Electrical Machines
If Ke is eddy current constant, Kf is form factor, f is supply frequency, Bm maximum flux density in core of transformer, the expression of eddy current loss in transformer, is given by

 Kef2Kf2Bm.
 KefKf2Bm2.
  Kef2Kf2Bm2.
 Kef2KfBm2.

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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
What is/are the necessary conditions for voltage build up in self excited generator?

 Field winding should be properly connected to armature winding.
 Poles should contain residual flux.
All of these
 Field winding resistance should be less than critical resistance.

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