Download GTU BE/B.Tech 2018 Winter 6th Sem Old 160904 High Voltage Engineering Question Paper

Download GTU (Gujarat Technological University) BE/BTech (Bachelor of Engineering / Bachelor of Technology) 2018 Winter 6th Sem Old 160904 High Voltage Engineering Previous Question Paper

www.FirstRanker.com
1
Seat No.: ________ Enrolment No.___________

GUJARAT TECHNOLOGICAL UNIVERSITY

BE - SEMESTER ?VI (OLD) EXAMINATION ? WINTER 2018
Subject Code: 160904 Date: 30/11/2018

Subject Name: High Voltage Engineering

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) What is treeing and tracking? Explain in concern with solid breakdown. 07
(b) Draw layout of typical high voltage laboratory. Enlist equipments with typical
specifications.
07

Q.2 (a) Explain high voltage schering bridge for measurement of capacitance and tan ?
of insulators.
07
(b) Enlist methods of controlled tripping of impulse generator. Explain any one
method in detail.
07
OR
(b) Explain with neat diagram the principle of operation of a Generating Voltmeter.
Discuss its advantages and limitations for high voltage measurements.
07

Q.3 (a) What is CVT? Explain with phasor diagram how a tuned CVT can be used for
voltage measurements in power system.
07
(b) Explain how a sphere gap can be used to measure impulse voltage? What are the
parameters and factors that influence such measurements?
07
OR
Q.3 (a) Explain charge simulation method for solving field problems and estimation of
potential distribution.
07
(b) Explain various theories of breakdown in commercial liquid dielectrics. 07

Q.4 (a)
Explain purification & breakdown tests for liquid dielectric or transformer oil.
07
(b) Explain the Streamer theory of breakdown in air at atmospheric pressure. 07
OR
Q.4 (a) Define and derive Townsend's first ionization coefficient. How is the condition
of breakdown obtained in a Townsend discharge?
07
(b) What is non-destructive testing of insulating materials? Give very briefly the
characteristics of these methods.
07

Q.5 (a) Explain insulation coordination. How protective devices are chosen for optimum
insulation level?
07
(b) Explain: Charge formation in clouds 07
OR
Q.5 (a) Explain the working of Cockcroft-Walton circuit with schematic diagram. 07
(b) Explain briefly the different electrical tests carried out on isolators and circuits
breakers.
07

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