A company has produced a new module. The failure data on 40 returns are shown below.

If the time to failure follows a normal distribution, what is the probability that time to failure exceeds 20 hours ?
Response:

• A.0.028
• B.0.972
• C.0.950
• D.0.050

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Which of the following are important elements of the concept of risk?
Ⅰ. Damage
Ⅱ. Frequency
Ⅲ. Schedule
Response:

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

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Given mean-time-to-failure of 200 hours for each of two components, what is the probability of failure if both components operate in series for one hour?
Response:

• A.P = 0.010
• B.P = 0.001
• C.P = 0.990
• D.P = 0.002

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Combined environmental reliability testing allows for a:
Response:

• A.Use of a common acceleration factor for relative MTTF from its accelerated condition to its normal condition
• B.Range of test conditions in excess of design tolerances
• C.Multiple stress test
• D.Method for certification of test results.

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Which of the following can be used to determine the MTTR?
Response:

• A.Mean maintenance action time.
• B.Mean time between failures.
• C.Mean time between failures and potential availability.
• D.Mean time between maintenance actions.

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