In a 50 kVA transformer, the iron loss is 500 W and full-load Cu loss in 800 W, The efficiency of the transformer at full-load at 0.8 p.f. lagging is
  • a)
    92%
  • b)
    89.56%
  • c)
    96.85%
  • d)
    79.82%
Correct answer is option 'C'. Can you explain this answer?

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Answers

Bank Exams India
Jul 17, 2021
Full-load output
= kVA x cosϕ = 50 x 0.8 = 40 kW
Total F.L. losses
=500 + 800 = 1300 W = 1.3 kW
Full-load input = 40 + 1.3 = 41.3 kW

Full-load output= kVA x cos= 50 x 0.8 = 40 kWTotal F.L. losses=500 + 800 = 1300 W = 1.3 kWFull-load input = 40 + 1.3 = 41.3 kW
Full-load output= kVA x cos= 50 x 0.8 = 40 kWTotal F.L. losses=500 + 800 = 1300 W = 1.3 kWFull-load input = 40 + 1.3 = 41.3 kW