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Electrical Machines

Electrical Machines
In a synchronous motor, damper windings are provided on

  rotor shaft.
  stator frame.
  pole faces.
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

 Kef2KfBm2.
  Kef2Kf2Bm2.
 KefKf2Bm2.
 Kef2Kf2Bm.

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Electrical Machines
Type of single phase motor having highest power factor at full load is

  capacitor run.
  shaded pole type.
  capacitor start.
  split phase.

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Electrical Machines
The output power of any electrical motor is taken from the

 Field.
 Coupling mounted on the shaft.
 Motor frame.
 Armature.

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Electrical Machines
Total core loss is also called as -------------?

 Eddy current loss
 Copper loss
 Hysteresis loss
 Magnetic loss

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Electrical Machines
What is the effect of armature reaction ?

 Armature flux weakens the main field flux.
 None of the options.
 Armature flux distorts the main field flux.
  Both option B and C.

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