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Electrical Machines

Electrical Machines
Eddy current loss will depends on

All of these
 Thickness
 Flux density
 Frequency

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Electrical Machines
Air core transformer as compared to iron core transformer, has

 less magnetic core loss.
  more copper loss.
 more magnetic core loss.
  no magnetic core loss.

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Electrical Machines
The power input to a 3 - φ induction motor is 60 kW and stator loss is 1 kW the rotor cu loss per phase is

  slip X 69 / 3.
  slip X 59 / 3.
 1.
  slip X 50 / 3.

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Electrical Machines
A generator may loose residual magnetism due to

  any of these.
  heating.
  over excitation.
  vibrations.

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Electrical Machines
Open circuit in a transformer is prefered with

 direct current
 high frequency supply
 rated transformer voltage
 rated transformer current

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Electrical Machines
The overall power factor of an on load transformer

 is always leading.
 is always lagging.
 is always unity.
  depends on the power factor of the load.

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MORE MCQ ON Electrical Machines

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