Electrical Machines
In induction motor wound rotor motor is mainly is used in application where

  low starting torque.
 power factor is less.
  less costly motor is not required.
  high starting torque.

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Electrical Machines
Compensating windings are used in DC generators

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

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Electrical Machines
The 3 - Φ induction motors are, by a very considerable margin, the most widely used AC motors as

  these are cheaper in cost, simple and rugged in construction.
  they are capable of operation under range of leading and lagging pf.
  they have maximum efficiency and maximum starting torque.
  they have very good speed regulation.

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