Electrical Machines
Which of the following DC motors has got maximum relieving property?

 Shunt.
 Cummulative compound.
 Differentical compound.
  Series.

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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.
  locking of rotor due to harmonics.
  pulling the motor directly on line without a rotor.
  interchanging two supply phases for quick stopping.

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