Download GTU BE/B.Tech 2019 Summer 5th Sem Old 150905 Switchgear Question Paper

Download GTU (Gujarat Technological University) BE/BTech (Bachelor of Engineering / Bachelor of Technology) 2019 Summer 5th Sem Old 150905 Switchgear Previous Question Paper

1
Seat No.: ________ Enrolment No.___________

GUJARAT TECHNOLOGICAL UNIVERSITY

BE - SEMESTER ? V(OLD) EXAMINATION ? SUMMER 2019
Subject Code:150905 Date:06/06/2019

Subject Name:Switchgear

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.

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
(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
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
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 :
(i) Problem associated with the interruption of Small inductive
currents
(ii) Effect of Power Factor on TRV.
07
(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

*************
FirstRanker.com - FirstRanker's Choice