Electrical Machines
In DC machine, the armature windings are placed on the rotor because of necessity for

 generation of voltage.
 development of torque.
 electromechanical energy conversion.
 commutation.

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Electrical Machines
The compensating winding in a DC machine

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

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