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

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

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Electrical Machines
In the 3-phase induction motor, the resultant flux is of a constant nature and is

 3 times maximum value of flux due to any phase
 3/2 times maximum value of flux due to any phase
 1/2 times maximum value of flux due to any phase
 equal to φm, where φm is the maximum flux due to any phase

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