Download GTU (Gujarat Technological University) BE/BTech (Bachelor of Engineering / Bachelor of Technology) 2018 Winter 6th Sem New 2160904 High Voltage Engineering Previous Question Paper
1
Seat No.: ________ Enrolment No.___________
GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER ?VI (NEW) EXAMINATION ? WINTER 2018
Subject Code:2160904 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.
MARKS
Q.1 (a) State & Explain Paschen?s Law. 03
(b) Explain Finite Element Method. 04
(c) Define Townsend?s first and second ionization coefficients. Obtain
Current growth equation due to first and second ionization.
07
Q.2 (a) What is Thermal breakdown in solid dielectric. 03
(b) Discuss properties of good solid dielectric. 04
(c) Explain Purification and Breakdown tests for liquid Dielectric. 07
OR
(c) What is Electric stress? Explain Electric field stress in homogeneous isotropic
materials.
07
Q.3 (a) Draw & explain characteristics of Lightning Impulse Voltage wave. 03
(b) What is difference between Marx circuit and modified Marx circuit. 04
(c) An impulse generator has eight stages with each condenser rated for 0.16 ?F and
125 KV. The load capacitor available is 1000 pF. Find the series resistance and
the damping resistance needed to produce 1.2/50 ?s impulse wave. What is the
maximum output voltage of the generator, if the charging voltage is 120 KV ?
07
OR
Q.3 (a) List out different techniques to measure high voltages. 03
(b) What is the principle of operation of resonant transformer? List out advantages
and disadvantages of it.
04
(c) Explain capacitance voltage Transformer with its schematic representation,
Equivalent circuit and its phasor diagram.
07
Q.4 (a) Explain principle of Electrostatic voltmeter and limitation of it for high voltage
measurement.
03
(b) List out the Difference between Uniform field and Non-uniform field. 04
(c) What is meant by insulation co-ordination ? How are the protective devices
chosen for optimal insulation level in a power system?
07
OR
Q.4 (a) Discuss Rod Gap Arrester. 03
(b) Discuss Digital PD instrument. 04
(c) Discuss measurement of Dielectric constant and loss tangent of capacitor. 07
Q.5 (a) Draw & Discuss Equivalent circuit of partial discharge. 03
(b) Explain High ohmic series Resistance with Micro-ammeter with its advantages
and disadvantages for High Voltage DC measurement.
04
(c) Explain high voltage Testing on Insulators. 07
OR
www.FirstRanker.com www.FirstRanker.com
www.FirstRanker.com
FirstRanker.com - FirstRanker's Choice
www.FirstRanker.com
1
Seat No.: ________ Enrolment No.___________
GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER ?VI (NEW) EXAMINATION ? WINTER 2018
Subject Code:2160904 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.
MARKS
Q.1 (a) State & Explain Paschen?s Law. 03
(b) Explain Finite Element Method. 04
(c) Define Townsend?s first and second ionization coefficients. Obtain
Current growth equation due to first and second ionization.
07
Q.2 (a) What is Thermal breakdown in solid dielectric. 03
(b) Discuss properties of good solid dielectric. 04
(c) Explain Purification and Breakdown tests for liquid Dielectric. 07
OR
(c) What is Electric stress? Explain Electric field stress in homogeneous isotropic
materials.
07
Q.3 (a) Draw & explain characteristics of Lightning Impulse Voltage wave. 03
(b) What is difference between Marx circuit and modified Marx circuit. 04
(c) An impulse generator has eight stages with each condenser rated for 0.16 ?F and
125 KV. The load capacitor available is 1000 pF. Find the series resistance and
the damping resistance needed to produce 1.2/50 ?s impulse wave. What is the
maximum output voltage of the generator, if the charging voltage is 120 KV ?
07
OR
Q.3 (a) List out different techniques to measure high voltages. 03
(b) What is the principle of operation of resonant transformer? List out advantages
and disadvantages of it.
04
(c) Explain capacitance voltage Transformer with its schematic representation,
Equivalent circuit and its phasor diagram.
07
Q.4 (a) Explain principle of Electrostatic voltmeter and limitation of it for high voltage
measurement.
03
(b) List out the Difference between Uniform field and Non-uniform field. 04
(c) What is meant by insulation co-ordination ? How are the protective devices
chosen for optimal insulation level in a power system?
07
OR
Q.4 (a) Discuss Rod Gap Arrester. 03
(b) Discuss Digital PD instrument. 04
(c) Discuss measurement of Dielectric constant and loss tangent of capacitor. 07
Q.5 (a) Draw & Discuss Equivalent circuit of partial discharge. 03
(b) Explain High ohmic series Resistance with Micro-ammeter with its advantages
and disadvantages for High Voltage DC measurement.
04
(c) Explain high voltage Testing on Insulators. 07
OR
www.FirstRanker.com www.FirstRanker.com
www.FirstRanker.com
www.FirstRanker.com
2
Q.5 (a) What is a Tesla coil? How are damped high-frequency oscillations obtained from
Tesla coil ?
03
(b) Give the schematic arrangement of an impulse potential divider with an
oscilloscope connected for measuring impulse voltages.
04
(c) Explain Classification of High Voltage Laboratories. 07
*************
www.FirstRanker.com www.FirstRanker.com
www.FirstRanker.com
FirstRanker.com - FirstRanker's Choice
This post was last modified on 20 February 2020