Electrical Machines
If the excitation is critical, the power factor of the alternator is

 unity power factor.
None of these
 lagging power factor.
 leading power factor.

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Electrical Machines
In DC machines, the interpoles are provided

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

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Electrical Machines
Consider the following statements : Interpoles in dc machines 1. reducearmature reaction effects in the interpolar region 2. have the same dimension as main polls 3. have their windings connected in series with the armature 4. have same number of turns as the armature 5. have the polarity same as that of the main pole ahead in a motor From these, the correct statements are

 1 and 3
 1, 3 and 5
 1, 2 and 3
 1, 2, 3 and 5

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