Electrical Machines
The compensating winding in a DC machine

 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 commutating poles for improving commutation.
  is located on pole shoes to avoid the sparking at the brushes.

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Electrical Machines
With the increase in speed of DC motor

 Back emf falls and line current increase.
 Both back emf as well as line current fall.
 Both back emf as well as line current increase.
  Back emf increase but line current falls.

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