When too much excess air is supplied to an...

Question 1 / 270705eccefa0bacbc34ba4d46e76

Question 1 of 270705eccefa0bacbc34ba4d46e76

When too much excess air is supplied to an operating boiler, the __________.

Question 1 of 27070

When too much excess air is supplied to an operating boiler, the __________.

🔍 Key Concepts

• excess air in combustion and how it affects temperature and efficiency • relationship between stack gases (flue gas) and heat loss • visual changes in flame appearance when air is too high or too low

💭 Think About

• Think about what happens to flame temperature when you add more air than needed: does the flame get hotter or cooler? • If cooler combustion gases are leaving up the stack, what does that do to the boiler’s overall efficiency? • Which of the options describes a condition that would logically follow from cooler, more diluted combustion gases?

✅ Before You Answer

• Make sure you understand that excess air means more than the chemically required amount for complete combustion • Consider how too much air affects heat transfer to the water/steam vs. heat going out the stack • Eliminate any choices that mainly describe fuel-rich (not air-rich) combustion conditions, such as very sooty or smoky flames

Question 1 of 27070

When too much excess air is supplied to an operating boiler, the __________.

heat loss will be reduced

heat loss will be excessive

flame will impinge on the burner cone

flame will be a deep red color

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