Electrical Machines
The armature mmf of a DC machine has

  triangular space distribution and is stationary in space.
  triangular space distribution and rotates at the speed of armature.
 stepped distribution and rotates at the speed of armature.
  trapezoidal space distribution and is stationary in space.

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Electrical Machines
In a DC machine the armature mmf is

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

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