STUPIDSID
Solve any four Q1 (a,b,c,d,e)
1(a)
With a neat sketch explain trigaton spark gap used in impulse generators.
5 M
1(b)
Explain the phenomenon of treeing in solid insulating materials under electrical Stress.
5 M
1(c)
Explain clearly suspended particle mechamism of liquid breakdown.
5 M
1(d)
What is Partial discharge? Differentiate between internal and external partial discharges.
5 M
1(e)
State and explain Paschen's law.
5 M
2(a)
Explain with neat diagrams, why are capcitance voltage dividers preferred for high ac voltage measurements?
10 M
2(b)
Explain the streamer theory of breakdown in air at atmospheric pressure.
10 M
3(a)
Describe the principle of operation of a resonant transformer? How it is advantageous over the cascade connectd transformers?
10 M
3(b)
With a neat sketch, explain the working of a Van-De-Graff generator. What are the factors that limit the maximum output volatge obtained ?
10 M
4(a)
Expalin how a sphere gap can be used to measure the peak value of voltages. What are the parameters and factors that influence such voltage measurement?
10 M
4(b)
Describe in brief various tests carried out on 'Bushings'. 10
10 M
5(a)
Draw and explain a three stage Marx Impulse generator circuit and discuss its applications.
10 M
5(b)
Derive an expression for ripple voltage of a Multistage Cock Croft - Walton circuit.
10 M
6(a)
Explain Thermal breakdown in solid dielectrics. How this meachanism is more significant than the other mechanisms.
10 M
6(b)
What are the various factor to be considered while designjng a High Voltage Laboratory?
10 M
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