Electrical Machines
In a DC machine the armature mmf is

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

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Electrical Machines
In a DC shunt generator working on load, the brushes are moved forward in the direction of rotation, as a result of this, commutation will

  worsen and terminal voltage will rise.
  worsen and terminal voltage will fall
 improve but terminal voltage will fall.
  improve and terminal voltage will rise .

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