Electrical Machines
The armature mmf of a DC machine has

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

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Electrical Machines
Where the shunt generators are widely used?

 Where often load fluctuation is occurred.
 Where voltage variation is needed over a wide load range.
  Where a constant voltage is required over a narrow load range.
 Where the load is very high.

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