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An induction motor operating on the part of its characteristic beyond the breakdown torque is

  • A.unable to develop any torque at all in that region of its characteristic
  • B.unstable with a constant-torque load
  • C.stable with a constant-torque load
  • D.stable with every kind of load characteristic without exception

Answer: B

Beyond breakdown, torque falls as speed falls, so a momentary slowing reduces the torque further and the machine stalls. That is why the region between standstill and breakdown torque is not a working part of the characteristic.

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