II Semester M.E. (Power Electronics) Degree Examination, January 2013 2K8 PEL 24 : Elective – I : RELIABILITY ENGINEERING Time : 3 Hours
Max. Marks : 100
Instruction : Answer any 5 full questions. 1. a) What is reliability ? Explain the bath-tub curve used to specify different failures in reliability engineering. b) Briefly explain the causes for failure of a system. 2. a) Explain the system reliability with the components connected in series. b) Calculate the system reliability for the units connected as shown in fig. Q. 2 (b).
10 10 10 10
Fig. Q. 2 (b) 3. a) For the block diagram shown in fig. Q. 3(a), write the minimal tie-sets, obtain the reliability of the system, assuming the elements to be independent. 10
Fig. Q. 3 (a) b) What are the basic steps to be followed to determine system reliability ?
10 P.T.O.
*EJM018*
EJM – 018
4. a) What is maintainability and availability ? How these two are related to reliability ?
10
b) What are the different failure mechanisms in accelerated testing ?
10
5. a) Explain the following measurements used in accelerated testing.
10
i) MTTR ii) Maximum time iii) Mean Time to Restore (M.T.R.) iv) Maintenance work hour per operating hour. b) Explain dependent events and independent events with suitable examples. 6. a) Explain the concept of element redundancy and unit redundancy.
10 10
b) In the life testing of 10 specimens of a minimixer, the time to failure for each specimen is recorded and the same is given in the table below. 10 Specimen No.
1
2
3
4
5
Time to failure in hrs.
805
810
815
820
825
6
7
8
9
10
832 842 856 875 900
7. What is hazard rate model ? Discuss different types of hazard models.
failures in reliability engineering. 10. b) Briefly explain the causes for failure of a system. 10. 2. a) Explain the system reliability with the components connected in ...
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