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Electrical Machines

Electrical Machines
In a transformer maximum flux density is not constant, the eddy current loss varies as

 f
 f²
 V
 V²

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Electrical Machines
In alternator, the rotary part is

  magnetic field poles.
 core.
 none of these.
 armature.

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Electrical Machines
Flux density under leading pole tips in case of generator will

 decrease
None of these
 either increase or decrease
 increase

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Electrical Machines
Silicon content in steel lamination is kept within 5% as it

 increases hysteresis loss.
 Increases cost.
All of these
 makes the material brittle.

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Electrical Machines
What will be the eddy current loss if the supply frequency of a transformer becomes double?

 Doubled.
 Four times.
 Eight times.
 Remains same.

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Electrical Machines
Armature resistance control method is used for the _______ ?

 both 1 and 2
 below rated speed
None of these
 above rated speed

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