Electrical Machines
The teeth in the armature of a DC machines are sometimes skewed. This is done to reduce

 eddy electric current loss.
 hysteresis loss.
 vibrations.
 copper loss.

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Electrical Machines
The mmf produced by rotor currents of a 3 - Φ induction motor

  rotates at the speed of rotor in the air gap.
  rotates at slip speed with respect to stator mmf.
  is at standstill with respect to stator mmf.
  rotates at synchronous speed with respect to rotor.

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