Electrical Machines
A 3 - Φ, 4 pole IM is supplied from a 50 Hz source. Calculate rotor frequency when rotor runs 600 rpm?

  30 Hz.
  Can be determined.
 20 Hz.
 35 Hz.

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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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