Electrical Machines
In large sized DC machines the compensating windings are provided to

None of these
 compensate for the decrease in speed due to increase of load.
  neutralize voltage induced in coil due to fluctuation of l
 reduce eddy current losses by providing local short circuits.

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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

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

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