GTU BE/B.Tech 2019 Winter Question Papers || Gujarat Technological University
Subject Code: 2182407
GUJARAT TECHNOLOGICAL UNIVERSITY
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BE - SEMESTER- VIII (New) EXAMINATION — WINTER 2019
Subject Name: Switch Gear & Protection
Date: 29/11/2019
Time: 02:30 PM TO 05:00 PM
Total Marks: 70
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Instructions:
- Attempt all questions.
- Make suitable assumptions wherever necessary.
- Figures to the right indicate full marks.
- Assume suitable data if necessary.
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| 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. | 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 | ||
| (c) Explain Restriking voltage. | 07 | |
| Q.4 | (a) Compare Induction disc and Induction cup type relays. | 03 |
| (b) Discuss about the protection of Bus bar in power system. | 04 | |
| (c) Explain current chopping. | 07 | |
| OR | ||
| (c) Discuss about rotor earth fault protection for generator. | 07 | |
| Q.5 | (a) Explain the construction and working principle of Buchholz relay. | 03 |
| (b) What are static relays? | 04 | |
| (c) Write advantages and disadvantages of HRC fuse. | 07 | |
| OR | ||
| (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 | ||
| (c) Explain necessity of neutral grounding. Discuss single line to ground fault. Discuss about the construction and working principle of Zinc Oxide lightning arrester. | 07 | |
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