Question

The calorific value of a fuel is expressed in a unit called

• A. $\mathrm{kilojoule}\mathrm{per}\mathrm{litre}$
• B. $\mathrm{kilogram}\mathrm{per}\mathrm{millilitre}$
• C. $\mathrm{kilojoule}\mathrm{per}\mathrm{gram}$
• D. $\mathrm{kilojoule}\mathrm{per}\mathrm{kilogram}$

Answer 1

The correct option is D

$\mathrm{kilojoule}\mathrm{per}\mathrm{kilogram}$

Option D: $\mathrm{kilojoule}\mathrm{per}\mathrm{kilogram}$

1. Calorific value is the amount of energy released or produced when 1 kg of fuel or any other substance is burnt in the presence of oxygen.
2. The products of combustion are cooled to STP.
3. Hence, hydrogen has the highest calorific value.
4. The heat value of a fuel is the amount of heat released during its combustion.
5. Also referred to as energy or calorific value.
6. The efficiency of fuel or food mainly depends on the calorific value.
7. If the value is high, its efficiency will also be high.
8. If the value is low, its efficiency would also decrease.
9. Calorific value is directly proportional to its efficiency.

Therefore the calorific value of a fuel is expressed in a unit called $\mathrm{kilojoule}\mathrm{per}\mathrm{kilogram}.$

Hence the correct answer is option D.