Electrical Machines
To achieve spark less commutation brushes of DC generator are rocked ahead so as to bring them

 in magnetic neutral axis.
 just ahead of magnetic neutral axis.
 just behind the magnetic neutral axis.
None of these

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Electrical Machines
For a given torque, reducing divertor resistance of a DC series motor

  Increase in speed demanding more armature current.
  Decrease in speed but armature current remains the same.
  Decrease in speed demanding less armature current.
  Increase in speed but armature currnet remains the same.

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