Fuels and Combustion The bright glow of a combustion process is the characteristic of __________ temperature oxidation of coal. Slow & low Fast & slow Fast & high Slow & high Slow & low Fast & slow Fast & high Slow & high ANSWER DOWNLOAD EXAMIANS APP
Fuels and Combustion Largest constituent of blast furnace gas is N₂ CO₂ CO H₂ N₂ CO₂ CO H₂ ANSWER DOWNLOAD EXAMIANS APP
Fuels and Combustion The ratio of maximum adiabatic flame temperature in air to that in pure oxygen is always > 1 1 Unpredicatable > 1 1 Unpredicatable ANSWER DOWNLOAD EXAMIANS APP
Fuels and Combustion For long flame and easy ignition, the coal used should have High calorific value Low ash High ash High volatile matter High calorific value Low ash High ash High volatile matter ANSWER DOWNLOAD EXAMIANS APP
Fuels and Combustion Ratio of primary air to secondary air increases with increase in the rank of coal, because the Oxygen content progressively decreases Ratio of fixed carbon to volatile matter increases Calorific value of the coal increases High rank coals have higher amount of volatile matter Oxygen content progressively decreases Ratio of fixed carbon to volatile matter increases Calorific value of the coal increases High rank coals have higher amount of volatile matter ANSWER DOWNLOAD EXAMIANS APP
Fuels and Combustion Fuel gases containing hydrocarbons (ie.g. coke oven gas) are not preheated before burning, mainly because It reduces its flame temperature tremendously There are chances of explosion during preheating It reduces its calorific value tremendously The hydrocarbons crack thereby choking and fouling the heat transfer surface by carbon soot It reduces its flame temperature tremendously There are chances of explosion during preheating It reduces its calorific value tremendously The hydrocarbons crack thereby choking and fouling the heat transfer surface by carbon soot ANSWER DOWNLOAD EXAMIANS APP
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