Electrical Machines
What is the speed of stator rotating magnetic field with respect to rotor rotating magnetic field?

 Synchronous speed
 Slip speed
 Zero
None of these

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Electrical Machines
The synchronous motor can be started by

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

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