Electrical Machines
Rotor resistance speed control is used in

 synchronous motor.
 dc shunt motor.
 squirrel cage induction motor.
 slip ring induction motor.

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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 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.

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