GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER- V(OLD) EXAMINATION - SUMMER 2019
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Subject Code: 150905 Date: 06/06/2019
Subject Name: Switchgear
Time: 02:30 PM TO 05:00 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) Discuss the energy balance theory of arc interruption in circuit breaker. [07]
(b) What is circuit breaker? Discuss the arc phenomenon in a circuit breaker. [07]
Q.2 (a) Describe in detail the ratings of a circuit breaker. [07]
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(b) Discuss the rate recovery theory of arc interruption in circuit breaker. [07]
OR
(b) Explain the construction, working principle, merits and demerits of Air Break Circuit Breakers. [07]
Q.3 (a) Explain the properties of SF6 gas in recent developments of Circuit Breaker. [07]
(b) Explain the D.C. circuit breakers. [07]
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OR
Q.3 (a) In what respect is a M.O.C.B an improvement over B.O.C.B. what are limitation of M.O.C.B. [07]
(b) Write a short note on HVDC circuit breaker. [07]
Q.4 (a) Write a short note on: Resistance switching in HV circuit breakers. [07]
(b) Explain current chopping in circuit breaker. [07]
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OR
Q.4 (a) Short Note on Vacuum Circuit Breaker. [07]
(b) Discuss the principle of arc extinction in an oil circuit breaker. Describe the phenomenon of pre- arcing. [07]
Q.5 (a) Describe the following: [07]
(1) Problem associated with the interruption of Small inductive currents
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(i1) Effect of Power Factor on TRV.
(b) What is the important of testing of Circuit Breaker? Describe direct testing method of a Circuit Breaker. [07]
OR
Q.5 (a) What are the main parts of equipment which are used for testing of circuit breaker in laboratory type testing station? [07]
(b) Draw a basic short circuit testing plant of circuit breaker. [07]
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This download link is referred from the post: GTU BE 2019 Summer Question Papers || Gujarat Technological University
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