[Q118-Q133] Certification Training for CRE Exam Dumps Test Engine [2022]

Q118. Which of the following statement is TRUE about environmental stress screening (ESS)?
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Q119. A series system whose reliability at 5 hours is 0.80, has three components with these historical constant failure rates:
λ 1 = failure rate for component 1 = 0.04 failures/hour
λ 2 = failure rate for component 2 = 0.07 failures/hour
λ 3 = failure rate for component 3 = 0.01 failures/hour
Three of the four answers are the three component reliabilities at 5 hours. Which is incorrect?
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Q120. Pascal’s triangle presents a simple means of determining which of the various terms of the binomial expansion?
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Q121. The reliability goal for a complex system is 0.995. The predicted reliability for the system is 0.999 when one of the subsystems is functioning and 0.90 when that subsystem is not functioning. What is the minimum reliability for this subsystem to meet the system reliability goal?
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Q122. Using an extreme worst-case method of variability analysis, if the indicated performance characteristics values fall within specifications, the designer can be confident that:
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Q123. Which of the following is the main advantage of a step stress test?
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Q124. Failure data are analyzed and a proportion of items survive to the end of the test. Data on these types of samples are referred as:
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Q125. Product reliability concerns the relationship of product function to:
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Q126. Develop the fault tree analysis for a candy dispensing machine. There are two contributing subsystems, both of them must fail for the system to fail. The electronic release has Pf = 0.04 and the coil spring release has Pf = 0.06. What is the system’s probability of failure?

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Q127. Which of the following will provide the BEST information for determining the value of reliability activities?
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Q128. A field test may be considered satisfactory if:
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Q129. The two principal measures of failure during risk assessment are which of the following?
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Q130. In a life test of 4 batteries, failures were observed after 10, 30, and 40 hours. The 4th battery was tested
75 hours without failure, at which time the test was terminated.
What are the estimated Mean-Time-To-Failure (theta) and failure rate (lambda)?
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Q131. The failure rate for an IC chip is 0.0023 per hour of operation. Calculate the MTBF given that the failure rate is constant.
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Q132. In general, one should select the highest component parameter ratings feasible so that:
I. Failure rates may be minimized.
II. Probability of secondary failure is minimized.
III. Safety margins are offered against unforeseen transients.
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Q133. As the reliability engineer of a medium sized firm, you have developed a reliability test plan for the shop.
The shop manufactures products on a medium batch size basis. The batches range from 30 to 500 pieces per order. The test plan should include all of the following consideration EXCEPT Response: