Discussion
A three-phase fully controlled bridge fed from a 415 V line supply is fired at 30 degrees. Its mean output voltage is nearest to
Answer: C
With a line peak of 587 V, \( V_{dc} = (3 \times 587/\pi)\cos 30° = 560 \times 0.866 = 485 \) V. Six pulses per cycle give both this high mean and a small ripple, which is why three-phase supply is used for any sizeable drive.
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