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Multiple Choice Quiz
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1.
A system is composed of three components. All three must function in order for the system to work. Each one has a reliability of .90. System reliability is:
A).729
B).900
C).990
D).999
E)2.700.
2.
A system is composed of three components, I, II, III. The reliabilities of the three components are respectively 0.50, 0.90, and 0.90. III is a standby for II that switches on only if II fails. The overall system reliability is:
A)2.300
B).405
C).495
D).860
E).540
3.
A machine can operate for an average of 99 hours before needing service. Service time averages one hour. The availability of the machine is:
A)1.00
B).99
C).98
D).97
E)none of these.
4.
If the MTBF increases and the expected repair time remains the same, availability will:
A)decrease
B)remain the same
C)increase
D)impossible to say
5.
Which of the following describes the negative exponential distribution as a model of service lives?
A)It requires the z statistic.
B)Reliability is the area to the left of the MTBF.
C)It is symmetrical.
D)Reliability is the area to the right of the MTBF.
E)It has an infinite area.





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