Electrical Machines
The three point starter is used for

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

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Electrical Machines
Compensating windings are used in DC generators

None of these
  mainly to reduce the eddy currents by providing local short circuit.
  to neutralize the cross magnetizing effect of the armature reaction.
  to provide path for the circulation of cooling air.

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