Electrical Machines
What happens if fifth multiples of harmonics is given to induction motor?

  Fail to start.
  Either short circuit or open circuit occurs.
  It will rotates in reverse direction.
  It will rotates in normal operation.

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

 start working as induction motor.
 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.

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