Question:
The amount of air actually supplied divided by the theoretical air required, expressed as a percentage above theoretical air, is known as:
The amount of air actually supplied divided by the theoretical air required, expressed as a percentage above theoretical air, is known as:
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Exam Tip: Extra air supplied in combustion = Excess Air.
Updated On: Jun 9, 2026
- Percentage conversion
- Excess air
- Degree of completion
- Calorific value
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The Correct Option is B
Solution and Explanation
Concept:
In combustion processes, more air than the stoichiometric requirement is often supplied to ensure complete burning. This additional air is called excess air.
Step 1:
Theoretical air is the exact amount of air needed for complete combustion with no oxygen left over.
Step 2:
Practical systems usually provide more than theoretical air for safety and complete combustion.
Step 3:
The extra amount above theoretical requirement is: $$\text{Excess Air} = \frac{\text{Actual Air} - \text{Theoretical Air}}{\text{Theoretical Air}}\times 100$$
Step 4:
This matches the definition of excess air.
Step 5:
Therefore, the correct option is (B).
In combustion processes, more air than the stoichiometric requirement is often supplied to ensure complete burning. This additional air is called excess air.
Step 1:
Theoretical air is the exact amount of air needed for complete combustion with no oxygen left over.
Step 2:
Practical systems usually provide more than theoretical air for safety and complete combustion.
Step 3:
The extra amount above theoretical requirement is: $$\text{Excess Air} = \frac{\text{Actual Air} - \text{Theoretical Air}}{\text{Theoretical Air}}\times 100$$
Step 4:
This matches the definition of excess air.
Step 5:
Therefore, the correct option is (B).
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