STUPIDSID
Solve any one question fromQ.1(a,b,c) and Q.2(a,b,c)
1(a)
Defien Townsend first and second ionization coeeficient How is the condition for breakdown obtained in Townsend discharge?
8 M
1(b)
What is the stress oil volume theory and how does it explain breakdown in large volume of commercial liquid dielectrics.
8 M
1(c)
Describe the various factors that inflence breakdown in a gas.
4 M
2(a)
What is thermal breakdown on soild dielectrics and how it is practically more significant then other mechanisms?
8 M
2(b)
Describe the phenomenon of lightning and explain the terms pilot streamer, stepped leader, return streamer and dart leader.
8 M
2(c)
Explain the various factors that influence breakdown in pure liquid dielectrics and commercial liquid dielectrics.
4 M
Solve any one question fromQ.3(a,b) and Q.4(a,b)
3(a)
Give the different circuits that produce impulse wave and explain clearly their merit and demerits.
8 M
3(b)
Explain one method of controlled tripping of impulse generator why is controlled tripping necessary.
8 M
4(a)
With a neat circuit diagram, describe the construction principle of operation and application of Marx's impulse generator.
8 M
4(b)
Draw the standard wave shape of impulse voltage wave and specify the values of th e wave front and wave tail.
8 M
Solve any one question fromQ.5(a,b) and Q.6(a,b)
5(a)
Explain sphere gap measurement of high voltages.
8 M
5(b)
Explain the method of measurement of partial discharge using Schering Bridge.
8 M
6(a)
Explain current transformer with electro-optical signal converter for EHV system.
8 M
6(b)
Explain Generating voltmeter for measurement of high voltages.
8 M
Solve any one question fromQ.7(a,b) and Q.8(a,b)
7(a)
What are the different power frequency tests done on insulator? Mention the procedure for testing?
9 M
7(b)
Classify the different high voltage laboratories and give salient features of each of them.
9 M
8(a)
Explain the partial discharge tests on high voltages cables. How is the fault in the insulation located in this test?
9 M
8(b)
Explain earthing and safety measures used in high voltage laboratory.
9 M
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