Electrical Machines
The basic function of a transformer is to change

 the power factor
 the frequency
 the power level
 the level of the voltage

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Electrical Machines
The armature mmf of a DC machine has

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

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