Fuels and Combustion
For which pair of the fuel gases, calorific value (C.V.) of one fuel is almost double that of the other on volume basis (i.e., kcal/Nm³ ), while the C.V. is same on weight basis (i.e., kcal/kg) ?

Propane and acetylene
F. gas and coke oven gas
Propane and LPG
Sewage gas and gobar gas

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Fuels and Combustion
Beehive coke oven

Produces coke with very poor strength
Facilitates by-products recovery
Gives larger yield of coke (around 85%) as compared to by-product ovens
Takes 2-3 days for coking of coal but requires no external fuel for heating

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