Electrical Machines
When operating, two or more transformers in parallel, % impedance of these transformers should be

 proportionate to MVA rating of transformers.
 inversely proportional to MVA rating of transformers.
 such that actual impedance of all transformers would be same.
  same.

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

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