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Question
3
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A voltage commutated chopper has the following parameters: Vs = 220 V. Commutation circuit: L = 20 μH and C = 50 μF. Find the turn-off time for the main SCR with a constant load current of 80 A and Ton = 800 μsecs.
1. 137.5 μs 2. 1075 μs 3. 49.67 μs 4. 200 μs
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Question
9
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A voltage commutated chopper feeds power to an electric car (battery-powered). The battery voltage is 60 V. The SCR turn-off time is 20 μs. Calculate the value of capacitor (C) required for the commutating circuit.
1. 400 μF 2. 40 nF 3. 40 μF 4. 0.4 mF
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