Which of the following is the reason the bathtub curve has an increasing failure rate during the wear-out period?
Response:

• A.Design, materials and environment determine a limit of useful life.
• B.Probability of failure is related to external factors that increase over time.
• C.Design period does not project results past a predetermined time.
• D.System effectiveness decreases rapidly at this stage.

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The influence of FMEA on reliability is maximized at which of the following stages of development?
Response:

• A.Test.
• B.Design.
• C.Operation.
• D.Prototype.

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Which of the following statement is TRUE about environmental stress screening (ESS)?
Response:

• A.It is a form of accelerated testing.
• B.It stresses equipment beyond design limits
• C.It is used to validate a design.
• D.It involves random sampling

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Design review should be a process to ensure and/or develop more reliable design. Which of the following person(s), if any, should work with the designer during the design process?
Response:

• A.Reliability engineer.
• B.Management team.
• C.Designer only
• D.Design supervisor.

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A plastics plant operates 8 extruders producing plastic film. Production volume requirements cannot be met if less than 6 extruders are operating. There is a .30 probability that a machine stopping malfunction will occur.
What is the probability that 6 extruders can remain operating throughout the day?
Response:

• A.0.5783
• B.0.5518
• C.0.4482
• D.0.8059

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