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:

What is the minimum number of failure free trips that one must make in their car to be at least 95% confident it is 95% reliable?
Response:

For complex electronics systems, the major contributor to repair time is generally:
Response:

Failure data are analyzed and a proportion of items survive to the end of the test. Data on these types of samples are referred as:
Response:

What is this system's reliability at 700 hours?
Component failure data is : - Failure rate of A = 0.0007 failures/hr - Reliability of B = 0.92 - MTTF of C =
1400 hours - Reliability of D = 0.85.

Response: