Fuels and Combustion
A fuel with high heat release rate will

Have high adiabatic flame temperature
None of these
Require smaller combustion chamber
Have high calorific value

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Fuels and Combustion
A sample of natural gas containing 80% methane (CH₄) and rest nitrogen (N₂) is burnt with 20% excess air. With 80% of the combustibles producing CO₂ and the reminder going to CO, the Orsat analysis in volume percent is

CO₂ : 6.26, CO : 1.56, O₂ : 3.91, H₂O :15.66, N₂ : 72.60
CO₂ : 6.39, CO : 1.60, O₂ : 3.99, H₂O:25.96, N₂:72.06
CO₂ : 7.60, CO : 1.90, O₂ : 4.75, N₂ : 85.74
CO₂ : 7.42, CO : 1.86, O₂ : 4.64, N₂:86.02

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

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

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