Electrical Machines
Which of following winding is connected in series with armature winding of DC machine?

 Auxiliary winding.
 Commutating pole winding.
 Compensating winding.
 Both Compensating and Commutating pole winding.

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Electrical Machines
In DC machines, the interpoles are provided

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

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Electrical Machines
Which of the following factors improve commutation in a dc machine ? 1. High contact resistance of brushes 2. High inductance of the coils undergoing commutation 3. Shifting of brushes in the direction of rotation for a generator and in the opposite direction For a motor 4. Narrow width for the commutation bars Select the correct answer using the codes given below : Codes :

 1 and 3
 2, 3 and 4
 1, 2 and 4
 1, 2, and 3

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