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1. |
A separately excited DC motor is energised from a 440 V, 50 Hz, 3 ϕ full converter. The input voltage to the motor for a firing angle of 45°, in volts, is: |
A. | 420 |
B. | 297 |
C. | 390 |
D. | 260 |
Answer» B. 297 | |