Electrical Machines
In synchronous generator V curve is drawn between

 field current on X-axis and power factor on Y-axis.
 either of these.
 field current on Y-axis and armature current on X-axis.
 field current on X-axis and armature current on Y-axis.

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Electrical Machines
Skewing of the rotor in a 3 - Φ squirrel cage induction motor reduces

  noise, parasitic torque, starting torque and pull out torque.
  noise, parasitic and starting torque, but increase pull out torque.
  noise and pullout torque, but increase parasitic and starting torque.
  noise and parasitic torque, but increase starting and pull-out torque.

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Electrical Machines
Flashing the field of DC generator means

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

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