Electrical Machines
In a DC machine the armature mmf is

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

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Electrical Machines
With the increase in speed of a DC motor

 back emf falls and line current increases.
 back emf increases but line current falls.
 both back emf as well as line current fall.
 both back emf as well as line current increase.

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