雨课堂学堂在线学堂云《Reliability and Intelligent Maintenance（可靠性与智能维护）（哈尔滨工业）》单元测试考核答案

第1题Independentoftheproductmaintainabilitydefinitionisoption().APrescribedconditionBPrescribedtimeCPrescribedprocedureDPrescribedplace第2题Ingeneral,whichofthefollowingtimefactorsismainlyconsideredformaintainability?()AWaitingtimeformaintenancepersonnelandcomponents.BTransportationtimeofmaterialsandequipment.CWorkshopmanagementandschedulingtime.DManualrepairtimeoffaultunitofthesystem.第3题Availabilityonlyindicatestheprobabilitythatthecomponentisnowinanonfaultstate,regardlessofwhetherthecomponenthasfailedbefore.Therefore,theavailabilityofthesystemisnotlessthanthereliability.Isthisstatementcorrect?()ACorrectBWrong第4题ForanyeventAandB,thefollowingdescriptioniscorrect().

AIfABisnotempty,thenAandBmustbeindependentBIfABisnotempty,thenAandBmaybeindependentCIfABisempty,thenAandBmustbeindependentDIfABisempty,thenAandBmustnotbeindependent第5题Thecorrectstatementaboutthenormaldistributionis().

AThefailurerateλforanormaldistributionisequaltoaconstantBThenormaldistributionissymmetric,anditsmainparametersaremeanμandvarianceσ2,denotedasN~(μ,σ2)CThemeanμdeterminesthepositionofthenormaldistributioncurveandrepresentsthecentraltendencyofthedivisionDThevarianceσ2determinestheshapeofthenormaldistributioncurveandrepresentsthedegreeofdispersionofthedistribution正确答案：BCD第6题Thecorrectstatementaboutparameterestimationis().APointestimatorsforpopulationparametersuseasinglevalueofthestatistictoestimatethevalueofalocationparameter.BInthecaseofagivenconfidencelevel(1-α),themethodofestimatingtheupperandlowerconfidencelimitsofunknownparametersisbilateralintervalestimation,alsoknownasbilateralestimation.CInthecaseofagivenconfidence(1-α),themethodofonlyestimatingthelowerorupperconfidencelimitoftheunknownisone-sidedintervalestimation,alsoknownasone-sidedestimation.DAlloftheabovearecorrect第7题Whichofthefollowingmethodscangreatlyimproveproductreliability?().ALowertheconfidencelevelBReducevariablesCIncreasethesamplesizeDExtendthetesttime第8题Theprobabilityofasinglemissilehittingthetargetis0.7,andwhenitisfiredthreetimesinarow,theprobabilityofhittingthetargetis().A0.889B0.923C0.973D0.98第9题Abatchofboltsisthreepercentdefectiveandabatchofnutsistwopercentdefective.Aunitisformedwithonenutandonebolt.Findtheprobabilitythatarandomlyselectedunitisdefective.A0.05B0.0006C0.0494D0.0506第10题Inherentavailabilityexcludes:I.CorrectivemaintenancedowntimeII.PreventivemaintenancedowntimeIII.LogisticdowntimeIV.AdministrativedowntimeA

IIandIIBIIandIVCIandIIDIIIandIV第1题ThecircuitconsistsofbatteryXconnectedinserieswithtwoparallelbatteriesY.LettheprobabilityofbatteryXandYdamagebe0.3and0.2respectively,andwhethereachbatteryisdamagedornotisindependent.Thentheprobabilityofcircuitfailureduetobatterydamageis().A0.662B0.268C0.328D0.732第2题Nomatterhowcomplexthestructureofthecomponentsinthesystemis,thesystemreliabilitycanbedecomposedintoseveralseriesorparallelrelationships.Isthisstatementcorrect?()ACorrectBWrong第3题Anaircraftengineiscomposedofthreemodules,andthefailurerateisconstant,whereλ1=0.002/h,λ2=0.015/h,λ3=0.0025/h.Then,thereliabilityfunctionoftheengineis().AR(t)=e^0.0105tBR(t)=e^-0.0105tC

R(t)=e^0.0195tDR(t)=e^-0.0195t第4题Thefailuredistributionwithconstantfailurerateiscalled(),whichisoneofthemostimportantreliabilitydistributionfunctions.

AWeibulldistributionBLognormaldistributionCNormaldistributionDExponentialprobabilitydistribution第5题IfthereliabilitydistributionofamotorisexponentialandtheMTBFis7500hours,theprobabilityofnofaultinonemonth(30days)is().A0.832B0.908C0.946D0.882第6题Intheseriessystem,thesystemreliabilitymustnotbegreaterthanthereliabilityvalueofeachcomponent.Isthisstatementcorrect?()A

CorrectB

Wrong第7题Foraparallelsystemcomposedoftwoormorecomponents,thesystemwillfailonlywhenallcomponentsinthesystemfail.Isthisstatementcorrect?()ACorrectBWrong第8题LetthepopulationX~N(μ,0.09),randomlydraw4samples,andtheaveragevalueoftheobservedvalueisx_bar=5,thenthe95%confidenceintervalofthepopulationμis().KnownP

σisthestandarddeviationofX,andZ0.025=1.96.A[4.706，5.294]B[4.706，5.942]C[4.670，5.294]D[4.670，4.706]第9题ThefailuredistributionfunctionofaproductisF(t)=1−e−(tη)2,whereη>0,thenthefailureratefunctionoftheproductis().

AIncreasedovertimeBDecreasingovertimeCConstantDIncreaseanddecrease第10题Asystemis95%reliablewhentheMTBFis500hoursandthemeantimetorepairis().A

22

hoursB26

hoursC133

hoursD167

hoursCH3Exercises第1题Asshowninthefigurebelow,thesystemconsistsofthreeunits,andallfollowsexponentialdistribution.Thefailurerate,λ3=1×10−4/h,andtheMTBFofthesystemis().

A1159.4hB860.9hC878.2hD281.2h第2题Theparallelseriessystemis

showninFig.(a)andseriesparallelsystem

isshowninFig.(b).Eachofthetwosystemscomposedof2nunits.Assumingthatthefailureofeachunitisindependent.Reliabilityofparallelseriessystemis().ABCD第3题Reliabilityofseriesparallelsystem

is().ABCD第4题

Ifamotorhas6faultswithin45000hoursofoperationandisrepaired,itsMTBFis().A9000hB7500hC15000hD5625h第5题Ifthenumberoffailuresiscompletelydeterminedbythenumberofindependentrandomeventsandhasnothingtodowiththesystemlife,itcanbeinferredthatthefailurerateofthesystemisconstant.Isthisstatementcorrect?()ACorrectBWrong第6题Thefailurerateofamicrowavetransmitterisconstant,whichis0.00034timesperhour,soitsreliabilityfunctionisR(t)=e^-0.00034t,thenitsreliabilityforcontinuousoperationfor30daysis().A0.77549B0.85692C0.82561D0.78286第7题Asystemconsistsoffivedevices,asshowninthefigurebelow.ThereliabilityoftheXdeviceis0.9900.Thereliabilityoftheotherfourdevicesisthesame.Ifthesystemreliabilitytargetis0.9896,thentheminimumreliabilityofdeviceYisatleast()?A0.980B0.985C0.990D0.995第8题Thexandyaxesofthebathtubcurverepresent().

Atime,reliabilityBReliability,timeCTime,HazardRateDHazardrate,time第9题Thefollowingdistributionsarecontinuousrandomvariables:().ABinomialdistributionBNormaldistributionCExponentialdistributionDPoissondistribution正确答案：BC第10题Theroleofreliabilitypredictionis().AChecktherationalityofthereliabilityassignmentBVerifywhetherthereliabilityindexrequirementsaremetCQuantitativeAllocationReliabilityDFindDesignWeaknesses正确答案：ADCH4Exercises第1题ProactiveactionmustbeimplementedwhenRPN>100?()ATureBFalse第2题FMEAisa(

)tool?

AProcessanalysisBResourcesharingCRiskassessmentDProjectplanning第3题WhatfactorsinfluencetheresultsofRiskPriorityNumber(RPN)?()ASeverityBProbabilityCDetectabilityDMaintainability正确答案：ABC第4题WhichofthefollowingoptionsbelongstoFailureModeandEffectsAnalysis(FMEA)?()ASystemFailureModeandEffectsAnalysisBDesignFailureModeandEffectsAnalysisCManufactureFailureModeandEffectsAnalysisDProcessFailureModeandEffectsAnalysis正确答案：ABD第5题HowmanyratinglevelsforRPNfactors?()A8B5C3D10第6题WhatistheformulaforcalculatingRPN?()ASeverity*Probability*MaintainabilityBProbability*Detectability*MaintainabilityCSeverity*Detectability*MaintainabilityDProbability*Detectability*Severity第7题TheFMEAisdynamicinformationwhenstartedandcanbeadjustedasneeded?()ATureBFalse第8题WhichofthefollowingprocessesinvolveFMEA?()AProductfailedBProduct/processdesignCProductverificationDCustomerfeedback正确答案：ABCD第9题WhenconductinganFMEAtherpnvalueiscalculatedusingtheformularpn=SxOxD.ThesymbolsS,OandDstandfor()Asensitivity,occurrence,detectionBseverity,occurrence,detectionCseverity,operable,detectionDseverity,occurrence,development第10题WhichofthefollowingarethetypicalcomponentsinaFMEAusedtodefinethepriorityforaddressingpotentialfailuremodes?AOccurrence,Severity,PreventionBOccurrence,Prevention,SafetyCOccurrence,Severity,DetectionDOccurrence,Safety,DetectionCH5Exercises第1题Theminimumcutsetofthesystemshownbelowincludes().

Ax1x3,

x2x4,x1x4x5,x2x3x5Bx1x2,x3x4,x1x4x5,Cx1x2x3,x4x5,Dx1x2x5,x1x4x5第2题Theminimumcutsetis()fortheoccurrenceoftopevent.AsufficientandnecessaryconditionsBsufficientandunnecessaryconditionsCnecessaryandinsufficientconditionsDunnecessaryandinsufficientconditions第3题Whichofthefollowinglogicaloperationsarecorrect().

AA*(B+C)=A*B+A*CB(A*B)+(C*D)=A*B+C*DC(A+B)*(C+D)=A*C+B*DDA*(B+C)=A*B+C正确答案：AB第4题FTAmainlyincludeeventsymbols,(

)andtransfersymbols.

ASetsymbolsBArithmeticsymbolsCLogicalsymbols第5题

Faulttreeisadirectionaltreedescribingthe()offailure?

AOccurrenceprocessBCausalrelationshipCCorrelationDCause第6题Faulttreeanalysisisa()riskAssessmentmethod.

ATopdownanddeductiveBBottomupanddeductiveCTopdownandinductiveDBottomupandinductive第7题WhichofthefollowingstatementsaboutFTAiscorrect?()AAssumesfailureofthefunctionalityofaproductBAssumesfailureofcomponentofaproductCIdentifiestherootcauseoffunctionalfailureDIdentifiesfunctionalfailureasaresultofcomponentfailure正确答案：AC第8题Infaulttree,()indicatesthebasiccauseevent,()indicatestheundevelopedevent.()ARectangle,rhombusBEllipse,rectangleCCircular,rhombusDRhombus,circular第9题Inafaulttreeanalysis(FTA)twosystemsarejoinedinparallelsothattheoverallsystemwillnotfailuntilbothsystemsfail.Thefirstsystemhasareliabilityof0.9805.Thesecondsystemhasareliabilityof0.9795.Whatisthereliabilityofthenexthighersystem?A0.9604B0.0396C0.9996D0.4000第10题Thecorrectstatementaboutthefaulttreedescendingmethodis().ATheANDgateonlyincreasestheorderofthecutsetBTheORgateonlyincreasestheorderofthecutsetCTheANDgateonlyincreasesthenumberofcutsetsDORgatenotonlyincreasesthenumberofcutsets,butalsoincreasestheorderofcutsetsCH6Exercises第1题Thefactorsaffectingproductmaintainabilitycanbedistinguishedaccordingtothedegreeofimportance.Therelativelylowerimportanceofthefollowingfactorsis().AproductmodularityBequipmenttypeCproductinterchangeabilityDlevelofmaintenanceteam第2题Inthefollowingmaintenancetypes,thecorrectorderofmaintenancelevelfromlowtohighis().①Maintenanceprevention.②Correctivemaintenance.③Preventivemaintenance.

④ContractedMaintenance.⑤Autonomousmanagement.A

④,①,②,③,⑤B

⑤,③,②,①,④C⑤,②,③,①,④D④,③,②,①,⑤第3题Whichofthefollowingoptionsisnotaprincipleobjectiveofsystemmaintenance？()AMinimizethefrequencyofsysteminterruptionandtheseverityoftheconsequences.BAchieveproductqualitybyadjustingandrepairingequipment.CControlthemaintenancecost,nomaintenanceworkisrequiredbeforethesystemisinterruptedbyfault.DMaximizeproductioncapacitythroughhighutilizationofthesystem.第4题Generally,thehigherthedegreeofpreventivemaintenanceofthesystem,thelowerthecorrespondingmaintenanceandrepaircost.Isthisstatementcorrect?()ACorrect.BWrong.第5题()iscarriedoutwithinpredeterminedtimeintervals,whichareestimatedbasedonhistoricaldata,systemfailuretimedistribution,economicmodeloravailabilitymodel.APreventivemaintenanceBCorrectivemaintenanceCAdaptivemaintenanceDPerfectivemaintenance第6题Amongthefollowingfaultcauses,themostunlikelycauseofgeartransmissionmechanismfailureis().AabnormalstressBcapacitorshortcircuitCagingandwearDmaterialfatigue第7题Inthefollowingmaintenancetypes,thecorrectorderofmaintenancelevelfromlowtohighis()①Maintenanceprevention.②Correctivemaintenance.③Preventivemaintenance.④ContractedMaintenance.⑤Autonomousmanagement.A④,①,②,③,⑤B⑤,③,②,①,④C⑤,②,③,①,④D④,③,②,①,⑤第8题Generally,thehigherthedegreeofpreventivemaintenanceofthesystem,thelowerthecorrespondingmaintenanceandrepaircost.Isthisstatementcorrect?第9题Thefactorsaffectingproductmaintainabilitycanbedistinguishedaccordingtothedegreeofimportance.TherelativelylowerimportanceofthefollowingfactorsisAproductmodularityBequipmenttypeCproductinterchangeabilityDlevelofmaintenanceteam第10题Whenisahighlyacceleratedlifetest(HALT)usuallyperformed?AWhenearlyprototypesorengineeringmodelsareavailableBWhenfinalprototypesorengineeringmodelsareavailableCWhenfirstproductionunitsareavailableDWhenunitsproducedperiodicallyduringproductionareavailableCH7Exercises第1题Theintegratedpredictiveproductivityisfocuson().AOverallProductivityBEquipmentUtilizationCIntelligentMaintenanceDAlloftheabove第2题WhichofthefollowingisassociatedwithIMS?()AERPBSCM,CCRMDAlloftheabove.第3题Whatistherequirementforpredictivemaintenance?()APredictiveintelligenceBSynchronizationintelligenceCOperationsintelligenceDAlloftheabove第4题IMSistheshortforintelligentmaintenancesystems.Isthisstatementcorrect?()ACorrectBWrong第5题WhichofthefollowingisnotthefunctionofIMS?().AAutomaticrepairequipmentandsoftwarefailure.BMakeearlywarningandsuggestionsforrisks.CAnalyzeandpositionthecausesandsourcesofrisks.DPerceiveandpredictequipmenthealthandbusinessoperation.第6题Intheactualproductionprocess,rationalapplicationofintelligentpredictioncanreduceresourceloss.Isthisstatementcorrect?（）ACorrectBWrong第7题"Themeasureoftheabilityofanitemtoberetainedinorrestoredtospecifiedconditionwhenmaintenanceisperformedbypersonnelhavingspecifiedskilllevels,usingprescribedproceduresandresources,ateachprescribedlevelofmaintenanceandrepair"isthedefinitionofwhichofthefollowing?AAvailabilityBMaintainabilityCReliabilityDNoneoftheabove第8题Thebesttimetoworkonreducingcorrectivemaintenancetimeis:Aimmediatelyafterafailureoccurs.Bassoonastheequipmentisdelivered.Cassoonasfinaldesignorfinalprototypesareavailable.Dduringtheequipmentdesignphase.第9题Intheactivitynetworkdiagram(AND),ifanarrowpointsfromactivityYtoactivityXAactivityXmustbecompletedbeforeactivityYisbegunBactivityYcostsmorethanactivityXCbothactivitieslieonthecriticalpathDactivityYmustbecompletedbeforeactivityXisstarted第10题Thecorrectstatementabouttheproductreliabilityguaranteeprogramis().ATheformulationofthereliabilityassuranceprogramisaveryimportanttaskinreliabilitymanagement.Reliabilityengineersshouldbefamiliarwithandmasterthebasicmethodsandrequirementsforformulatingtheprogram.BForanyproduct,32workitemsmustbeincludedintheReliabilityAssuranceProgramCForanyproduct,thereliabilitygu