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ASQ Certified Reliability Engineer (CRE) Sample Questions:

1. If the reliability goal for a 4 - hour mission is 0.9999 for a complex system, what system MTBF is required?
Response:

A) 10,000 hours.
B) 55 hours.
C) 40,000 hours.
D) 2,500 hours.

2. What is this system's reliability at 700 hours?
Component failure data is : - Failure rate of A = 0.0007 failures/hr - Reliability of B = 0.92 - MTTF of C =
1400 hours - Reliability of D = 0.85.

Response:

A) 0.952
B) 0.998
C) 0.986
D) 0.994

3. As the reliability engineer of a medium sized firm, you have developed a reliability test plan for the shop.
The shop manufactures products on a medium batch size basis. The batches range from 30 to 500 pieces per order. The test plan should include all of the following consideration EXCEPT Response:

A) Estimate MTBF values.
B) Inspect the majority of parts produced.
C) Provide a safe testing environment.
D) Discover every failure mode.

4. A go/no-go device is tested until it fails. If X is the number of tests to first failure with no wear out present, and the probability of success on each test is .99, then the probability that X is greater than 5 is:
Response:

A) 0.9510
B) 0.9610
C) 0.9410
D) 0.9310

5. 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) 0.017
C) 0.014
D) 0.047

Solutions: