Electrical Machines
DC machine is a

 none of above are correct.
 convection machine.
 conduction machine.
 both are correct.

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Electrical Machines
The compensating winding in a DC machine

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

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