Practice Stoichiometric Air-fuel Ratio (afr) (2.2) - Combustion and Fuels

Practice: Stoichiometric air-fuel ratio (AFR)

Lesson 2.2Combustion and Fuels

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9 questions

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6 sample questions

Question 1.
Define stoichiometric air-fuel ratio (AFR).
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It indicates the balance necessary for burning fuel.
Question 2.
What does excess air refer to?
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Consider what happens when more air is added than necessary.
3Question 3.
What is the stoichiometric air-fuel ratio?
- The ratio that ensures complete combustion
- The percentage of air in combustion
- The amount of fuel burned
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Focus on what it means for fuel usage.
4Question 4.
True or False: Excess air is beneficial at all times.
- True
- False
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Consider how air supply impacts combustion.
Question 5.
If a combustion engine operates at a stoichiometric AFR of 14.7:1 and the actual supplied air is 35.4 kg for 2.4 kg of fuel, what is the equivalence ratio?
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Determine stoichiometric air first, then find the equivalence ratio.
Question 6.
A furnace uses 12 kg of air to burn 1 kg of coal. If the actual supply of air is 14 kg, calculate the excess air and discuss its effects on combustion.
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Use the excess air formula and consider the combustion implications.

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