148. To avoid commutation failure a) circuit turn-off time must be greater than the thyristor turn-off time b) circuit turn-off time must be lesser than the thyristor turn-off time c) circuit turn-off time must be equal to the thyristor turn-off time d) none of the above mentioned
148. To avoid commutation failure a) circuit turn-off time must be greater than the thyristor turn-off time b) circuit turn-off time must be lesser than the thyristor turn-off time c) circuit turn-off time must be equal to the thyristor turn-off time d) none of the above mentioned
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Answer: a
Explanation: If the thyristor turn off time is more than the circuit turn off time, the circuit
will be turned off and the thyristor will keep conducting, which is not at all desirable.