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

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

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Fuels and Combustion
With increase in the temperature of carbonisation of coal

Hydrogen content of coke oven gas increases due to cracking of hydrocarbons
Methane content in the coke oven gas decreases and carbon monoxide content increases
Calorific value of the coke oven gas decreases due to cracking of hydrocarbons which is not compensated by increase in CO & H? content
All of these

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