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An efficiency quoted on the gross calorific value is

  • A.lower than the same efficiency quoted on the net value
  • B.higher than the same efficiency quoted on the net value
  • C.the same
  • D.meaningless unless the fuel contains no hydrogen

Answer: A

The gross figure is the larger denominator, so the same useful output divided by it gives the smaller number. Comparing two boilers quoted on different bases can reverse the apparent ranking, which is why the basis must always be stated.

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