Electrical Machines
An inverted V-curve of synchronous motor shows the variation of

 supply voltage and field current at constant excitation
 power factor and dc excitation at constant load
All of these
 power factor and supply voltage during hunting

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

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

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