Download GTU BE/B.Tech 2019 Winter 8th Sem New 2182407 Switch Gear And Protection Question Paper

Download GTU (Gujarat Technological University) BE/BTech (Bachelor of Engineering / Bachelor of Technology) 2019 Winter 8th Sem New 2182407 Switch Gear And Protection Previous Question Paper

1
Seat No.: ________ Enrolment No.___________

GUJARAT TECHNOLOGICAL UNIVERSITY

BE - SEMESTER ? VIII (New) EXAMINATION ? WINTER 2019
Subject Code: 2182407 Date: 29/11/2019

Subject Name: Switch Gear & Protection
Time: 02:30 PM TO 05:00 PM Total Marks: 70

Instructions:
1. Attempt all questions.
2. Make suitable assumptions wherever necessary.
3. Figures to the right indicate full marks.
4. Assume suitable data if necessary.

MARKS

Q.1 (a) Explain basic principle of arc interruption with respect to circuit breaker. 03
(b) Discuss possible causes of short circuits and its effects. 04
(c) Describe working of Air Blast Circuit breaker with neat diagram.
Breakers
07

Q.2 (a) What is RRRV? Explain. 03
(b) Discuss function of Trip circuit. 04
(c) Explain working principle of SF6 circuit breaker with its diagram. 07
OR
(c) Write a brief note on Vacuum circuit breaker and compare its advantage over
oil circuit breaker.
07
Q.3 (a) Discuss basic principle of Distance relay. 03
(b) Explain characteristics of Over current protection relays in brief. 04
(c) Discuss about the construction and working principle of Differential relay. 07
OR
Q.3 (a) Explain Restriking voltage. 03
(b) Compare Induction disc and Induction cup type relays. 04
(c) Discuss about the protection of Bus bar in power system. 07
Q.4 (a) Explain current chopping. 03
(b) Discuss about rotor earth fault protection for generator. 04
(c) Explain the construction and working principle of Buchhoz relay. 07
OR
Q.4 (a) What are static relays? 03
(b) Write advantages and disadvantages of HRC fuse. 04
(c) Explain neutral grounding using reactor with its merits and demerits. 07
Q.5 (a) What is making current for circuit breaker? Explain. 03
(b) Compare static relay and electromagnetic relay in all respect. 04
(c) Explain Inter turn fault protection scheme for generator. 07
OR

Q.5 (a) Explain necessity of neutral grounding. 03
(b) Discuss single line to ground fault. 04
(c) Discuss about the construction and working principle of Zinc Oxide lightning
arrester.
07

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