What do you understand by calorific value? Arrange the following fuels in their ascending order of calorific value : hydrogen, methane, cow dung cake, kerosene, wood. [3 MARKS]

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Solution

Calorific Value : 1 Marks
Correct Order : 2 Mark

The amount of heat evolved (in Joules) when a certain quantity (1 Kg) of fuel undergoes combustion is called its calorific value.

cow dung cake < wood < kerosene < methane < hydrogen
$\begin{matrix} Fuel & Calorific Value (kJ/kg) Cow dung cake & 6000 - 8000 Wood & 17000 - 22000 Coal & 25000 - 33000 Petrol, Kerosene, Diesel & 45000 Methane, CNG & 50000 Biogas & 35000 - 40000 Hydrogen & 150000 \end{matrix}$

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Which of the following fuels has the highest calorific value ?

Kerosene, Wood, Hydrogen, Cow-dung cakes, LPG

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