Results of a flue gas analysis indicate a...

Question 1 / 205eccefa0bacbc34ba4d46ea6

Question 1 of 205eccefa0bacbc34ba4d46ea6

Results of a flue gas analysis indicate a high percentage of carbon dioxide and a low percentage of carbon monoxide, approaching maximum efficiency. This condition coincides with which area(s) on the graph shown in the illustration? See illustration SG-0021.

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🔍 Key Concepts

• Combustion efficiency curve on SG-0021 and where the CO₂ percentage reaches its peak • Relationship between CO (carbon monoxide) levels and how completely the fuel is burned • How excess air (x‑axis) affects CO₂ and CO percentages on the flue gas analysis graph

💭 Think About

• On the graph, find where CO₂ is at or near its maximum value and CO is at or near its minimum. Which labeled region(s) correspond to this area? • Look at how the flame description and stack appearance change as you move from insufficient air to excess air. In which region(s) does the chart describe nearly complete combustion? • As excess air increases beyond the most efficient point, what happens to the CO₂ reading on the chart, and which regions represent that trend?

✅ Before You Answer

• Identify the peak of the CO₂ curve and confirm whether that peak lies within one or more labeled areas on the x‑axis (A, B, C, D, E). • Confirm that the chosen region(s) also show low CO and descriptions such as clear stack or clean flame, indicating nearly complete combustion. • Ensure you are not picking an area where CO₂ is already decreasing due to excess air dilution, even if CO remains low.

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Question 1 of 20

B and C

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Question 1 / 205eccefa0bacbc34ba4d46ea6

Question 1 of 205eccefa0bacbc34ba4d46ea6

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Question 1 of 20

5eccefa0bacbc34ba4d46ea6

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🔍 Key Concepts

💭 Think About

✅ Before You Answer

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