Discussion
A dc drive is described as four-quadrant. It can therefore
Answer: C
Correct answer: motor and brake in both directions of rotation
The four quadrants are the four combinations of torque sign and speed sign: forward motoring, forward braking, reverse motoring and reverse braking. A four-quadrant drive can produce all of them, so it can accelerate and brake in either direction and reverse through zero speed under control. Hoists, lifts, mill drives and reversing servos all need it; a fan or pump generally does not.
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