GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER-V (OLD) EXAMINATION - WINTER 2018
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Subject Code:150905 Date: 27/11/2018
Subject Name: Switchgear
Time: 10:30 AM TO 01:00 PM Total Marks: 70
Instructions:
- Attempt all questions.
- Make suitable assumptions wherever necessary.
- Figures to the right indicate full marks.
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Q.1 (a) Explain High resistance method to extinguish arc. 07
(b) How Arc is initiated and maintained between CB contacts? 07
Q.2 (a) Write a short note on “Current Chopping”. 07
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(b) Compare minimum oil circuit breaker with Bulk oil CB. 07
OR
(b) Discuss the duties of circuit breaker. 07
Q.3 (a) Explain any one method for power factor correction. 07
(b) With neat diagram explain the working of Air Blast circuit breaker. 07
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OR
Q.3 (a) Discuss various types of circuit breaker in brief. 07
(b) Differentiate between Circuit breaker, Fuse and Isolator. 07
Q.4 (a) Compare Direct and Indirect testing of Circuit Breaker. 07
(b) Discuss Slepian’s for arc interruption in circuit breaker. 07
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OR
Q.4 (a) Describe the construction, operating principle and applications of Vacuum Circuit Breaker. 07
What do you mean by Rated Breaking capacity and Rated Making capacity of circuit breaker? 07
Q.5 (a) Enlist and explain in brief, “The equipment used in Testing Station”. 07
(b) Differentiate between Routine test and Type test. 07
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OR
Q.5 (a) Discuss the properties of SF6 gas. 07
(b) Explain any one testing arrangement for circuit breaker, with neat diagram. 07
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