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Questions and Answers
Excess air is the amount of air supplied to a combustion process in addition to the theoretical air required for perfect combustion. It is calculated using the equation: excess air = \frac{{\text{{actual air supplied}} - \text{{theoretical air}}}},{{\text{{theoretical air}}}} \times 100%$
Excess air is the amount of air supplied to a combustion process in addition to the theoretical air required for perfect combustion. It is calculated using the equation: excess air = \frac{{\text{{actual air supplied}} - \text{{theoretical air}}}},{{\text{{theoretical air}}}} \times 100%$
- Excess air is always greater than the theoretical air.
- Excess air is always less than the theoretical air.
- Excess air is equal to the theoretical air.
- The relationship between excess air and theoretical air depends on the fuel and combustion process. (correct)
Which element requires the least amount of air for complete combustion?
Which element requires the least amount of air for complete combustion?
- Sulfur
- Carbon
- Hydrogen (correct)
- Oxygen
What is the combustion equation for hydrogen?
What is the combustion equation for hydrogen?
- C + O2 -> CO2
- S + O2 -> SO2
- 2H2 + O2 -> 2H2O (correct)
- 2N2 + O2 -> 2N2O
What is the molar mass of carbon dioxide (CO2)?
What is the molar mass of carbon dioxide (CO2)?
What is the mass of air required for the combustion of 1 kg of carbon?
What is the mass of air required for the combustion of 1 kg of carbon?
Which equation represents the air-fuel ratio (AF)?
Which equation represents the air-fuel ratio (AF)?
Which equation calculates the percent of excess air in terms of the air-fuel ratio?
Which equation calculates the percent of excess air in terms of the air-fuel ratio?
What is the theoretical air-fuel ratio for the perfect combustion of methane (CH4)?
What is the theoretical air-fuel ratio for the perfect combustion of methane (CH4)?
If the air-fuel ratio for methane combustion in a particular boiler is 20.64, what is the percent of excess air supplied?
If the air-fuel ratio for methane combustion in a particular boiler is 20.64, what is the percent of excess air supplied?
According to the text, what is the mass of air required for the combustion of 1 kg of hydrogen?
According to the text, what is the mass of air required for the combustion of 1 kg of hydrogen?
According to the text, what is the mass of air required for the combustion of 1 kg of sulfur?
According to the text, what is the mass of air required for the combustion of 1 kg of sulfur?
According to the text, what is the theoretical air required for the combustion of carbon, hydrogen, and sulfur?
According to the text, what is the theoretical air required for the combustion of carbon, hydrogen, and sulfur?
According to the text, how is excess air calculated?
According to the text, how is excess air calculated?
