An input voltage of 230 V is applied to a step-up chopper and the output voltage is 690 V. The pulse width of the output voltage, if the thyristor chopper consists of 115 µs non- conducting time is equal to. (a) 232.4 µs (b) 348.5 µs (c) 300.2 µs (d) 235.8 µs

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