Electrical Machines
Which of following DC generator will be in a position to build up without any residual magnetism in the field?

  Compound.
 Shunt.
  Series.
  Separately excited.

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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

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

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