Calculate the circuit turn-off time for 3-Φ Fully controlled rectifier if the firing angle is 170° and supply frequency is 50.5 Hz.
(a) 32.4 msec
(b) 35.2 msec
(c) 39.3 msec
(d) 31.5 msec
This question was addressed to me in an internship interview.
The origin of the question is Solid-State Switching Circuits in chapter Introduction to Solid-State Switching Circuits of Electric Drives