Electrical Machines
The leakage reactance of a 3-phase alternator is determined by performing

 open circuit and short circuit tests.
 short circuit and slip tests.
 zero power factor and slip tests.
 open circuit and zero power factor tests.

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Electrical Machines
In DC machines, the interpoles are provided

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

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