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Study the following table:  Fuel   Calorific value  State  Ignition temp. A High Solid High B Moderate Gas High C Moderate Gas Moderate D Low liquid Low Which is best suited as domestic fuel?

Study the following table:  Fuel   Calorific value  State  Ignition temp. A High Solid High B Moderate Gas High C Moderate Gas Moderate D Low liquid Low Which is best suited as domestic fuel? Correct Answer C

Concept:

  • Calorific value is the amount of heat energy present in food or fuel and which is determined by the complete combustion of specified quantity at constant pressure and in normal conditions.
  • It is also called calorific power.
  • The unit of calorific value is kilojoule per kilogram i.e. KJ/Kg.
  • The efficiency of fuel or food mainly depends on the calorific value.
  • If the value is high, its efficiency will also be high. If the value is low, its efficiency would also decrease.

Explanation:

  • A good fuel is one which is readily available, cheap, burns easily in the air at a moderate rate, and produces a large amount of heat.
  • The efficiency of the fuel is measured by its calorific value.
  • As per given condition,

Fuel should have moderate calorific value, in gaseous state and moderate ignition temperature.

Additional Information

Given the table shows the calorific value of some fuels:

Fuel

Calorific Value

(kJ/kg)
Cow dung cake 6000 - 8000
Wood 17,000 - 22,000
Coal 25,000 - 33,000
Petrol 45,000
Kerosene 45,000
Deisel 45,000
Methane 50,000
CNG 50,000
LPG 55,000
Biogas 35,000 - 40,000
Hydrogen 1,50,000

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