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1. |
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 |
Answer» E. | |