Electrical Machines
The three point starter is used for

  Shunt, compound and series motor.
  Shunt motor.
  Series motor.
  Shunt motor as well as compound motors.

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Electrical Machines
The compensating winding in a DC machine

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

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