Discussion
Assertion (A): A fully controlled bridge can return power to the supply.
Reason (R): Its mean output voltage reverses when the firing angle exceeds 90 degrees.
Select the correct option.
Answer: B
With the voltage reversed and the current keeping its sign, the power flow reverses, which is exactly inversion. The load must contain an emf of the right polarity to sustain the current, which in a drive is the machine's own back emf.
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