiston.
A.ExceptforB.BesideC.ExceptD.Inadditionto
6.Theabilityofanoiltoseparatecleanlyfromanoilandwatermixtureisreferredtoasits______.
A.precipitationnumberB.neutralizationnumber
C.pourpointD.demulsibility
7.Beforedismantlingthepipe,wouldyou______theoilretainedinthehosewith______?
A.flash/freshairB.wash/freshwaterC.flush/compressedairD.rush/dieseloil
8.Before“standby”isrungontheenginetelegraph,itisusualtogivethemaindieselengineabrieftrial______aheadandastern.
A.withpowerB.onpowerC.withairD.onair
9.Anumberofcylinderlinersareenclosedinonecastironcasingtoforma______.
A.cylindercoverB.cylinderblockC.crankcaseD.bed-plate
10.Betweentheperiodsofinjectionandignitionofthefuel,adieselenginecrankshaftrotatesthroughthe______.
A.detonationperiodB.firingperiodC.delayperiodD.advanceperiod
11.Theturbo-blowercomprisesagasturbineanda______.
A.condenserB.blowerC.sootblowerD.airreceiver
12.Vesselpropellersareclassifiedasbeingrighthandorlefthand.Arighthandpropellerturnsclockwisewhenviewedfrom______.
A.thebowB.thesternC.theportsideD.thestarboardside
13.______therepairinsuchshorttimeisunknowntous.
A.HowtheyfinishedB.Howdidtheyfinished
C.ThathowtheyfinishedD.Thathowdidtheyfinished
14.Inasimplemechanicalgovernor,the______.
A.centrifugalforcerotatestheball-head
B.flyweightcentrifugalforceisbalancedbyspringforce
C.flyweightcentrifugalforceisbalancedbyhydraulicpressure
D.speederspringaloneactuatesthefuelcontrolrod
15.Wearinacylinderlinerisusuallydueto______.
A.frictionB.abrasionC.corrosionD.alloftheabove
16.Agovernorautomaticallycontrolsenginespeedbyregulating______.
A.fuelsupplyB.firingorderC.engineloadD.oillevel
17.Iftheviscosityoftheliquidbeingtransferredremainsconstantasthedischargepressureincreases,therotarypump______.
A.capacitywillincreaseB.capacitywilldecrease
C.suctionpressurewillincreaseD.suctionpressurewilldecrease
18.Thepurposeofthewearingringsusedinacentrifugalpumpisto______.
A.preventaninternalexplosioninthepumpwhenitisoverheated
B.enableavisualinspectionofthepumpwhileitisrunning
C.insureaproperalignmentofthepumpcouplingtothedriver
D.accommodateforfrictionbetweentheimpellerandthecasing
19.Whenaboilerisoperating,thewaterlevelinthegaugeglassreads______whentheboilerisshutdown.
A.lowerthanB.higherthanC.asmuchasD.thesameas
20.Theconcentrationoftotaldissolvedsolidsinthewaterofanauxiliaryboilercanincreaseasaresultof______.
A.seawatercontaminationB.frequentsurfaceblows
C.dissolvedoxygendeaerationD.frequentbottomblows
21.Forapurifierchangingtoagravitydiscwithsmallerholediameterwillmovetheinterfacetowardsthe______.
A.bowlperipheryB.bowlcenterC.uppersurfaceD.lowersurface
22.ForaL.O.purifier,Ifthebackpressureoftheoiloutletistoohigh,theinterfacebetweenoilandwaterinthebowlwill______.
A.beinterruptedB.movedownwardsC.moveoutwardsD.retainoriginalposition
23.Ifabilgepumpfailedtobuildupdischargepressure,youshouldcheckfor___.
A.excessivewaterinthebilgesB.acloggedsuctionstrainer
C.oilinthebilgesD.alloftheabove
24.Theoilsludgeisburntinthe______onboard.I’llshowyoutheashes.
A.boilerB.mainengineC.auxiliaryengineD.incinerator
25.Aclass‘C'
firewouldmostlikelyoccurinthe______.
A.engineroombilgesB.mainswitchboardC.paintlockerD.ragbin
26.Ifthepumpforahydraulicanchorwindlassisoverheating,thecausemaybe______.
A.increasedpumpspeedB.excessivepumpdischargepressure
C.toolowofatiltingboxangleD.lowpumpspeed
27.Thehandsteeringisamethodbywhichthemotionoftherudderiscontrolledwith______.
A.amotor-drivensteeringwheelB.apneumaticsteeringwheel
C.ahand-drivensteeringwheelD.anelectricsteeringwheel
28.Anaxialpiston,variablestrokepumpisusedinavessel'
shydraulicsteeringgear.Underpressure,oilcontinuallyleaksoutfrombetweenthevalveplate/cylinderbarrelandwill______.
A.causelossofhydraulicoilfromthesystem
B.resultinextremedamagetothepump
C.causedamagetothepumpifnotcontinuallydrainedfromthepumpcasing
D.resultinthesystemhighsidepressuretosubstantiallydropoff
29.Withreferencetooperatingafour-ramsteeringgearsystemunderemergencyconditions,whichoneofthefollowingstatementsisincorrect?
A.Onlyonepumpshouldbeusedatanytime
B.Theshipspeedshouldbereducedto70%ofthenormal
C.Watchkeepingofthesteeringgearshouldbeincreased
D.Limitationsofthesteeringgearshouldbeloggedbutthebridgeneednotbeinformed
30.Whichofthefollowingproblemscouldcauseairtoblowoutthroughtheinletairfilterofarunningcompressor?
A.ExcessivecompressioninthecylinderB.Abrokenintakevalve
C.AdirtyinletfilterelementD.Animproperlyadjusteddischargevalve
31.Whenarefrigerationcompressorisinthe'
off'
cycle,thethermalexpansionvalvewill______.
A.alwaysbewideopenwhenthecompressorrestarts
B.continuetooperateasifthesystemwereinoperation
C.remainopenuntilevaporatorpressureequalizes,thencloseuntilthecompressorrestarts
D.alwaysbecompletelycloseduntilthecompressorrestarts
32.Anincreasingheadpressureinarefrigerationsystem,withoutanycorrespondingchangeinthecoolingwaterinlettemperature,wouldprobablybecausedby______.
A.restrictioninrefrigerantpiping
B.airandnon-condensablegasesinthecondenser
C.waterintherefrigerant
D.floodingbackofliquidrefrigerantfromtheevaporator
33.Inarefrigerationsystem,ifthecoolingwatertothecondenserfails,the______.
A.boxtemperaturesolenoidvalvewillcloseB.expansionvalvewillclose
C.compressorwillshutdownD.kingvalvewillopen
34.Thebasictraininginfirepreventionandfirefightingshouldincludethetheoreticalelementswhichshouldcover______.
A.thethreeelementsoffireandexplosion
B.lowerandupperflammablelimits
C.classificationoffiresandapplicableextinguishingagents
D.alloftheabove
35.Sacrificialzincanodesareusedonthesaltwatersideofdieselengineheatexchangersto______.
A.reduceelectrolyticactiononheatexchangermetals
B.keepheattransfersurfacesshinyandclean
C.preventrapidaccumulationofmarinegrowth
D.provideaprotectivecoatingonheatexchangersurfaces
36.Toparallelanincomingmachinetoarunningmachinethereforeitisnecessarytoensurefirstlythat______.
A.twofrequenciesmustbebroughtintophase
B.theincomingmachineacceptsasmallamountofload
C.therunningmachinemustbeunload
D.bothvoltagesareequal
37.Self-exciteda.c.generatorwith‘erroroperated’voltagecontrolsystemsdrawthefullexcitationpowerforthemachineterminals.Thisdispenseswiththecurrenttransformers,reactorsandcapacitorsnecessaryforaccuratecompounding,butrenderstheexcitationsystemvulnerabletovariationsinitsoutputvoltage.Whichofthefollowingiscorrectaboutthegeneratormentionedaccordingtothesentencesabove?
A.Itconsumesnoexcitationpower.
B.Ithascurrenttransformers.
C.Componentsareneededforaccuratecompounding.
D.Itsexcitationsystemisvulnerabletovoltagevariations
38.WhichofthefollowingshouldbetheFIRSTstepinremovingageneratorfromparalleloperation?
A.Tripthegeneratorofftheswitchboard.
B.Turnoffallelectricalequipment.
C.Removetheloadfromthe'
offgoing'
generator.
D.Increasethecyclesofthegeneratorstayingontheline.
39.Thisarrangementis______iftheelementsaredirectlyconnectedtooneanotherandthecontrolactiontakesplacewithouthumaninvolvement.
A.amanualclosedloopB.amanualopenedloop
C.anautomaticclosedloopD.anautomaticopenedloop