The main purpose of environmental stress screening is which of the following?
Response:

• A.To assist in the selection of standardized parts.
• B.To subject parts to extremes
• C.To eliminate supplier inspections.
• D.To eliminate infant mortality failures.

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A series system whose reliability at 5 hours is 0.80, has three components with these historical constant failure rates:
λ 1 = failure rate for component 1 = 0.04 failures/hour
λ 2 = failure rate for component 2 = 0.07 failures/hour
λ 3 = failure rate for component 3 = 0.01 failures/hour
Three of the four answers are the three component reliabilities at 5 hours. Which is incorrect?
Response:

• A.0.9123
• B.0.9816
• C.0.8780
• D.0.9283

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Which of the following is the GREATEST benefit of a fault-tree analysis?
Response:

• A.It is systematic and identifies ways to avoid failures.
• B.It is bottom-up and provides detailed accident scenario.
• C.It is easy to perform and does not require a computer program.
• D.It is comprehensive and readily converted to a computer program.

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In general, reliability testing is performed for which of the following reasons?
I. To detect unanticipated failure modes.
II. To compare estimated failure rates to actual failure rates.
III. To monitor reliability growth over time.
IV. To meet or exceed customer expectations.
Response:

• A.I and III only
• B.I, II, III and IV
• C.II and IV only
• D.I, II and III only

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High cycle fatigue would MOST likely result in
Response:

• A.Wear out failure.
• B.Constant failure.
• C.Early failure.
• D.Mid-life failure.

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