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Test Paper - Reliability of Electronics Cmmunication -punjab technical university - master in technology - Electronics and Communication st semester, Study notes of Reliability of Electronics Communications

Failure Rate and Hazard Rate, MTTF and MTBF, ReliabilityandMaintainability, hazard rate and reliability, normal and weibull, maintainability of the system, optimum maintainability, redundancy, perfect and imperfect switching, MTTR, equipment, Bays Decompositionmethod of reliability evaluation, Reliability and Safety, Monte-Carlo method

Typology: Study notes

2010/2011

Uploaded on 10/02/2011

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RoliNoo 0"""'.""''''''''''
Total No. of Questions: 08]
.~.
[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.
pf2

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Download Test Paper - Reliability of Electronics Cmmunication -punjab technical university - master in technology - Electronics and Communication st semester and more Study notes Reliability of Electronics Communications in PDF only on Docsity!

RoliNoo 0"""'.""'''''''''' Total No. of Questions: 08] .~. [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.

Q4) (a) What is meant by redundancy? Differentiateclearly between component

redundancy and the system redundancy.

(b) Compute the reliabilityofa systemconsisting of componentsA,B,C;~E

having reliabilities '0.9; 0.7; 0.5; 0.8 and 0.8 respectively and arranged

as in the diagram.

Q5)

'l.-(\ o-A..

(a) Compare active and passive redundancy.. (b) Explain role of standby units with perfect and imperfect switching. (c) An air craft la~d on two engines though it has four. If each engine has a reliability of 0.95, find the probability of successfullanding..

Q6). (a) DefineAvailability,Intrinsicavailability,Inherentavailability;equipment

availabilityandoperational availability.

(b) A component has MTBF = 300 Hrs and MTTR = 15hrs. with both the

failure and repair distribution exponential. What is the availability at 10

Hrs, for first 10 hr and at steady state.

Q7)

Q8)

J -

(ti) Give any Non-destructive test for life testing of an equipment.

(b) What is process of measurement and prediction of human reliability.

(c) What is structure of value engineering. Give anyone technique for

value engineering. ' Write short notes on any two: (a) Bays Decompositionmethod of reliability evaluation. (b) Reliability and Safety. (c) Monte-Carlo method.