Electrical Machines
In a synchronous motor electromagnetic power varies

None of these
 directly as square of applied voltage
 inversely as applied voltage
 directly as applied voltage

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Electrical Machines
In case of 3 - Φ IM, plugging means

  starting the motor on load which is more than the rated load.
  interchanging two supply phases for quick stopping.
  pulling the motor directly on line without a rotor.
  locking of rotor due to harmonics.

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