Fuels and Combustion Which of the following will be unsuitable for dust cleaning from flue gas at 400°C from a pulverised coal fired boiler ? Bag filter Wet scrubber Hydrocyclones Multicyclones Bag filter Wet scrubber Hydrocyclones Multicyclones ANSWER DOWNLOAD EXAMIANS APP
Fuels and Combustion The calorific value of a gas of composition CO₂ = 20%, H₂ = 50%, CH₄ = 30%, is y. If the composition of gas is changed to H₂ = 50%, CH₄ = 30%, CO₂ = 10%, N₂ = 10%, then the calorifice value will be 0.95 y 1.8 y Y 1.05 y 0.95 y 1.8 y Y 1.05 y ANSWER DOWNLOAD EXAMIANS APP
Fuels and Combustion During the carbonisation of coal Evolution of H₂ and formation of methane and aromatics occur at > 700°C All of these Hard semi-coke starts shrinking at 600°C All tar is evolved at < 600°C Evolution of H₂ and formation of methane and aromatics occur at > 700°C All of these Hard semi-coke starts shrinking at 600°C All tar is evolved at < 600°C ANSWER DOWNLOAD EXAMIANS APP
Fuels and Combustion With increase in the temperature of carbonisation of coal Methane content in the coke oven gas decreases and carbon monoxide content increases All of these Hydrogen content of coke oven gas increases due to cracking of hydrocarbons Calorific value of the coke oven gas decreases due to cracking of hydrocarbons which is not compensated by increase in CO & H? content Methane content in the coke oven gas decreases and carbon monoxide content increases All of these Hydrogen content of coke oven gas increases due to cracking of hydrocarbons Calorific value of the coke oven gas decreases due to cracking of hydrocarbons which is not compensated by increase in CO & H? content ANSWER DOWNLOAD EXAMIANS APP
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) 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) ANSWER DOWNLOAD EXAMIANS APP
Fuels and Combustion Main constituents of benzol are Ammonia & phenol Benzene, toluene & xylene Tar & creosote Anthracene & phenol Ammonia & phenol Benzene, toluene & xylene Tar & creosote Anthracene & phenol ANSWER DOWNLOAD EXAMIANS APP
EXAMIANS