Electrical Machines
The air gap between stator and the rotor of the 3 - φ induction motor is kept

  as small as possible.
  depends on the material of stator and the rotor.
  as wide as possible.
  air gap does not matter.

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

ANSWER DOWNLOAD EXAMIANS APP