STUPIDSID
Attempt any four:
1 (a)
What are electro-negative gases? Why is the breakdown strength higher in these gases compared to that in other gases.
5 M
1 (b)
Explain the phenomenon of tracking in solid insulating materials under electrical stress. How it can be minimized.
5 M
1 (c)
With a neat sketch explain trigatron spark gap used in impulse generators.
5 M
1 (d)
What are commercial liquid dielectrics, and how are they different from pure liquid dielectrics?
5 M
1 (e)
With a neat sketch explain Hall Generators for measurement of high currents.
5 M
2 (a)
Explain with neat diagrams the principle of operation of an Electrostatic voltmeters. Discuss its advantages and limitations for high voltage measurements.
10 M
2 (b)
Why is Cockcroft-Walton circuit preferred for voltage multiplier circuits? Explain its working with a schematic diagram.
10 M
3 (a)
What is Paschen's law? How to do account for the optimum voltage for breakdown under a given 'p X d condition?
10 M
3 (b)
Describe in brief various tests carried out on overhead line insulators.
10 M
4 (a)
Explain 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)
In an experiment in a certain gas it was found that the steady state current is 5.5 × 10-8 A at 8 KV at distance of 0.4 cm between the plane electrodes. Keeping the field constant and reducing the distance to 0.1 cm results in a current of 5.5 ×10-9 A. Calculate Townsend's primary ionization coefficient α.
10 M
5 (a)
Explain the various theories that explain breakdown in commercial liquid dielectrics.
10 M
5 (b)
What is 'thermal breakdown' in solid dielectrics, and how is it practically more significant than other mechanism.
10 M
6 (a)
Describe the construction, principle of operation and application of 3-state Marx generator circuit.
10 M
6 (b)
What are the various factors to be considered while designing a High Voltage Laboratory?
10 M
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