Question

Gross and net calorific value of fuel will be the same :

• A. if its ash content is zero
• B. under no circumstances
• C. if its carbon content is very low
• D. if its hydrogen/hydrogen compound content is zero

Answer 1

The correct option is D if its hydrogen/hydrogen compound content is zero

The gross or high heating value is the amount of heat produced by the complete combustion of a unit quantity of fuel.

The net, or lower, value is determined by calculation and equals the gross calorific value minus the latent heat of the water vapor formed from the combustion of hydrogen and from any moisture present in the fuel.

Gross and net calorific value of a fuel will be the same if its hydrogen compound content is zero.

Hence, option $D$ is correct.