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Electrical Machines

Electrical Machines
Swinburne test is conducted under which of the following condition?

 any of the above
 half load
 no load
 full load

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Electrical Machines
Oil is provided in an oil filled transformer for

 cooling.
  both cooling and insulation.
 lubrication.
  insulating.

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Electrical Machines
Tap changer is generally provided in

 current transformer.
 voltage transformer.
 earthing transformer.
  power transformer.

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Electrical Machines
Which of the following transformer insulating oil generally used in India?

 Aromatics based insulating oil.
 Naphtha based insulating oil.
  Paraffin based insulating oil.
 Olefin based insulating oil.

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Electrical Machines
Open circuit test on transformer gives

 eddy current loss
 hysteresis loss
 copper loss
 both 1and 2

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Electrical Machines
The armature of DC machine is made of silicon steel lamination to

 reduce both eddy current and hysteresis loss.
 reduce eddy current loss only.
 increase the permeability.
 reduce hysteresis loss only.

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