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

 field current on X-axis and armature current on Y-axis
 field current on Y-axis and power factor on X-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
The mmf produced by rotor currents of a 3 - Φ induction motor

  rotates at synchronous speed with respect to rotor.
  rotates at slip speed with respect to stator mmf.
  is at standstill with respect to stator mmf.
  rotates at the speed of rotor in the air gap.

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