A 250 kVA transformer has full load Cu and iron losses of 1800 W and 1000 W respectively. For what value of load will the transformer have maximum efficiency

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A 250 kVA transformer has full load Cu and iron losses of 1800 W and 1000 W respectively. For what value of load will the transformer have maximum efficiency:

  1. 52.55 kVA
  2. 120.38 kVA
  3. 159.65 kVA
  4. 186.33 kVA

Correct answer: 4. 186.33 kVA

Formula:

Maximum efficiency load = Full load kVA * √(Iron loss/Full load Cu loss)

= 250 * √(1800/1000) = 186.33 kVA

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