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

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

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Electrical Machines
An inverted V curve of synchronous motor shows variation of

  power factor and DC excitation at constant load.
 supply voltage and field current at constant excitation.
 power factor and supply voltage during hunting.
 supply voltage and excitation current at constant load.

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