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Electrical Machines

Electrical Machines
Hysteresis loss will depends on

 f1.6
 f
 f³
 f²

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Electrical Machines
A 8 pole, 50 Hz single phase induction motor is running at 690 rpm. Its slip with respect to forward field is

 -0.08
 -1.92
 1.92
 0.08

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Electrical Machines
Breather is provided in a transformer to

 absorb moisture from air entering in transformer.
 provide cold air in transformer.
  absorb moisture of air during breathing.
 filter the transformer oil.

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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

 Kef2Kf2Bm.
 Kef2KfBm2.
  Kef2Kf2Bm2.
 KefKf2Bm2.

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Electrical Machines
In an induction motor, air gap power is 10 Kw and mechanically developed power is 8 Kw. What are the rotor ohmic losses?

 3KW
 1.5KW
 0.5Kw
 2KW

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Electrical Machines
A DC motor with armature resistance of 0.5 ohms connected directly to a 220 Volt supply. If the armature is stationary then the current flowing through the armature is

 440 A.
 340 A.
 570 A.
 250 A.

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