Which answer mathematically expresses the reliability of an active parallel system in which all component reliabilities are unequal?

Response:

• A.Rs = RaRbRc - (RaRb + RbRc + RaRc) + (Ra + Rb + Rc)
• B.Rs = [RaRbRc] / [Ra + Rb + Rc]
• C.Rs = Ra + Rb + Rc - RaRbRc
• D.Rs = [RaRbRc + RaRb + RbRc + RaRc ] / [Ra + Rb + Rc]

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What is the difference between a system whose reliability prediction is MTTF versus one whose reliability prediction is MTBF?
Response:

• A.MTBF implies that the system can't be repaired. MTTF implies that it can be.
• B.MTTF is used for maintainability studies. MTBF is used for reliability studies.
• C.There is no difference. Both terms mean essentially the same.
• D.MTTF implies that the system can't be repaired. MTBF implies that it can be.

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Concurrent engineering means
Response:

• A.Use of inputs from all technical disciplines early and simultaneously.
• B.Engineers working in tandem shifts to speed the process.
• C.An electrical engineering term.
• D.Alternate designs being generated in parallel.

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All of the following statements are TRUE about confidence interval EXCEPT Response:

• A.The width indicate the uncertainty in estimates.
• B.A smaller sample size would yield a larger width
• C.The width does not depend on the confidence level.
• D.A larger sample size would yield a smaller width

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A first step in the FMECA is to:
Response:

• A.Identify failure modes.
• B.Define the system requirements.
• C.Compile a critical items list.
• D.Establish ground rules to which the FMECA is performed.

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