Download GTU BE/B.Tech 2019 Winter 6th Sem Old 160904 High Voltage Engineering Question Paper

Download GTU (Gujarat Technological University) BE/BTech (Bachelor of Engineering / Bachelor of Technology) 2019 Winter 6th Sem Old 160904 High Voltage Engineering Previous Question Paper

1
Seat No.: ________ Enrolment No.___________

GUJARAT TECHNOLOGICAL UNIVERSITY

BE - SEMESTER ? VI (Old) EXAMINATION ? WINTER 2019
Subject Code: 160904 Date: 11/12/2019

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) Describe the working of a Van de Graff generator with a neat sketch. 07
(b) How electronegative gas is important in high voltage applications? Explain in
Detail with advantages.
07

Q.2 (a) Explain with neat diagram the principle of operation of an electrostatic
voltmeter. Discuss its advantages and limitations for high voltage measurement.
07
(b) What are Treeing and Tracking? Explain clearly the two processes in solid
dielectrics.
07
OR
(b) Explain Corona discharge. 07

Q.3 (a) Explain test facilities and testing equipment?s in high voltage Laboratories. 07
(b) Explain the partial discharge tests for high voltage cables. How fault is located? 07
OR
Q.3 (a) Mention various types of lightning arrestors and write a comprehensive note on
Metal oxide arrestors.
07
(b) Define and explain the following terms with necessary figure:
i) Statistical time lag ii) formative time lag iii) total time lag.
07

Q.4 (a) What is Partial discharge of solid insulating material? Explain in detail. 07
(b) Describe various factors influencing breakdown in gas. 07
OR
Q.4 (a) Discuss High voltage Schering Bridge. 07
(b) How a sphere gap can be used to measure high voltage? Explain the factor
affecting such measurement.
07

Q.5 (a) Explain impulse testing of transformers with neat sketch. 07
(b) Discuss measurement of dielectric constant and loss tangent of capacitor. 07
OR

Q.5 (a) Short Notes on Paschan?s law for gaseous insulating medium 07
(b) Explain various theories for breakdown in commercial liquids. 07

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