Q31 of 269 Page 123

Calorific value and ignition temperature of fuel X are 75 kJ/g and 200C respectively. These values for fuel Y are 50 kJ/g and 750C respectively. On burning, the fuel Y produces only CO2 while fuel X produces CO2 and CO. Which of the two is a better fuel? Give two reasons to support your answer.

Fuel Y is a better fuel due to the following main reasons:

(i) Y has a moderate ignition temperature of 75°C


(ii) As it do not produce any harmful gas (like CO) while burning.


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29

Which of the following is not a fossil fuel?

 30

The calorific values of three fuels A, B and C are 33 KJ/g, 150 KJ/g, respectively. A is solid, B is liquid and C is a gas at room temperature. On combustion, both A and B produces carbon dioxide while C explodes forming steam. B and C leave no residue after combustion while A leaves behind some solid residue. Which one of the three fuels is the most ideal? Give two reasons to support your answer.

 32

The calorific values of five fuels A, B, C, D and E are given below:

(A) 48 kJ/g


(B) 17 kJ/g


(C) 150 kJ/g


(D) 50 kJ/g


(E) 30kJ/g


Which of the fuels could be: (i) cooking gas (ii) alcohol (iii) wood (iv) hydrogen (v) kerosene ?

 33

Arrange the following fuels in the order of decreasing calorific values (keeping the fuels with highest calorific value first):

Biogas, Kerosene, Wood, Petrol, Hydrogen gas, Methane