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

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

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Electrical Machines
A 3-φ alternator has negligible stator resistance. A short circuit test is conducted on this alternator. At a particular speed, a field current of If1 is required to drive the rated armature current. If the speed of the alternator is reduced to half, the field current required to maintain rated armature current

 Would be equal to If1/2.
  Cannot be predicted due to insufficient data.
 Would be equal to If1.
 Woud be equal to 2If1.

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