Online Access Free CRE Practice Test

For a reliability plan to be most effective, the reliability tasks should be integrated with which of the following plan?
Response:

• A.Product sales.
• B.Product design and development.
• C.Reliability centered maintenance.
• D.Product distribution

A satellite has two redundant control systems, each has a failure rate (lambda) = 1×10 -6 failures/hour. If one of the systems fails, the failure rate for the remaining system increases to 2×10 -5 failures/hour.
What is the reliability of the redundant control systems at 175,000 hours?
Response:

• A.0.7796
• B.0.2507
• C.0.690
• D.0.8609

Develop the fault tree analysis for a candy dispensing machine. There are two contributing subsystems, both of them must fail for the system to fail. The electronic release has Pf = 0.04 and the coil spring release has Pf = 0.06. What is the system's probability of failure?

Response:

• A.0.0100
• B.0.0024
• C.0.0124
• D.0.0098

A "fail-safe" requirement means:
Response:

• A.The safety systems cannot fail.
• B.The system is safe from failure.
• C.The system has safety devices.
• D.The system will fall in a safe state.

Which of the following is NOT a degradation mechanism?
Response:

• A.Wear
• B.Crack
• C.Fatigue
• D.Derate