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The theoretical or stoichiometric air is the quantity

  • A.in excess of what the fuel requires
  • B.remaining unburnt in the flue gas
  • C.exactly sufficient for complete combustion
  • D.actually supplied to the furnace in practice

Answer: C

Correct answer: exactly sufficient for complete combustion

The theoretical or stoichiometric air is the amount calculated from the fuel’s composition to convert all its carbon to carbon dioxide, all its hydrogen to water and all its sulphur to sulphur dioxide, with nothing left over. It is a computed reference quantity, not what is actually supplied - every real furnace supplies more, because perfect mixing is unattainable.

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