Electrical Machines
A 3 - φ induction motor can also be referred to as a

  asynchronous motor.
  shunt motor.
  transformer.
  repulsion motor.

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Electrical Machines
In dc machines, the field system has to be provided on stator unlike synchronous machines Where in it could be on any member, because

 it reduces field structure iron losses
 it gives more uniform air-gap flux distribution
 dc machines are comparatively low rating machines.
 commutator action is not possible otherwise

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