Fuels and Combustion Fuel gases containing hydrocarbons (ie.g. coke oven gas) are not preheated before burning, mainly because It reduces its calorific value tremendously There are chances of explosion during preheating It reduces its flame temperature tremendously The hydrocarbons crack thereby choking and fouling the heat transfer surface by carbon soot It reduces its calorific value tremendously There are chances of explosion during preheating It reduces its flame temperature tremendously The hydrocarbons crack thereby choking and fouling the heat transfer surface by carbon soot ANSWER DOWNLOAD EXAMIANS APP
Fuels and Combustion In low temperature carbonisation of coal as compared to high temperature carbonisation __________ produced is less. Yield of ammonia present in coke oven gas Yield percentage of coke Free carbon content in tar Difference in gross & net calorific value of the coke oven gas Yield of ammonia present in coke oven gas Yield percentage of coke Free carbon content in tar Difference in gross & net calorific value of the coke oven gas ANSWER DOWNLOAD EXAMIANS APP
Fuels and Combustion A particular coal is said to be free burning when it Shows little or no fusing action Gives smokeless burning None of these Burns completely Shows little or no fusing action Gives smokeless burning None of these Burns completely ANSWER DOWNLOAD EXAMIANS APP
Fuels and Combustion As the equilibrium moisture content of the coal increases, its Calorific value increases Bulk density decreases Swelling number increases Swelling number decreases Calorific value increases Bulk density decreases Swelling number increases Swelling number decreases ANSWER DOWNLOAD EXAMIANS APP
Fuels and Combustion Rate of low temperature oxidation of coal due to bad storage conditions Does not vary with increase in surface area Is more for low volatile coal compared to high volatile coal Decreases with increase in surface area Is accelerated by storage in large heaps with small surface to volume ratio Does not vary with increase in surface area Is more for low volatile coal compared to high volatile coal Decreases with increase in surface area Is accelerated by storage in large heaps with small surface to volume ratio ANSWER DOWNLOAD EXAMIANS APP
Fuels and Combustion Soft coke is not A domestic fuel None of these Used in blast furnaces Produced by low temperature carbonisation of coal A domestic fuel None of these Used in blast furnaces Produced by low temperature carbonisation of coal ANSWER DOWNLOAD EXAMIANS APP
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