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Total No. of Questions: 08]

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[Total No. of Pages: 02

M. Tech.

RELIABILITY OF ELECTRONICS AND COMMUNICATION SYSTEMS

SUBJECT CODE: EC -512 (Elective -I)

Paper ID : [E0571]

[Note: Please fill subject code and paper ID on OMR(

Time: 03 Hours

Instruction to Candidates:

1) Attempt any Five questions.

2) All questions carry equal marks.

Maximum Marks: 100

Ql) (a) Distinguish between the following:

(i) Failure Rate and Hazard Rate.

(ii) MTTF and MTBF.

(iii) ReliabilityandMaintainability. -

(b) Establish a relationship between hazard rate and reliability. A system

has a linearly increasing hazard rate z(t) = a + bt. Obtain its reliability

function.

Q2) -

(a) Discuss the importance of normal and weibull distribution in the field

of reliability engineering.

(b) The random variation with respect to time in the output voltage of an

electrical system are exponentially distributed with a mean value of

200Y. What is the probability that the output voltage at any time will lie

in the range of 180 to 200V.

Q3) (a) Give a concept of maintainability. How the inventory control of spares

effect the maintainability of the system.

(b) Explain Diagnostic instruments.

(c) List out the factors to be provided in the design of a system to achieve

optimum maintainability.

J-4161{8J29] P. T. O.