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

 Kef2KfBm2.
 Kef2Kf2Bm.
 KefKf2Bm2.
  Kef2Kf2Bm2.

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Electrical Machines
In a DC shunt generator working on load, the brushes are moved forward in the direction of rotation, as a result of this, commutation will

  worsen and terminal voltage will rise.
  worsen and terminal voltage will fall
 improve but terminal voltage will fall.
  improve and terminal voltage will rise .

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