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Three of the following would explain a rise in specific energy consumption. The exception is

  • A.fouling of a heat exchanger
  • B.a compressed air leak that has developed
  • C.an increase in output at constant efficiency
  • D.a fall in output with the fixed load unchanged

Answer: C

Correct answer: an increase in output at constant efficiency

Raising output spreads the fixed load over more units, so specific consumption falls even though the total rises. The other three all raise it: fouling reduces heat transfer, a leak wastes compressed air, and a fall in output leaves the fixed load spread over fewer units.

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