Electrical Machines
An IM cannot run at synchronous speed because

  air friction will prevent it.
  induction motor will become synchronous motor.
  none of above.
  rotor torque will not be produced.

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

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