Electrical Machines
What is the effect of armature reaction ?

 None of the options.
  Both option B and C.
 Armature flux weakens the main field flux.
 Armature flux distorts the main field flux.

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Electrical Machines
The armature mmf of a DC machine has

  trapezoidal 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.
  triangular space distribution and is stationary in space.

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