Mechanical Engineering - Thermodynamics - Discussion

Correct Answer is Opt. B. Liquid fuels have higher calorific value than solid fuels.

Which of the following is "INCORRECT" Incorrect not correct. Therefore option (c) is answer.

What is the correct answer? Please explain.

Solid fuels have a higher calorific value than liquid fuels - This is an incorrect statement because liquid fuels have a higher calorific value than solid fuels.

Hence, option C is the correct answer.

Calorific value is defined as the amount of heat energy produced on complete combustion of 1 kilogram of fuel. The higher the calorific value of a fuel, the more is its efficiency. The calorific value of gaseous fuels is more. When gaseous fuel burns, it gives off a great deal of energy.

Gaseous fuels have higher calorific values because of the following reasons.

There remains no unburnt waste in gaseous fuels, unlike solid and liquid fuels.

Whether solid or liquid, combustion occurs when a volatile solid of liquid under high temperature converts to gas, so some energy is wasted to get the solid and liquid converted into gas. This loss is not there in gaseous fuels.