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Fuels

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Questions and Answers

Which element is considered an impurity in a fuel, even though it is combustible?

Sulfur (correct)

Water

Carbon

Oxygen

What is the equation for the incomplete combustion of sulfur?

2S + O2 -> SO3 + 2S

2S + O2 -> SO3 + S

2S + O2 -> SO2 + S (correct)

2S + O2 -> SO2 + 2S

Why is the formation of free sulfur undesirable in combustion?

It is a toxic element

It is a greenhouse gas

It is corrosive to metal surfaces

It represents a waste of fuel (correct)

Which elements in the fuel combine with oxygen during combustion to form carbon dioxide and water vapor?

Carbon Signup and view all the answers

What is the main combustible element in fuels?

Carbon Signup and view all the answers

What is the equation for the combustion of propane (C3H8)?

C3H8 + 3O2 -> 3CO2 + 4H2O Signup and view all the answers

Which of the following is a condition required for complete combustion to occur?

Sufficient air must be admitted to ensure all combustibles are burned. Signup and view all the answers

What is the equation for the complete combustion of carbon?

C + O2 -> CO2 Signup and view all the answers

What is the equation for the incomplete combustion of hydrogen?

2H2 + 1/2O2 -> H2O + H2 Signup and view all the answers

What is the main consequence of incomplete combustion in a boiler?

Reduction in efficiency Signup and view all the answers