Electrical Machines
Current in a coil undergoing commutation is not able to get reversed completely by the end of commutation period. It is due to

  coil resistance.
  reactance voltage induced in the coil.
 armature emf.
None of these

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Electrical Machines
The compensating winding in a DC machine

  is located on pole shoes for avoiding the flashover at the commutator.
 is located in armature slots for compensation of the armature reaction.
 is located on commutating poles for improving commutation.
  is located on pole shoes to avoid the sparking at the brushes.

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