Electrical Machines
Dissolve gas analysis of transformer oil is carried out to determine

 condition of transformer oil.
 condition of bushing stud.
  condition of transformer.
 condition of bushings.

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Electrical Machines
Armature reaction in a DC machine

 is in the same direction as the main poles.
 makes an angle with the main pole axis which is load dependent.
  makes an angle of 90° with the main pole axis.
 is in direct opposition to the main poles.

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