Electrical Machines
The coil spam

  may or may not be exactly equal to people pitch.
 none of above.
 must be exactly equal to people pitch.
 can never be equal to pole pitch.

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Electrical Machines
The armature mmf of a DC machine has

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

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