Electrical Machines
If Kh is hysteresis constant, f is supply frequency, Bm maximum flux density in core of transformer, the expression of hysteresis loss in transformer, is given by

  KhfBm1.6.
 KhfBm3.
 KhfBm.
 Khf2Bm1.6.

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Electrical Machines
With the increase in speed of DC motor

  Back emf increase but line current falls.
 Back emf falls and line current increase.
 Both back emf as well as line current increase.
 Both back emf as well as line current fall.

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