Discussion
Operation in the second quadrant, with positive speed and negative torque, is
Answer: B
Correct answer: forward braking
Positive speed with negative torque means the machine opposes the motion it is undergoing, so the power is negative and the drive is braking while still running forward. This is the quadrant a hoist enters when it slows a rising load, and the one a train enters when it brakes on the level. Reverse braking is the fourth quadrant, with negative speed and positive torque.
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