Download GTU B.Tech 2020 Winter 6th Sem 2160904 High Voltage Engineering Question Paper

Download GTU (Gujarat Technological University Ahmedabad) B.Tech/BE (Bachelor of Technology/ Bachelor of Engineering) 2020 Winter 6th Sem 2160904 High Voltage Engineering Previous Question Paper

Seat No.: ________
Enrolment No.___________
GUJARAT TECHNOLOGICAL UNIVERSITY
BE- SEMESTER?VI (NEW) EXAMINATION ? WINTER 2020
Subject Code:2160904 Date:29/01/2021
Subject Name:High Voltage Engineering
Time:02:00 PM TO 04:00 PM Total Marks: 56
Instructions:
1. Attempt any FOUR questions out of EIGHT questions.

2. Make suitable assumptions wherever necessary.

3. Figures to the right indicate full marks.



MARKS
Q.1 (a) Explain time lags for breakdown of gas.
03

(b) Give comparison between uniform and non-uniform
04
Field.

(c) Explain Classification of High Voltage Laboratories.
07


Q.2 (a) Discuss how to measure ac voltage using sphere gap.
03

(b) Draw and explain Marx circuit and modified Marx
04
Circuit of multistage impulse generator.

(c) .Explain with neat diagram the principle & construction of
07
an electrostatic voltmeter.




Q.3 (a) Draw & Discuss Equivalent circuit of partial discharge.
03

(b) What is Thermal breakdown in solid dielectric?
04

(c) Explain capacitance voltage Transformer with its schematic
07
representation, Equivalent circuit and its phasor diagram




Q.4 (a) Discuss Rod Gap Arrester.
03

(b) Discuss properties of good solid dielectric.
04

(c) Define Townsend's first and second ionization coefficients.
07
Obtain Current growth equation due to first and second ionization.



Q.5 (a) Discuss Hall effect in Hall generator.
03

(b) Explain Trigatron gap.
04

(c) What is Paschen's Law? How do you account for the
07
minimum voltage for breakdown under a given `p x d'
Condition?



Q.6 (a) Explain breakdown test for Transformer oil.
03

(b) Explain Tesla coil with its circuit & Waveform.
04

(c) What is Finite Element Method? Brief it for solving the
07
field problems
Q.7 (a) Explain metal oxide lightning arrester.
03

(b) Discuss Digital PD instrument
04

(c) Discuss the different methods of measuring high D.C.
07
voltages. What are the limitations in each method?





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Q.8 (a) Discuss power frequency tests of insulator.
03
(b) List advantages, disadvantages and applications of Van
04
de Graff generator.
(c) What is meant by insulation co-ordination? How are the
07
protective devices chosen for optimal insulation level in a
power system?

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