Oxygen content in a flue gas was found to be 4%. It implies that excess air used for combustion was around ______________ percent?
Correct answer: C. 20
- A. 4
- B. 96
- C. 20
- D. 40
Explanation
Using dry flue gas, excess air is approximately 100 times O₂ divided by 21 minus O₂: 100(4)/(21−4) ≈ 23.5%, which is around 20%.
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