Electrical Machines
The rotor of a 3 - Φ wound induction motor is provided with

  heavy copper or aluminium bars placed in rotor slots.
  single phase winding.
  heavy short-circuited end rings.
  three phase winding.

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Electrical Machines
In a DC machine the armature mmf is

  rotating with respect to field poles as well as armature.
  stationary with respect to armature.
  stationary with respect to field poles.
 rotating with respect to field poles.

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