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

 power factor and supply voltage during hunting.
  power factor and DC excitation at constant load.
 supply voltage and field current at constant excitation.
 supply voltage and excitation current at constant load.

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

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

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