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Fuels

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Questions and Answers

Which elements are the main combustible elements in a fuel?

Oxygen and nitrogen
Sulfur and oxygen
Carbon and sulfur
Carbon and hydrogen (correct)

What is the chemical formula for sulfur dioxide?

SO3
SO2 (correct)
CO2
H2O

What is perfect combustion also known as?

Spontaneous combustion
Stoichiometric combustion (correct)
Exothermic combustion
Incomplete combustion

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

Sulfur (B) Signup and view all the answers

What is the equation for the incomplete combustion of sulfur?

2S + O2 -> SO2 + S (D) Signup and view all the answers

Why is the formation of free sulfur undesirable?

It represents a waste of fuel (B) Signup and view all the answers

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

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

What is the equation for the complete combustion of carbon?

$C + O_2 \rightarrow CO_2$ (B) Signup and view all the answers

What is the equation for the incomplete combustion of carbon?

$C + \frac{1}{2}O_2 \rightarrow CO$ (A) Signup and view all the answers

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

Reduced efficiency (D) Signup and view all the answers

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