Electrical Machines
The core flux in transformer depends mainly on

 supply voltage, frequency and load
 supply voltage and frequency
 supply voltage
 supply voltage and load

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Electrical Machines
For satisfactory parallel operation of two transformers which of the following conditions is most essential,

 MVA rating of all transformer inversely proportional to impedance.
  polarities of all transformers must be same.
 percentage impedance of all transformers must be same.
 voltage ratio of all transformers must be same.

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