Electrical Machines
In shunt dc motor the direction of rotation of the motor will reversed. When

  either field terminals are reversed or armature terminals are reversed.
  none of above.
  only field terminals are changed.
  only armature terminals are reversed.

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Electrical Machines
In DC machines, the interpoles are provided

  to make commutation spark less.
 to counteract demagnetizing effect of armature mmf in commutating zone.
  both (B) and (C).
 to counteract the reactance voltage and the cross-magnetizi

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

  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.
  interchanging two supply phases for quick stopping.

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