Electrical Machines
The squirrel cage induction motors are provided with blades in order to

  facilitate cooling of rotor.
  none of these.
  balance the rotor dynamically.
  eliminate noise.

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Electrical Machines
The synchronous motor can be started by

  any of the above methods.
  coupling it with a small AC induction motor called the pony motor.
  providing damper winding in its rotor circuit.
  coupling it with a DC compound motor.

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