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

  power factor and DC excitation at constant load.
 supply voltage and field current at constant excitation.
 supply voltage and excitation current at constant load.
 power factor and supply voltage during hunting.

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

 decrease in speed demanding less armature current.
 increase in speed but armature currnet remains the same.
 decrease in speed but armature current remains the same.
 increase in speed demanding more armature current.

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