Electrical Machines
Rotating magnetic field is produced in an induction motor because of

None of these
  rotor winding.
  stator winding.
  either stator winding or rotor winding.

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

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

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