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ELECTRICAL MACHINES

Electrical Machines
Maximum allowable acidity level of power transformer insulating oil is generally taken as

  0.3 mg of KOH / gm.
  1 mg of KOH / gm.
 2 mg of KOH / gm.
 0.5 mg of KOH / gm.

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Electrical Machines
Maximum allowable tan - delta (tanδ) of dielectric dispassion factor of power transformer insulating oil is generally taken as

 2 at 90°C.
 0.5 at 90°C.
 3 at 90°C.
  1 at 90°C.

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Electrical Machines
Minimum allowable resistivity of power transformer insulating oil is generally taken as

  1 X 1012 Ω - cm at 27°C and 0.1 X 1012
 2 X 1012 Ω - cm at 27°C and 0.2 X 1012
 3 X 1012 Ω - cm at 27°C and 0.3 X 1012
 4 X 1012 Ω - cm at 27°C and 0.4 X 1012

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Electrical Machines
Maximum allowable moisture content of power transformer insulating oil is generally taken as

 20 ppm.
 45 ppm.
  35 ppm.
 25 ppm.

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Electrical Machines
What does the use the of height flux density value in transformer design lead to?

 Reduced iron loss.
 Increase in weight/KVA.
  Decrease in weight/KVA.
 Reduced copper loss.

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