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

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

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Electrical Machines
Flashing the field of DC generator means

  neutralising residual magnetism.
  making the magnetic losses forces parallel.
  creating residual magnetism by a DC source.
 increasing flux density by adding extra turns of winding.

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