Electrical Machines
In dc machines, the armature windings are placed on the rotor because of the necessity for

 development of torque
 generation of voltage
 commutation
 electromechanical energy conversion

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Electrical Machines
Skewing of the rotor in a 3 - Φ squirrel cage induction motor reduces

  noise, parasitic and starting torque, but increase pull out torque.
  noise, parasitic torque, starting torque and pull out torque.
  noise and parasitic torque, but increase starting and pull-out torque.
  noise and pullout torque, but increase parasitic and starting torque.

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