Q7 of 87 Page 105

Which of the following fuels has the lowest calorific value?

Coal has the lowest calorific value. Coal contains moisture. When coal burns the moisture in coal evaporates taking away some heat of combustion which is not available for our use.


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5

Name one substance which undergoes spontaneous combustion(or burns in air at room temperature).

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Name the unit in which the calorific value is expressed.

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Which of the following fuels has the highest calorific value?

Diesel, Methane, CNG, Coal, Petrol

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Name the term which is used to express the efficiency of a fuel.