A 40 kVA transformer has iron loss of 450 W and full-load copper loss of 850 W. If the powerfactor of the load is 0.8 lagging, the full-load efficiency of the transformer is
  • a)
    85.2%
  • b)
    96.1%
  • c)
    78.5%
  • d)
    91.2%
Correct answer is option 'B'. Can you explain this answer?

Electrical Engineering (EE) Question

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