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Calorific Value and Efficiency of a Fuel

Which fuel gi...

Question

Which fuel gives off the maximum heat when 1 kg of it is burnt? What is this amount of heat called?

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Solution

Hydrogen gives off the maximum heat when 1 kg of it is burnt. Amount of heat produced when 1 kg of fuel is burnt is called its calorific value. Unit of calorific value is kilojoule per kilogram(kJ/kg)

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Q. The amount of heat liberated when one kilogram of a fuel is completely burnt in sufficient supply of oxygen is called __________ __________ of the fuel.

Q. The amount of heat energy released when a fuel burns completely is called calorific value.

Fill in the following blanks with suitable words :

(a) A fuel must be heated to its___ before it starts burning.

(b) The most common supporter of combustion around us is___

(c) Fire produced by burning oil cannot be controlled by___

(d) A liquid fuel used in homes is___

(e) The amount of heat evolved when 1 kg of a fuel is burnt completely is called its___

(f) The substances which vaporise during burning, give___

(g) Burning of wood and coal causes___ of air.

Q. Calorific value of a fuel is the heat energy produced when
(a) any amount of the fuel is completely burnt.
(b) one kilogram of the fuel is completely burnt.
(c) one milligram of the fuel is completely burnt.
(d) hundred grams of the fuel are completely burnt.

m o l

of methanol when burnt in excess of

O_{2}

723 k J

1 m o l

O_{2}

is used what will be the amount of heat evolved:

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Calorific Value and Efficiency of a Fuel

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