F 06000EE369122001 Pages: 2
Reg No.: Name:
APJ ABDUL KALAM TECHNOLOGICAL UNIVERSITY
Fifth Semester B.Tech Degree Regular and Supplementary Examination December 2020

Course Code:EE369
Course Name: HIGH VOLTAGE ENGINEERING
Max. Marks: 100 Duration: 3 Hours
PARTA

Answer all questions, each carries 5 marks. Marks

1 Describe with a neat diagram, the working of a simple voltage doubler circuit (5)
and its waveforms.

2 Draw the circuit diagram and mention advantages of resonant transformers (5)

used in high voltage AC generation.

Define impulse voltage? Draw a standard impulse wave form. (5)
4 Explain two methods of measuring impulse current. (5)
5 Explain the following terms: i) Withstand voltage ii) Flashover voltage iii) (൭)

Creepage distance iv) Disruptive discharge voltage

6 What is non -destructive testing of insulating materials? (5)
7 List the various tests performed on H.V cables? (5)
8 Explain one power frequency test and one impulse voltage test on Insulators. (5)
PART 13
Answer any two full questions, each carries10 marks.
9 Explain the working of a Cockcroft -Walton circuit with a neat diagram. (10)
10 a) What is a Cascaded Transformer? Why cascading is done? (5)

b) With neat diagram explain a three stage Cascaded Transformer. Label the (5)
power ratings of various stages of the transformer.
11 a) A eight stage Cockraft-Walton circuit has all capacitors of 0.05 ஸம்‌. The (5)
secondary voltage of the supply transformer is 125 kV at a frequency of 150 Hz.
If the load current is 5 mA determine i) the % ripple _ii)voltage regulation
b) Explain the generation of high frequency oscillations from a tesla coil? (5)
PART C
Answer any two full questions, each carries 10 marks.
12 a) With a schematic describe operation of a Marx impulse generator used for (6)

producing high impulse voltage.

b) Draw the basic circuit of Impulse current generator and explain its working. (4)

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