Electrical Machines
To get the speed of DC motor more than normal without wastage of electrical energy _____________ is used.

 rheostatic control.
 any of above method.
 Ward Leonard control.
 none of above.

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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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