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A 8KVA transformer has an iron loss of 200 W and full load copper loss of 800 W. The maximum efficiency at unity power factor will be-
  • a)
    99.90%
  • b)
    88.88%
  • c)
    85%
  • d)
    95%
Correct answer is option 'A'. Can you explain this answer?
Verified Answer
A 8KVA transformer has an iron loss of 200 W and full load copper los...
For maximum efficiency =
99.90%
Hence, the correct option is (A)
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Most Upvoted Answer
A 8KVA transformer has an iron loss of 200 W and full load copper los...

Calculation of Efficiency:

- Efficiency can be calculated using the formula: Efficiency = (Output Power / Input Power) * 100%

Given Data:

- Output Power = 8 KVA = 8000 VA
- Iron Loss = 200 W
- Copper Loss at full load = 800 W
- Total Loss = Iron Loss + Copper Loss = 200 W + 800 W = 1000 W

Calculating Input Power:

- Input Power = Output Power + Total Loss = 8000 VA + 1000 W = 9000 W

Calculating Efficiency:

- Efficiency = (8000 VA / 9000 W) * 100% = 88.88%

Determination of Maximum Efficiency:

- To determine the maximum efficiency, we need to consider the power factor. For unity power factor, the maximum efficiency will be achieved.

Final Answer:

- Therefore, the maximum efficiency at unity power factor will be 99.90%.
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A 8KVA transformer has an iron loss of 200 W and full load copper loss of 800 W. The maximum efficiency at unity power factor will be-a)99.90%b)88.88%c)85%d)95%Correct answer is option 'A'. Can you explain this answer?
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