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ASQ CRE Exam Syllabus Topics:

ASQ Certified Reliability Engineer (CRE) Sample Questions:

1. 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)?
Response:

A) Estimated MTTF = 14; Failure rate = .017
B) Estimated MTTF = 52; Failure rate = .019
C) Estimated MTTF = 27; Failure rate = .038
D) Estimated MTTF = .019; Failure rate = 52

2. A satellite has two redundant control systems, each has a failure rate (lambda) = 1×10 -6 failures/hour. If one of the systems fails, the failure rate for the remaining system increases to 2×10 -5 failures/hour.
What is the reliability of the redundant control systems at 175,000 hours?
Response:

A) 0.690
B) 0.7796
C) 0.2507
D) 0.8609

3. Which of the following is the BEST approach to recover product reliability from manufacturing?
Response:

A) Reduce product variability.
B) Reduce scheduled product maintenance.
C) Increase receiving inspection
D) Improve the suppler selection process.

4. All of the following statements are TRUE about confidence interval EXCEPT Response:

A) The width does not depend on the confidence level.
B) A smaller sample size would yield a larger width
C) The width indicate the uncertainty in estimates.
D) A larger sample size would yield a smaller width

5. In a system with a constant failure rate, the relationship between the failure rate and MTBF is that the failure rate is Response:

A) The inverse of the MTBF.
B) Directly proportional to the MTBF.
C) A linear function of the MTBF with a negative correlation coefficient.
D) A linear function of the MTBF with a positive correlation coefficient.

Solutions: