Q.

Which of the following fuels has the lowest calorific value?


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a

LPG

b

Coal

c

Dung cakes

d

Diesel 

answer is C.

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Detailed Solution

Dung cakes have the lowest calorific value.
The calorific value of food or fuel is the amount of heat energy present that is determined by the complete combustion of a specified quantity at constant pressure and under normal conditions.  The amount of heat released by the combustion of one kilogram of a substance is referred to as its calorific value. The calorific values of the given fuels are as follows:
Dung cakes - 7 kJ/g
Coal - 33 kJ/g
Alcohol - 30 kJ/g
Diesel - 45 kJ/g
LPG- 55 kJ/
Hence, dung cakes have the lowest calorific value.
 
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