CRE Exam Questions
399 real CRE exam questions with expert-verified answers and explanations. Page 5 of 8.
- Question #214Data Collection and Use
What is the Z value needed to conduct a two tail test in a statistical inference problem, specifying 90% level of confidence?
z-valuehypothesis testingconfidence intervaltwo-tail test - Question #215Reliability in Design and Development
Derating enhance reliability in all of the following ways EXCEPT by
deratingcomponent stressdesign marginparameter variation - Question #216Reliability in Testing
Which of the following reliability tests is conducted during the prototype stage?
demonstration testprototype stagetesting phasesqualification test - Question #217Reliability in Testing
Which of the following graphs represents a product that is a good candidate for an accelerated degradation test involving overstress testing?
accelerated degradation testoverstress testingdegradation modelingreliability testing - Question #218Maintainability and Availability
It is often observed that unscheduled maintenance:
unscheduled maintenancecorrective maintenancefailure cause isolationmaintenance types - Question #219Life Cycle Reliability Engineering
Product safety standards do NOT include:
product safety standardssafety requirementsregulatory compliancesafety testing - Question #220System Reliability
What is the MOST vital information to know about a system in order to perform a hardware FMECA?
FMECAhardware analysisfailure mode analysissystem details - Question #221Reliability in Testing
The main purpose of environmental stress screening is which of the following?
environmental stress screeninginfant mortalityESSfailure elimination - Question #222Reliability in Design and Development
A standard parts program is likely to have which of the following positive and negative effects?
standard parts programparts standardizationdesign standardizationreliability program - Question #223System Reliability
A failure that leaves the system fully functional is:
failure classificationminor failuresystem functionalityfailure types - Question #224Data Collection and Use
Which one of the following quantitative methods does NOT apply to the assessment of actual system/component reliability?
reliability assessmentreliability allocationquantitative methodsfield data analysis - Question #225Life Cycle Reliability Engineering
The optimum cost point for total life cycle costs occurs:
life cycle costcost optimizationacquisition costoperations and maintenance cost - Question #226Maintainability and Availability
Preventive maintenance programs are MOST effective when
preventive maintenancehazard ratewear-outmaintenance effectiveness - Question #227Reliability in Design and Development
The margin of safety in a design is BEST described by which of the following statements?
margin of safetystress-strength analysisdesign marginload strength ratio - Question #228Reliability in Design and Development
Which of the following is an appropriate use for experimental design?
experimental designrobust designDOEdesign of experiments - Question #230System Reliability
In the bath curve model, which one of the sections represents the period when catastrophic failure are likely to occur?
bathtub curvefailure rate periodscatastrophic failurereliability lifecycle - Question #231Life Cycle Reliability Engineering
Which of the following is NOT a degradation mechanism?
degradation mechanismsfatiguewearderating - Question #232Leadership and Management
A Reliability Engineering Department is conducting a training needs assessment. Which of these techniques are used for a training needs assessment?
training needs assessmentorganizational developmentreliability departmenttraining techniques - Question #233Leadership and Management
When reliability people say they are breaking the monopoly of the designer they mean
design reviewinterdisciplinary reviewreliability engineer roleorganizational collaboration - Question #234System Reliability
For equipment consisting of three components connected in series whose respective reliabilities are 0.95, 0.94, 0.96, which could be used to calculate total probability?
series systemproduct rulereliability calculationprobability - Question #235Maintainability and Availability
In order to sustain a high system reliability in the field, it is BEST to:
preventive maintenancediagnostic checksfield reliabilitymaintenance scheduling - Question #236Life Cycle Reliability Engineering
A mission profile is:
mission profiletime-phasedoperating conditionsreliability planning - Question #237Data Collection and Use
The purpose of a failure reporting, analysis and corrective action system(FRACAS) includes which two of the following?
FRACASclosed-loop reportingcorrective actionfailure analysis - Question #238Data Collection and Use
Ideally for a FRACAS to be effective, how many failures should be allowed to pass before corrective action is to be undertaken?
FRACASfirst occurrencecorrective action thresholdfailure mode - Question #239Reliability in Design and Development
The following fault tree diagram was developed by a team. The probability are as follow: A1 = 0.90 B1 = 0.90 C1 = 0.80 A2 = 0.80 B3 = 0.80 C2 = 0.70 A4 = 0.70 The likelihood that t...
fault tree analysisprobability calculationAND/OR gatessystem failure probability - Question #240Reliability in Design and Development
One of the descriptions of component failures can be explained by a mathematical model with a formula showing that the rate of chemical reaction varies exponentially with a rise in...
Arrhenius lawtemperature effectschemical reaction ratefailure rate modeling - Question #241System Reliability
Which mathematical method provides a solution, has a time dimension and is solved numerically?
simulation modelnumerical solutiontime dimensionreliability modeling - Question #242Reliability in Design and Development
A fault tree analysis (FTA) is a design analysis technique constructed from a "top event". A basic problem with this technique in comparison to a FMECA would be which of the follow...
fault tree analysisFMECAtop eventdesign analysis comparison - Question #243Data Collection and Use
When a large number of components have been tested for a fixed time with no failure then:
zero-failure testingfailure rate estimationtime-terminated teststatistical inference - Question #244Data Collection and Use
Which of the following is TRUE about hypothesis testing?
hypothesis testingType I errorType II erroralpha risk - Question #245Reliability in Design and Development
The reliability of a complex system can BEST be improved by:
redundancysystem reliability improvementparallel designdesign strategy - Question #246System Reliability
A system has components connected in active parallel. At least n - 1 of the components must operate for the system to function properly. Suppose the time to failure of each compone...
active parallel systemMTTF formulaexponential distributionredundancy math - Question #247Reliability in Testing
Typical statistical distributions or confidence limits can be determined for accelerated tests. In the case of a step-stress test, the proper estimated distribution would be which...
step-stress testaccelerated testingfailure distributiontest validity - Question #248Reliability in Design and Development
Derating parts in specific applications is performed in order to:
deratingstress ratiofailure rate reductionpart selection - Question #249Leadership and Management
Feedback channels for the planning, management and assessment of product safety should include:
product safetyfeedback channelssafety managementofficial and unofficial sources - Question #250Life Cycle Reliability Engineering
Which of the following provides the maximum benefit of parts standardization?
parts standardizationlife cycle costpreferred parts listcost reduction - Question #251Maintainability and Availability
The primary reason for improving equipment accessibility is to:
equipment accessibilitydowntime minimizationmaintainability designserviceability - Question #253Reliability in Testing
The software test design method that involves seeding errors into a program is known is:
fault insertionsoftware testingerror seedingtest design methods - Question #254Data Collection and Use
The "least squares" description in regression analysis pertains to:
least squaresregression analysiscurve fittingdeviation minimization - Question #255Reliability in Design and Development
All of the following techniques are appropriate for reliability apportionment EXCEPT
reliability apportionmentAGREE allocationDuane modelweighted series - Question #257System Reliability
Root cause analysis provides a common sense approach to evaluating a problem. Align the following action steps in proper sequence from start to finish.
root cause analysiscorrective actionproblem solving processfailure analysis - Question #258Reliability in Design and Development
Eliminating hazards can be accomplished several ways. Which of the following does NOT eliminate a hazard?
hazard eliminationFMEAfault-tree analysiscontingency analysis - Question #259Data Collection and Use
The results of a designed experiment are to be analyzed using a chi-square test. There are five treatments under consideration and each treatment falls under two categories (succes...
chi-square testdegrees of freedomhypothesis testingstatistical analysis - Question #260System Reliability
Which one of the following would NOT be necessary in a corrective action status report?
corrective actionFRACASfailure reportingstatus reporting - Question #261Reliability in Design and Development
Reliability predictions can be used for all of the following purpose EXCEPT to
reliability predictiondesign comparisonlife-cycle costreliability improvement - Question #262System Reliability
Three identical subsystem are connected in an active parallel, non-load-sharing system. At least two of the tree must work in order for the system to work. The time to failure for...
parallel redundancyk-of-n systemexponential distributionsystem reliability - Question #263System Reliability
A certain equipment has a MTBF of m = 300 hours. Assuming an exponential distribution of time to failure, what is the maximum time of allowable operation if a reliability of 0.999...
MTBFexponential distributionreliability calculationmission time - Question #264Life Cycle Reliability Engineering
All of the following activities would be appropriate during the design and development stage of a product' life cycle EXCEPT:
product life cycledesign stagereliability growth testingreliability requirements - Question #265Data Collection and Use
A random sample of 100 bars of aluminum shows a tensile strength mean of 30,000 psi and a standard deviation of 3,000 psi. On the basis of this sample, what is the 95 percent confi...
confidence intervalstatistical inferencesamplingstandard deviation - Question #266System Reliability
A person takes their car to the repair shop and it stops doing what it was previously doing. This is an example of:
intermittent failurefailure modesfailure classificationdegradation failure