Electrical Machines
Armature reaction in a DC machine

 is in direct opposition to the main poles.
  makes an angle of 90° with the main pole axis.
 is in the same direction as the main poles.
 makes an angle with the main pole axis which is load dependent.

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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 field poles.
  stationary with respect to armature.

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