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Electrical Machines

Electrical Machines
Oil is provided in an oil filled transformer for

 lubrication.
  insulating.
 cooling.
  both cooling and insulation.

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Electrical Machines
In a transformer operating at constant voltage if the input frequency increases, the core loss

 decrease.
 remains constant.
None of these
 increase.

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Electrical Machines
What will be the maximum power factor of an induction motor for dispersion coefficient of 0.05?

 20.
  0.905.
 1.1.
  0.05.

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Electrical Machines
Transformer action requires a

 increasing magnetic flux.
 alternating electric flux.
 alternating magnetic lux.
 constant magnetic flux.

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Electrical Machines
Which of following DC motors will have percentage increase of input current for the same percentage increase in torque?

 Series.
  Shunt.
 Cummulative compound.
 Differntical compound.

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Electrical Machines
The wattage rating of a ceiling fan motor will be

 10 - 20 W.
  50 - 150 W.
 250 - 500 W.
 200 - 250 W.

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