EMP5103 Midterm Exam 1999
1. Develop an expression for mean time to failure (MTTF) of a series system with
independent and non-identical units. Assume that each unit failure times are
Assume k elements in the series system.
EMP5103 Midterm 2006 - Thursday, March 2, 2006
Denotes an output event occurs if
and only if all the input events occur.
1. (a) Describe 4 elements found in the fault tree process.
Denotes an event which
results from the combination
of fault events throug
Purposes of Collecting Failure Data
To calculate hazard rate (failure rate) of an item.
To make decisions regarding the introduction of a redundant item.
To perform trade-off studies (cost-reliability studies).
To conduct the items replacement studies.
0 P ( X ) 1
P ( X 1 X 2 X 3 . X n ) P ( X 1 ) P ( X 2 ) P ( X 3 ) . P ( X n ) (mutually exclusive events)
P ( X 1 X 2 X 3 . X n ) 1 1 P ( X i ) (independent events)
P ( S ) 1
P ( S ) 0
P ( X 1 X 2 X 3 X n ) P
MCG 5171: Course Outline
Reliability background and introductory mathematics.
Failure data collection and Sources
Static Reliability Evaluation Models