The results of a flue gas analysis indicate...

Question 1 of 270705eccefa0bacbc34ba4d46ea7

The results of a flue gas analysis indicate a very high percentage of oxygen, and a low percentage of carbon dioxide. This condition coincides with which area on the graph shown in the illustration? See illustration SG-0021.

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Question 1 of 27070

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🔍 Key Concepts

• Excess air in combustion and its effect on O₂ and CO₂ readings • How the illustration labels regions with phrases like "high O₂, low CO₂" and describes stack appearance (smoke/flame color) • Relationship between moving to the right on the X‑axis (percentage of air) and changes in CO₂ concentration

💭 Think About

• On the graph, where would you expect to see flue gases that are heavily diluted with air: toward lower or higher air percentages on the X‑axis? • Which labeled region(s) explicitly mention conditions like fuel completely burned and high O₂ / low CO₂ or clear/white stack? • How do CO₂ levels behave once you pass the point of best combustion efficiency—do they keep rising, or start to fall as more excess air is added?

✅ Before You Answer

• Locate the point or band where CO₂ peaks, then see what happens to CO₂ as you move further right (more air) from that point. • Identify any region(s) whose text annotations mention "high O₂" and "low CO₂" directly. • Confirm that the region you select corresponds to a very high O₂ percentage and reduced CO₂ due to dilution with air, not due to incomplete combustion.