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Multiple Choice Quiz
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1
If a system is composed a single component, system reliability might still be less than the component's.
A)True
B)False
2
The probability that a system will function is equal to the sum of the probabilities of its components.
A)True
B)False
3
Reliability is typically related to a specified set of operating conditions.
A)True
B)False
4
Redundancy is product design is not often used because it tends to decrease reliability.
A)True
B)False
5
If a system is composed of a series of independent components, the reliability of the system cannot be greater than the reliability of the least reliable component.
A)True
B)False
6
If a system is composed of a series of independent components, each with a reliability of 95%, the reliability of the system will be 95%.
A)True
B)False
7
The term available refers to the availability of repair workers in the event of equipment failure.
A)True
B)False
8
A machine operates for an average of 9 hours between the need for service, which takes an average of 1 hour. The machine's availability is:
A)9 hours
B)8 hours
C).90
D)1/9
9
A system is made up of two components, each with probability of operating correctly of .60. The probability that the system will operate correctly is:
A).60
B).36
C).24
D).16
10
Adding a component to a system will affect reliability in this way:
A)It will increase.
B)It will decrease.
C)It will not change.
D)All are possible.
11
A system is composed of one part and a backup, each with a probability of correctly functioning of .60. The backup automatically kicks in (100%) chance) if the component fails. The probability of the system correctly functioning is:
A).84
B).60
C).36
D).24
12
Mean repair time (MRT) is directly relevant to which one of the following?
A)MTBF
B)Availability
C)System reliability
D)Redundancy





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