Electrical Machines
In induction motor wound rotor motor is mainly is used in application where

 power factor is less.
  high starting torque.
  less costly motor is not required.
  low starting torque.

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Electrical Machines
In DC machines, the interpoles are provided

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

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Electrical Machines
Torque angle of a synchorous machine operating from a constant voltage bus is usually defined as the space angle between

  Rotor mmf wave and stator mmf wave.
 Stator mmf wave and resultant flux density.
 Rotor mmf wave and resultant flux density wave.
 Stator mmf wave and resultant mmf wave.

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