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

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

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Electrical Machines
No load primary current in a transformer

 leads the applied voltage somewhat less than 90Ã&
 leads the applied voltage by exactly 90Â&
 lags behind applied voltage by exactly 90Â&am
 lags behind applied voltage somewhat less than 90Ã

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