Q.

Gross and net calorific value of fuel will be the same:


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a

if its ash content is zero

b

under no circumstances

c

if its carbon content is very low

d

if its hydrogen/hydrogen compound content is zero 

answer is D.

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Detailed Solution

        When a unit quantity of fuel is completely burned, the amount of heat produced is known as the gross or high heating value.
        The net, or lower, value is calculated and is equal to the gross calorific value less any moisture in the fuel and the latent heat of the water vapour produced during the burning of hydrogen.
        If a fuel contains no hydrogen compounds, its gross and net calorific value will be the same.
 
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