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.
  starting the motor on load which is more than the rated load.
  interchanging two supply phases for quick stopping.

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Electrical Machines
In a synchronous generator with constant steam input supplies power to an infinite bus at a lagging power factor. If the excitation is increased

 both power angle and power factor increase
 power angle decrease and power factor increase
 power angle increase and power factor decrease
 both power angle and power factor decrease

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