Roll No.
Total No. of Pages : 02
Total No. of Questions : 08
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M.Tech.(ECE) (EL-I 2016 Batch) (Sem.-2)
RELIABILITY OF ELECTRONICS COMMUNICATION SYSTEMS
Subject Code : MTEC-204 C
M.Code : 74283
Time : 3 Hrs.
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Max. Marks : 100
INSTRUCTIONS TO CANDIDATES :
- Attempt any FIVE questions out of EIGHT questions.
- Each question carries TWENTY marks.
- a) Write in detail about replacement processes and policies.
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b) Explain different modes of failures and life characteristics curve of failure. - Explain various kinds of systems. Calculate the reliability of a system having :
a) Series components
b) Parallel components
c) Parallel series components - How a product is evolved? Explain product development cycles using value engineering approach.
- a) What are the various factors affecting human reliability. Explain different methods for predicting the same .
b) Explain the concept of safety margins in critical devices. What will be the effect of increasing safety margins? - a) What is the application of Weibill distribution?
b) Explain the tie set and cut set method for predicting reliability. - Explain the various terms using examples:
a) Down time
b) Up time ratio
c) Mean time between failures
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e) Availability
f) Confidence level
g) Mean life
h) Corrective maintenance down time
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j) Reliability - a) Elaborate various kind of testing methods for equipments
b) What do you mean by stand by system? Explain various stand by redundancy. - a) A car fleet owner finds from his past records the cost per year of running a car and its resale value as given below. The purchase of the car is Rs 25000. At what stage should the car be replaced?
Year of operation Resale price at the end of year Annual operating cost Annual maintenance cost 1 15000 6300 300 2 13500 7000 500 3 12000 7700 1000 4 9000 9500 1500 5 8000 11500 2500 6 7500 13000 3500 7 7000 14300 4500 --- Content provided by FirstRanker.com ---
b) Explain various types of maintenance with equation of maintainability.
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NOTE : Disclosure of Identity by writing Mobile No. or Making of passing request on any page of Answer Sheet will lead to UMC against the Student.
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