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ASQ Certified Reliability Engineer (CRE) Sample Questions:

1. A device has a MTBF of 400 hours. Assuming an exponential distribution of time to failure, what is the maximum time of allowable operation if a reliability of .995 is required?
Response:

A) 0.02 hours
B) 2 hours
C) 0.2 hours
D) 20 hours

2. 50 resisters from a lot of 75,000 were tested. The average was 3,306 ohms with a variance of 21,609 ohm 2 . From this information, we may conclude with 99% confidence, that at least 95% of this lot will have resistance values in the range of Response:

A) 2,865 - 3,747 ohms
B) 3,012 - 3,600 ohms
C) 2927 - 3,685 ohms
D) 2,846 - 3,766 ohms

3. Which of the following is a key element of an effective reliability growth program?
Response:

A) A field service support organization
B) A reliability prediction program.
C) Field generated engineering change orders.
D) A failure reporting analysis and corrective action system.

4. All of the following statements concerning statistical inference are true EXCEPT:
Response:

A) The confidence interval is a range of values which may include the true value of a population parameter.
B) Estimation is the process of analyzing a sample result in order to predict the value of the population parameter
C) The confidence interval is normally the statistical tolerance limits of the population parameter.
D) The point estimate is a single value used to estimate the population parameter.

5. 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?
Response:

A) 0.9816
B) 0.8780
C) 0.9283
D) 0.9123

Solutions: