Electrical Machines
Flashing of DC generator means

 neutralization of residual magnetism.
  increasing flux density by providing extra ampere-turns in field.
None of these
  creation of residual magnetism by a DC source.

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

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

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