大家一起来做可靠性考试试卷！！

cliffcrag

ASQ的一个关于可靠性考试的几个题目：

1.Whichofthefollowingmethodswillmostimprovethereliabilityofaproduct?
(A)Reducingconfidencelevels
(B)Reducingvariation
(C)Increasingsamplesize
(D)Increasingtesttime

2.Whichofthefollowingmethodscanbeusedtoquantitativelyidentifyitemsthatarerisk-critical?
(A)Designreview
(B)Fault-treeanalysis
(C)Concurrentengineering
(D)Humanreliabilityanalysis
3.Atthedesignstageofaproduct,thefirstsafetyfocusshouldbeonwhichofthefollowing?
(A)Regulatoryrequirements
(B)Productiontools
(C)Controlsandequipment
(D)End-userapplications
4.Whichofthefollowingstatementsistrueaboutresponsesurfacemethods?
(A)Theycaneliminateday-to-dayvariationsinamanufacturingenvironment.
(B)Theyaremoreefficientthantwo-levelfactorialdesigntechniques.
(C)Theydonotrequiretechnicalconsiderationstoimplementthemethod.
(D)Theydeterminehowanoutputisaffectedbyasetofvariablesoveraspecifiedregion.
5.Whichofthefollowingassumptionsistrueaboutdegradation?
(A)Itisinherentandirreversible.
(B)Itisinherentandreversible.
(C)Itisunacceptableandirreversible.
(D)Itisunacceptableandreversible.
6.Aparts-countreliabilitypredictioniscalculatedbysummingonlythe
(A)partsfailurerates
(B)numberofpartsinthesystem
(C)variancesofthepartfailurerates
(D)partsfailurerateswithapplicationstress
7.Aparthasaconstanthazardrate.Ifpreventivemaintenanceisused,thepart’sfailureprobabilitywillbeaffectedinwhichofthefollowingways?
(A)Itwillincrease.
(B)Itwilldecreasetoafixedvaluegreaterthanzero.
(C)Itwilldecreasetozero.
(D)Itwillremainthesame.
8.Theuseofexperimentaldesigntechniquesearlyintheprocessdevelopmentstagegenerallyresultsin
(A)increasedpersonnelandproductcosts
(B)increasedproductdevelopmenttime
(C)decreasedvariabilityaroundtargetrequirements
(D)decreasedstart-upprocessyields

9.Aqualificationtestisplannedtoestablishwhetheraunitmeetsrequiredminimummeantimebetweenfailures(MTBF).WhichofthefollowingtoolscanbeusedtoestimatethechancethattheunitwillpassthetestevenifitstrueMTBFisbelowtherequiredlevel?
(A)Operatingcharacteristiccurve
(B)Blockdiagram
(C)Faulttree
(D)Transitionstatematrix
10.Thereliabilityblockdiagramofasystemisshowninthefollowingfigurewithcomponentreliabilitynotedineachblock.
--.70----.80---
---.90--
------
---.70-----.80--
即为（07与0.8串,两个再相并,再与0.9相串联)可靠性方框图RBD的一些知识
Whatisthereliabilityofthesystem?
(A)0.670
(B)0.726
(C)0.804
(D)0.820



Questions11-13refertothefollowinginformation.
Areliabilityengineerneedstouseanacceleratedtestplantoselectanewmaterial.Thefailuremodesareknowntobetemperature-related.

11.Whichofthefollowingstress-relatedcharacteristicsshouldbeconsideredbythereliabilityengineerduringthematerialselectionstage?
(A)Activationenergy
(B)Flexuralenergy
(C)Tensilestrength
(D)Compressionstrength
12.Whichofthefollowingtesttechniqueswouldallowthereliabilityengineertoevaluatethematerialquickly?
(A)Ambienttemperaturetest
(B)Step-stresstest
(C)Fullsystemtest
(D)Durabilitytest
13.Whichofthefollowingapproachesshouldbeusedforafieldvalidationtestofthenewmaterial?
(A)Implementthematerialchangeandmonitorfieldperformance.
(B)Fieldtestasampleofonlythenewmaterialinthesystem.
(C)Fieldtestsamplesofbotholdandnewmaterialinthesystem.
(D)Runlabtestsontwosystems.



14.Whichofthefollowingstatementsbestdescribesthesetofallvaluesofarandomvariable?
(A)Itisfinite.
(B)Itisaninterval.
(C)Itcanbediscreteorcontinuous.
(D)Itcanbetrackedbyusingcontrolchartsorscatterplots.
15.Whichofthefollowingisthebestdescriptionofrandomization?
(A)Atechniqueusedtoincreasetheprecisionofanexperiment
(B)Ameansofassuringrepresentativesampling
(C)Therepetitionofanobservationormeasurement
(D)Therelationshipbetweentwoormorevariables
16.Thehazardratefunctionforadeviceisgivenby

0.001ift<=10hours
and0.010ift>10hours
Whatisthereliabilityofthisdeviceat12hours?
(A)0.970
(B)0.980
(C)0.988
(D)0.990
17.Faultisolationisbestfacilitatedbyusing
(A)troublereports,correctiveactionreports,andinspectiondata
(B)interchangeability,redundancy,andcorrectivemaintenance
(C)preventivemaintenance,built-intestequipment,anddesignsimplification
(D)periodicconditioninspectionsandcorrectionofdetecteddeterioration
18.Tobemostcost-effective,acorrectiveactionshouldbeimplementedbetweenwhichofthefollowingevents?
AfterBefore
(A)InitialbuildFinalqualificationtest
(B)FinalqualificationtestInitialproduction
(C)InitialproductionFieldrelease
(D)FieldreleaseFieldupgrades
19.Inthemodely=12.1x1+5.3x2+ε,thex1followsaWeibulldistributionwithashapeparameterof3.5anda
characteristiclifeof20;x2followsalognormaldistributionwithameanof16andastandarddeviation(σ)of2.5;andεisarandomvariablewithameanof0andaσof1.Inthissituation,whichofthefollowingmethodswouldbebesttoevaluatethedistributionofy?
(A)Regressionanalysis
(B)MonteCarlosimulation
(C)Analysisofvariance
(D)Numericalintegral
20.Forlargepopulations,thesamplesizefortestingahypothesisdependsonallofthefollowingEXCEPTthe
(A)decisionrisksrequired(alphaandbeta)
(B)populationsize
(C)sizeofthesmallestdifferenceofinterest
(D)variationincharacteristicbeingmeasured
21.Acertainelectroniccomponenthasaconstantfailurerateof4*10e-7/hour.Asystemrequirestheuseof64unitsof
thiscomponent,andallofthecomponentsmustfunctionforthesystemtowork.Whatisthesystemfailurerate?
(A)2.56*10-5/hour
(B)3.91*10e-5/hour
(C)2.56*10e4hours
(D)3.91*10e4hours

22.Whentheorderofitemsisnotimportant,whichofthefollowingisthemethodtousetodeterminethenumberofsetsandsubsetsofitems?
(A)Combination
(B)Permutation
(C)Factorization
(D)Simulation
23.Asystemhasfourcomponentsinserieswithmeantimebetweenfailures(MTBF)of5,000,6,000,4,500and2,000
hours,respectively.Whatisthe200-hoursystemreliability?
(A)0.804
(B)0.832
(C)0.898
(D)0.989
24.Onehundredunitsaresubjectedtoareliabilitytestwithduration500clockhours.Duringthetest,2failuresoccur,atT1=110hoursandatT2=300hours.Thefailedunitsarenotreplaced.Onthebasisofthissample,theone-sided95%lowerconfidencelimitofreliabilityoftheseunitsforamissionof600hoursis
(A)0.858
(B)0.926
(C)0.976
(D)0.988
25.Afaircoinistossed10times.Whataretheexpectedmeanandvarianceofthenumberofheads?
MeanVariance
(A)0.50.025
(B)5.02.500
(C)5.05.000
(D)10.05.000

26--75见附件:cre_sample_exam3.rar


全文共有75个题目，大家都来做一做，做出来的话，请写一写你做哪题的详细过程。

我们一起来，检查一下，看自己对可靠性到底有多了解！！！

其余几个试题:
fanweipin可靠度工程師(CertifiedReliabilityEngineer，CRE)考試辦法.pdf(41KB)(下载后,将PDF改为DOC后缀)原文地址>>

robert928
美国可靠性工程师试题集.rar美国可靠性工程师认证考试试题翻译(中文版）

pzw4321

分享了！都是英文难倒我了～

hukee

强，请提供完整的文档下载，同时请admin用html出个在线考试。

naalee

挑两个简单的做一下：

第三题：设计阶段，首要的关注安全方面应该是终端用户的应用！(D)End-userapplications

第十题：0.9*[1-(1-0.7*0.8)*(1-0.7*0.8)]=0.72576只有选B了

cliffcrag

我也选两个来做一下：

第23题：答案选（A）

计算公式已知MTBF求可靠度

MTBFTλR(t)F(t)
50002002000.9607894390.039210561
6000200166.670.96721610.0327839
4500200222.220.9565287390.043471261
20002005000.9048374180.095162582

串联可靠度为:0.804304156
并联可靠度为:0.999994682
大概介绍一下里面计算的公式：
λ=1/MTBFR(t)=EXP((-1/MTBF)*T)F(t)=1-R(t)
串联可靠度=4个R(t)相乘


第24题：选（B）
计算方法：
详细参考MIL-HDBK-338BP575定时截尾试验方案
8.3.2.5.2ConfidenceLimits-ExponentialDistribution
已知参数:n=100
t*=500
故障时间是:1103000
置信水平:0.95
解:r=2
a=0.05
2r=4
T=52110

MTBF=8276.954921

MTBFTλR(t)F(t)
8276600120.83131950.930066870.06993313

R(t)=0.93答案B最接近

很久很久以前做了个EXCEL表。把可靠性的一些相关计算输入了进去，找个时间上传上来给大家看看

楼下计算做题目，参加考试。。做的好有赠送积分，积分可是有用的哦，可以用来下载好的标准！！

[本帖最后由cliffcrag于2007-6-114:18编辑]

imm

不错，做完这些题目，可以将可靠性的知识面归纳总结一下了。

molly.tian

第一次看到可靠性测试还有试题。值得学习。

ntust

我也來試看看

cc20061212

第一题我觉得选B，A.C.D都不能改变产品的固有可靠性

cc20061212

第二题B

cc20061212

5A