Fuels and Combustion Froth floatation is used for All of these Removing ash from the coal based on difference in specific gravity of coal and ash Washing lump coal (> 80 mm size) Washing fine coal dust (< 0.5 mm size) All of these Removing ash from the coal based on difference in specific gravity of coal and ash Washing lump coal (> 80 mm size) Washing fine coal dust (< 0.5 mm size) ANSWER DOWNLOAD EXAMIANS APP
Fuels and Combustion The maximum adiabatic flame temperature in air as compared to that in pure oxygen is Either lower or higher, depends on the type of fuel Same Much higher Much lower Either lower or higher, depends on the type of fuel Same Much higher Much lower ANSWER DOWNLOAD EXAMIANS APP
Fuels and Combustion With increase in the time of carbonisation at a particular temperature (say 1000°C), the __________ percentage in coke oven gas increases. Hydrogen Methane Unsaturated hydrocarbons All of these Hydrogen Methane Unsaturated hydrocarbons All of these ANSWER DOWNLOAD EXAMIANS APP
Fuels and Combustion The heat of combustion of a fuel Can't be known without calculating it Is always positive Is always negative Is equal to the heat of formation Can't be known without calculating it Is always positive Is always negative Is equal to the heat of formation ANSWER DOWNLOAD EXAMIANS APP
Fuels and Combustion Yield of charcoal in high temperature carbonisation of wood is about __________ percent. 25 50 10 75 25 50 10 75 ANSWER DOWNLOAD EXAMIANS APP
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) Calorific value, cleanliness and relatively low distribution cost (due to its low specific gravity) Adiabatic flame temperature All of these Heat release rate (thus requiring smaller combustion chamber) Calorific value, cleanliness and relatively low distribution cost (due to its low specific gravity) Adiabatic flame temperature All of these ANSWER DOWNLOAD EXAMIANS APP
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