Electrical Machines
Skewing of cage rotors offers the following advantages

  all of below.
  less noise.
  uniform torque.
  locking tendency is reduced.

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

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