Question

What do you understand by fuel efficiency?

Answer 1

Fuel efficiency:

• Fuel efficiency is expressed in terms of its calorific value which is expressed in units of kilojoule per kg.
• The amount of heat energy produced on the complete combustion of $1\mathrm{kg}$ of a fuel is called its calorific value.
• The calorific value of a fuel is expressed in a unit called kilojoule per kg $(\mathrm{kJ}/\mathrm{kg})$.

Example:

• The calorific value of Coal is $25000-33000\mathrm{kJ}/\mathrm{kg}$.