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Electrical Machines

Electrical Machines
Hysteresis loss is proportional to

  f.
 f1.5.
 f3.
 f2.

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Electrical Machines
In an induction motor, what is the ratio of rotor input to rotor copper loss?

 1/S
 1/(1-S)
 S
 1-S

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Electrical Machines
What is the shunt resistance component equivalent circuit obtained by no load test of an induction motor representative of ?

 Copper loss
 core loss only
 both 1 and 2
 windage and friction loss

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Electrical Machines
Regenerative braking is possible in

 DC shunt motor with armature resistance control.
  DC shunt motor with field weakening control.
 DC compound motor.
 DC series motor.

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Electrical Machines
From no load to full load the slip will

 slightly decrease.
 not change.
 slightly increase.
None of these

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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

 KefKf2Bm2.
 Kef2KfBm2.
  Kef2Kf2Bm2.
 Kef2Kf2Bm.

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