JE – 1083

*JE1083*

II Semester M.E. (P.E.) Degree Examination, July/August 2013 (2K8 Scheme) 2K8 PEL 24 : Elective – I : RELIABILITY ENGG. Time : 3 Hours

Max. Marks : 100

Instruction : Answer any five full questions. 1. a) What are the basic steps to be followed to determine system reliability ?

10

b) Derive an expression for MTTF in constant hazard model and linear hazard model.

10

2. a) Explain the reliability estimation technique for series connected system and derive the expression for system reliability and MTTF.

10

b) For the system represented in Fig. 2(b). Calculate the reliability using tie-set and cut-set method. 10

Fig. 2(b) 3. a) What are the causes of electrostatic over stress and how it can be prevented ? b) What is maintainability and availability ? How these two are related to reliability ? 4. a) What are the different failure mechanisms in accelerated testing ? b) Explain the electronic packaging hierarchy with a suitable diagram. 5. Describe Markov models in detail.

10 10 10 10 20 P.T.O.

JE – 1083

-2-

*JE1083*

6. a) Explain dependent events and independent events with suitable examples. b) Explain the concept of element redundancy and unit redundancy. 7. Calculate the reliability factor of the system shown in Fig. Q. 7.

Fig. Q. 7

———————

10 10 20

Elective – I RELIABILITY ENGG.pdf

10. 7. Calculate the reliability factor of the system shown in Fig. Q. 7. 20. Fig. Q. 7. ———————. Page 2 of 2. Elective – I RELIABILITY ENGG.pdf. Elective – I ...

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