F E192144 Pages:2

Reg No.: Name:

APJ ABDUL KALAM TECHNOLOGICAL UNIVERSITY

FIFTH SEMESTER B.TECH DEGREE EXAMINATION(R&S), DECEMBER 2019

Course Code:EE369
Max. Marks: 100 Duration: 3 Hours
PART A
Course Name: HIGH VOLTAGE ENGINEERING Marks
1 Explain with diagrams, different types of rectifier circuits for producing high (5)

voltage de voltages.

2 What is the principle of operation of a resonant transformer? How isit (5)
advantageous over the cascade connected transformers?

3 Sketch the impulse waveform and define the front and tail times ofanimpulse (5)
waveform. What are the tolerances allowed as per specifications?

4 State the different factors affecting the spark over voltage of Sphere Gaps. (5)

5 Define “complex permittivity”. What are the factors that govern the quantities (5)
“relative permittivity” and “loss factor”?

6 Why earthing and shielding arrangements are needed in Schering bridge (5)
measurements?

7 Elucidate any three high voltage testing standards. (5)

8 Why grounding is very important in high voltage laboratories? (5)

PART 13

Answer any twofull questions, each carries10 marks.

9 ച Why is a Cockcroft-Walton circuit preferred for voltage multiplier circuits? (5)
Explain its working with a schematic diagram.

b) Sketch the schematic of cascade transformers and label the power ratings of (5)

transformers.

10 Describe the working principle of Van De Graff generator. What are the (10)
factors that limit the maximum voltage obtained?

11 Analyse the circuit for generating high frequency damped oscillations using (10)
Tesla coil.

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