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

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

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Electrical Machines
Due to magnetic saturation, the flux per pole in a DC machine without brush shift

 increases in generators but decreases in motor with load.
 decreases in generators and increases in motor with load.
  decreases in both generators and the motors with load.
 increases in both the generators and the motors with load.

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