Electrical Machines
In a DC generator if field winding attains the critical resistance

 machine will generate maximum power.
 the voltage generated will be zero.
 machine will generate maximum voltage.
 field winding will burn.

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Electrical Machines
The synchronous motor can be started by

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

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