Electrical Machines
The synchronous speed of an induction motor will be increased by

  speed can not be increased.
  increasing number of poles.
  increasing of frequency.
  decreasing of frequency.

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Electrical Machines
The armature mmf of a DC machine has

  triangular space distribution and rotates at the speed of armature.
  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.

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