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Question

The calorific values of petrol and CNG are 45000kJkg-1 and 50000kJkg-1, respectively. If you have a vehicle which can run on petrol as well as CNG, which fuel will you prefer and why?


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Solution

CNG would be preferable:-

  • The calorific value of a fuel can be defined as the amount of heat produced during the complete combustion of a given amount of substance at STP.
  • This calorific value is directly proportional to the efficiency of the fuel.
  • That is more the calorific value is more will be the efficiency of the fuel.
  • So from the above data, we can see that the calorific value of CNG is 50000kJkg-1 which is more than the calorific value of petrol which is 45000kJkg-1.
  • Thus the efficiency of the CNG gas would be better than that of petrol.
  • Also, the CNG would produce less pollution than petrol and is more economical as well.

Therefore, CNG would be preferable.


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