Fuels and Combustion
During combustion of a gaseous fuel, the presence of a non-luminous flame is an indication of the

Incomplete combustion
None of these
Complete combustion
High oxygen in flue gas

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Fuels and Combustion
Coke oven gas is a better fuel than blast furnace gas, because of its higher

Heat release rate (thus requiring smaller combustion chamber)
Adiabatic flame temperature
All of these
Calorific value, cleanliness and relatively low distribution cost (due to its low specific gravity)

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