Electrical Machines
In a 3 - Φ induction motor

  power factor at starting is low as compared to that while running.
  power factor at starting in the same as that while running.
  none of them.
  power factor at starting is high as compared to that while running.

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

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

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