The correct order of fuels mentioned below in increasing order of calorific value is:
CNG, Petrol, Cow Dung Cake and Wood.
Cow Dung Cake < Wood < Petrol < CNG.
The correct order of fuels in increasing order is:
Cow Dung Cake < Wood < Petrol < CNG.
FuelCalorificValue(kJ/kg)Cow dung cake6000−8000Wood17000−22000Coal25000−33000Petrol, Kerosene, Diesel45000Methane, CNG50000Biogas35000−40000Hydrogen150000