ASQ CRE : Certified Reliability Engineer (CRE)

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ASQ Certified Reliability Engineer (CRE) Sample Questions:

1. In the bath curve model, which one of the sections represents the period when catastrophic failure are likely to occur?
Response:

A) All periods.
B) Infant mortality
C) Wear out period.
D) Constant failure rate period.

2. Which of the following is best defined as the practice of using parallel components and subsystems?
Response:

A) Optimization
B) Reliability
C) Maintainability
D) Redundancy

3. 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) 20 hours
B) 0.02 hours
C) 0.2 hours
D) 2 hours

4. The following reliability block diagram shows components A, B, C, D and E with reliability Ra, Rb, Rc, Rd and Re, respectively. A or B are system entry points.

On the basis of this information, what is the reliability of the system?
Response:

A) [1 - (1 - Ra Rb)] Rc [1 - (1 - Rd Re)]
B) Ra Rb [1 - (1 - Rd) (1 - Re)] Rc (1 - Ra) Rb [1 - (1 - Rd) (1 - Re)]
C) Ra Rc [1 - (1 - Rd Re)] + (1 - Ra) Rb Rc [1 - (1 - Rd) (1 - Re)]
D) Ra Rc [1 - (1 - Rd) (1 - Re)] + (1 - Ra) Rb Rc [1 - (1 - Rd) (1 - Re)]

5. Which mathematical method provides a solution, has a time dimension and is solved numerically?
Response:

A) None of the above.
B) Strength and stress model.
C) Analytic solution.
D) Simulation model.

Solutions: