Question 217Electricity & Electronics - 1st Asst/Chief

The correct answer is D) by applying torque in the opposite direction of rotation direction, the motor briefly regenerates power back into the mains, which rapidly slows down the motor. When a motor is driven in the opposite direction of its current rotation, it acts as a generator, briefly regenerating power back into the electrical mains. This regenerative braking effect rapidly slows down the motor, as the generated power is not used to drive the motor but instead is fed back into the power source. The other options are incorrect because applying torque in the same direction of rotation would accelerate the motor, not slow it down, and regenerating power into the mains would not rapidly speed up the motor, but rather slow it down.