An air handling system has a MTBF of 8000 hours, MTBMct of 120 hours, and MMT (mean maintenance action time) of 230 hours. Determine the potential availability.
Response:

• A.0.9575.
• B.0.9721.
• C.0.9852.
• D.0.9866.

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Which of the following techniques is NOT used when derating parts to enhance their overall reliability?
Response:

• A.Lower power dissipation.
• B.Use of 100% rating.
• C.Derating for temperature.
• D.Derating for stress.

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Which of the following statements is TRUE about probability distributions?
Response:

• A.The median is used to measure the central tendency
• B.The variance is used to measure the central tendency
• C.4th moment about the mean is used to measure the skewness
• D.The 3rd moment about the mean is used to measure the kurtosis

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When a bathtub curve is used, one characteristic of the flat center portion of the curve is that during this period Response:

• A.The equipment can be considered highly reliable.
• B.The reliability of the system can be expressed as an exponential function
• C.There can be only one type of failure in the system.
• D.The time of the next failure is predictable from the time of the last failure.

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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.0.9310
• B.0.9410
• C.0.9610
• D.0.9510

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