Electrical Machines
The demagnetising component of armature reaction in a DC generator

  results in sparking trouble.
  increases armature speed.
  reduces inter poles flux density.
  reduces generator emf.

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Electrical Machines
In synchronous generator, inverted V curve is drawn between

 field current on Y-axis and armature current on X-axis
 field current on X-axis and power factor on Y-axis
 field current on Y-axis and power factor on X-axis
 field current on X-axis and armature current on Y-axis

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