Electrical Machines
The synchronous motor can be started by

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

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Electrical Machines
Which of the following is done in speed control of DC motor by field flux control?

 Inserting an additional resistance in the armature circuit.
 Any of above.
 Inserting an additional resistance in the field circuit.
 Inserting resistance to armature circuit and field circuit.

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