Discussion
An active load torque is one that
Answer: A
Correct answer: can drive the motor as well as oppose it
An active load carries its own store of energy and can return it - a suspended weight, a train on a gradient, a wound spring. Its torque acts in the same direction whichever way the drive turns, so it opposes a hoist and drives a lower. A passive load such as friction or a fan always opposes the motion and reverses sign when the motion does, so it can never drive the machine.
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