Electrical Machines
Synchronous condensers are used to

 reduce hunting
All of these
 improve the power factor
 improve starting torque

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

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

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