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Discussion

Match each term with what it describes.
List I
A. Theoretical air
B. Excess air
C. Orsat analysis
D. Net calorific value
List II
1. a dry basis flue gas composition
2. the stoichiometric requirement
3. the heating value with water as vapour
4. the amount supplied above that requirement

  • A.A-2, B-4, C-3, D-1
  • B.A-3, B-1, C-4, D-2
  • C.A-2, B-4, C-1, D-3
  • D.A-4, B-2, C-1, D-3

Answer: C

The four appear together in almost every combustion problem, and confusing any pair leads to an answer that is internally consistent but wrong. Each has a precise definition worth memorising. Each appears in almost every furnace problem.

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