Q1.
(a)
(i)
Explain why reliability is important in system design.
(ii)
Describe what are the quantative measures of reliability.
(b)
Define the following terms:
(i)
Operational availability
(ii)
Inherent availability
(iii)
System effectiveness
(c)
A system consists of three subsystems in parallel. The individual
subsystem reliabilities are as follows:
Subsystem A = 0.98
Subsystem B = 0.85
Subsystem C = 0.88
Determine the overall system reliability.
(d)
(i)
Explain why maintainability is important in system design.
(ii)
Describe how the maintenance requirements can be determined.
(e)
Given the following data, calculate the achieved availability,
(i)
Mct ? 5
.
0 hours
(ii)
MTBM?
(iii)
M pt ? 0
.
2 hours
(iv)
MTBs = 1000 hours
Q2.
(a)
Describe the system requirements for a system being developed in
response to fulfill some anticipated function.
(b)
Explain how the reliability of a system depends on the reliability of its
component parts selection and application.
(c)
Describe the stress-strength characteristics and explain the steps which
should be accomplished for such an analysis to be undertaken.
Q3.
(a)
Describe the quantative measures of maintainability.
(b)
Corrective maintenance task times were observed as given in Table Q3.
(i)
Determine the range of observations
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