Discussion
A dual converter feeding a dc motor provides
Answer: A
Correct answer: four-quadrant operation
A dual converter is two fully controlled bridges connected back to back across the armature. One conducts for each direction of current, and each can be operated as a rectifier or as an inverter by taking the firing angle beyond 90 degrees. Between them they give both signs of voltage and both signs of current, that is motoring and braking in both directions of rotation - all four quadrants of the torque-speed plane.
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