Lovely Professional UniversityRELIABILITY ENGINEERING

TEST-2 (ECE-436)Name: Roll No: Section: E2E62 Max. Marks = 30 Regd No: Time Duration:50 mins

1. a) Define maintainability and its role in reliability. [2.5] b) What are the steps in doing FMECA in safety analysis of a system? [2.5]2. Calculate the total reliability of two parallel systems each with three components in series. Assume the reliability of each component will be p. [10]3. Define and explain the Markov’s graph for availability of single element system. and NV = 1 ×1019 cm-3. [5]4. A microwave transmitter has exhibited a constant failure rate of 0.00034 failures per operating hour, which gives non- acceptable design life(0.95 reliability) of 150 hours. A second redundant transmitter is added (parallel). What is the design life of the new system? What will failure rate and hazard rate function of this redundant system. [10]

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Lovely Professional UniversityRELIABILITY ENGINEERING

TEST-2 (ECE-436)Name: Roll No:Section: E2E62 Max. Marks = 30 Regd No: Time Duration:50 mins

1. a) Define FMECA. What are the uses of FMECA. [2.5]. b) Define availability and its types. [2.5]2. Calculate the failure rate of a system for 10 i.i.d components in series each with probability of failure of 0.93. Also calculate the MTTF and failure density. [10]3. Define MTBF and MTTR. A component has MTBF = 200 hour and MTTR = 10 hour with both the failure and repair distribution exponential, what is the availability at 10 hour, for first 10 hour and at steady state. [5]4. What is meant by redundancy? Differentiate clearly between the component redundancy and the system redundancy.. [10]

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A A

A B

Note: Attempt all the questions.

Note: Attempt all the questions.