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B- Give short answers B.1: Why is a Cockcroft-Walton circuit preferred for voltage multiplier circuits? Explain its working with a schematic diagram. B.2: Describe, with a neat sketch, the working of a Van de Graaff generator. What are the factors that limit the maximum voltage obtained? B.3: Explain the different schemes for cascade connection of transformers for producing very high ac voltages. B.4: What is the principle of operation of a resonant transformer? How is it advantageous over the cascade connected transformers? B.5: What is a Tesla coil? How are damped high-frequency oscillations obtained from a Tesla coil? B.6: Define the front and tail times of an impulse wave. What are the tolerances allowed as per the specifications? B.7: Give the Marx circuit arrangement for multistage impulse generators. How is the basic arrangement modified to accommodate the wave time control resistances? B.8: How are the wave-front and wave-tail times controlled in impulse generator circuits?