Electrical Machines
The direction of rotation of a DC compound motor can be reversed by interchanging

 shunt field connections.
 series field connections.
 armature connections.
 armature or field connections.

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

  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.
  Increase in speed demanding more armature current.

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