Electrical Machines
An alternator is feeding an infinite busbar. Its prime mover is suddenly shutdown. The alternator will

 come to stand still.
 continue to work as alternator but the direction of rotation will reverse.
 start working as induction motor.
 continue to work as synchronous motor with same direction of rotation.

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Electrical Machines
The synchronous motor can be started by

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

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