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ASQ Certified Reliability Engineer (CRE) Sample Questions:

1. 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 the system fault will occur is
Response:

A) 0.3686
B) 0.3073
C) 0.4977
D) 0.5034

2. A prototype lot of a new design suspension spring underwent testing with these results:
- Total hours accumulated: 12,000
- Number of Failures: 6
- Hours to failure: 202, 387, 461, 590, 723, 864
What is the failure rate?
Response:

A) 0.0005/hour
B) 0.0024/hour
C) 0.0020/hour
D) 0.0018/hour

3. In general, consumer consider reliability and safety to be a
Response:

A) Characteristics of product quality.
B) Means of reducing product liability.
C) Means of reducing product cost.
D) Characteristics of product technology.

4. What type of failure is usually reduced by periodic overhaul and replacement of component parts?
Response:

A) Wear out.
B) Random.
C) Catastrophic.
D) Early life.

5. 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) Ra Rc [1 - (1 - Rd) (1 - Re)] + (1 - Ra) Rb Rc [1 - (1 - Rd) (1 - 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) [1 - (1 - Ra Rb)] Rc [1 - (1 - Rd Re)]

Solutions: