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

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

1
Seat No.: ________ Enrolment No.___________

GUJARAT TECHNOLOGICAL UNIVERSITY

BE - SEMESTER ?VIII(NEW) EXAMINATION ? SUMMER 2019
Subject Code:2182407 Date:17/05/2019

Subject Name:Switch Gear & Protection

Time:10:30 AM TO 01:00 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) Draw the schematic diagram of single phase sub-station. 03
(b) Explain trip circuit and its operation with necessary diagrams. 04
(c) Define RRRV. Derive the equation for RRRVmax. 07
Q.2 (a) Define fault condition and types of abnormal condition. 03
(b) Give advantages of SF6 circuit breaker. 04
(c) Explain current chopping with relevant diagram. 07
OR
(c) Draw and explain Air Break circuit breaker. 07
Q.3 (a) Explain the following term: (i) Switch-gear, (ii) Lightning arrester
and (iii) Earthing switch
03
(b) Compare Static versus Electromagnetic relays. 04
(c) Explain Percentage Differential Protection of Transformer with
necessary diagrams.
07
OR
Q.3 (a) Explain characteristics of over current protection relays. 03
(b) Compare Induction Disc and Induction Cup relays in tabular form. 04
(c) Explain the construction and working principle of Buchholz relay. 07

Q.4 (a) Compare Vaccum circuit breaker and Oil circuit breaker in brief. 03
(b) Explain Inter-turn fault protection scheme for generator. 04
(c) Write a short note on Directional relay. 07

OR
Q.4 (a) Explain microprocessor based relay in brief. 03
(b) Explain the protection of generator against stator and rotor faults. 04
(c) Explain Distance relay with its different characteristics. 07
Q.5 (a) Explain Translay relay in brief. 03
(b) Explain attracted armature relay. 04
(c) Explain the construction and working principle of Zinc Oxide
lightning arrester.
07
OR

Q.5 (a) Give difference between bushing and isolator. 03
(b) What is the need of Neutral grounding? Explain any one method of
Neutral Grounding.
04
(c) Explain the carrier current based transmission line protection scheme
with block diagram.

07
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