Discussion
The firing angle at which a fully controlled bridge gives zero mean output voltage is
Answer: D
Correct answer: 90 degrees
Since \( V_{dc} \propto \cos\alpha \), the mean output passes through zero where the cosine does, at 90 degrees. Below that angle the bridge rectifies and delivers power to the machine; above it the mean voltage is negative and, with the current still flowing in the same direction through the thyristors, power flows back to the supply. Ninety degrees is therefore the boundary between rectification and inversion.
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