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Excess air is quoted as a percentage of

  • A.the air that is actually supplied
  • B.the total flue gas produced
  • C.the quantity of fuel burned
  • D.the theoretical air requirement

Answer: D

Twenty per cent excess air means one point two times the theoretical amount. Using the supplied air as the denominator gives a smaller number and is the most frequent error in these problems. The denominator is always the theoretical requirement.

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