Volumetric composition of flue gas analysed with the Orsat apparatus is : CO2 = 12%, O2 = 8%, CO = nil, N2 = 80%. This flue gas composition indicates that_________________?
Correct answer: D. Excess air has been used for combustion
- A. Pure oxygen has been used for combustion
- B. Nitrogen percentage in the fuel is very high
- C. Hydrogen is not present in the fuel
- D. Excess air has been used for combustion
Explanation
The oxygen remaining after combustion, together with nitrogen from air, indicates that more air than the theoretical requirement was supplied. Pure oxygen would not produce 80% nitrogen, and the analysis cannot establish the fuel's hydrogen content.
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