Q.

Which one of the following gases has the highest calorific value?

A. Natural gas
B. Water gas
C. Coal gas
D. Indane gas
Answer» D. Indane gas
Explanation: The basic calorific value for solid and liquid fuels is the gross calorific value at constant volume and for gaseous fuels it is the gross calorific value at constant pressure. The calorific value in Kcal/Kg: Coal: 4000-700Q; Natural gas: 8600; Coal gas: 4000; Water gas: 4600-4800; and LPG (liquefied petroleum gas such as Indane): 11,900 Kcal/Kg.
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