Discussion
An induction motor driven above synchronous speed by its load
Answer: B
Correct answer: generates and returns power to the supply
Driven above \( N_s \) the slip becomes negative, the rotor emf reverses, and the torque opposes the direction of rotation. The machine acts as an induction generator, delivering real power to the supply while still drawing its magnetising reactive power from it. This is the regenerative braking region, used on hoists and on wind turbines with cage generators.
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