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

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

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Electrical Machines
Slip speed is the

  difference of synchronous speed and actual rotor speed.
  difference of actual rotor speed and synchronous speed.
  half of the sum of synchronous and rotor speeds.
  sum of synchronous and rotor speeds.

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