Question

Among the following fuels, which has the least calorific value:

CNG, Petrol, Cow Dung Cake, Wood.

• A. Cow dung cake
• B. Wood
• C. Petrol
• D. CNG

Answer 1

The correct option is A Cow dung cake

Calorific value is the amount of heat liberated by combustion of one kilogram of a substance.
$$\begin{array}{cc}\text{Fuel}& \text{Calorific value (KJ/Kg)}\\ \text{Cow dung cake}& \text{7000}\\ \text{Wood}& \text{18000}\\ \text{Petrol}& \text{45000}\\ \text{CNG}& \text{50000}\end{array}$$
Among these, the fuel with the least calorific value is cow dung cake.