Free ASQ CRE Exam Dumps Questions & Answers

The flat portion of the bathtub curve is a region of chance failures; therefore, for the reliability equation shown below:
Response:

• A.  Applies only to this region.
• B.  Applies to the wear out region as well as the flat region.
• C.  Applies to the entire bathtub curve.
• D.  Does not apply to this region.

When performing trade-offs in evaluating parts for reliability, which of the following is LEAST important?
Response:

• A.  Search of data part history to established reliability potential.
• B.  Technical comparison of new part with standard part type.
• C.  Initial parts costs.
• D.  Process and materials compatibility.

On the basis of the fault tree below, what is the likelihood of the top event occurring?

Response:

• A.  0.0050
• B.  0.5200
• C.  0.3000
• D.  0.2600

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

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

For a high compression aircraft air conditioning system, the MTBF is 100 hours. This mean life is allocated for four serial units comprising the total system. The unit failure rates are then weighted as follows:
w 1 = 0.1250 w 3 = 0.1875
w 2 = 0.2500 w 4 = 0.4375
Based upon the above data, indicate which of the following is the correct calculation for one of the units.
Response:

• A.  λ 2 = 0.0025100
• B.  λ 4 = 0.0435700
• C.  λ 3 = 0.0018750
• D.  λ 1 = 0.0125000