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ASQ Certified Reliability Engineer (CRE) Sample Questions:

1. A plastics plant operates 8 extruders producing plastic film. Production volume requirements cannot be met if less than 6 extruders are operating. There is a .30 probability that a machine stopping malfunction will occur.
What is the probability that 6 extruders can remain operating throughout the day?
Response:

A) 0.5783
B) 0.8059
C) 0.4482
D) 0.5518

2. Maintenance times on simple with straightforward repair will fit which of the following distributions?
Response:

A) Normal.
B) Lognormal.
C) Exponential.
D) Geometric.

3. What is this system's reliability at 3000 hours?
MTBFs for the components are :
A = 2500 hours B = 3700 hours C = 2000 hours D = 4000 hours.
Response:

A) 0.029
B) 0.047
C) 0.017
D) 0.014

4. The designer has certain tools for reliable design at his/her disposal. He/She can:
I. Simplify the design and minimize the number of parts without degrading performance.
II. Perform design reliability review by means of reliability analysis.
III. Apply component derating techniques.
IV. Reduce the elevated operating temperature of components.
Response:

A) II and IV only
B) I, II and III only
C) I, II, III and IV
D) I and III only

5. The variations which the normal distribution curve describes are due to:
Response:

A) Non assignable causes.
B) Catastrophic failure
C) Degradation failure.
D) Assignable causes

Solutions: