Electrical Machines
The field system of an alternator is usually excited

  250 / 250 V DC.
  3 - Φ, 50 Hz and 400 V.
  230 V AC.
  110 / 220 V AC.

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

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