Electrical Machines
DC generators are usually designed to develop armature voltages not exceeding 650 V because of the limitations imposed by

 starters
 commutator
 field winding
 armature 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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