Fuels and Combustion With increase in the temperature of carbonisation of coal All of these Methane content in the coke oven gas decreases and carbon monoxide content increases Calorific value of the coke oven gas decreases due to cracking of hydrocarbons which is not compensated by increase in CO & H? content Hydrogen content of coke oven gas increases due to cracking of hydrocarbons All of these Methane content in the coke oven gas decreases and carbon monoxide content increases Calorific value of the coke oven gas decreases due to cracking of hydrocarbons which is not compensated by increase in CO & H? content Hydrogen content of coke oven gas increases due to cracking of hydrocarbons ANSWER DOWNLOAD EXAMIANS APP
Fuels and Combustion Coking time in beehive coke oven is about One week 2-3 days 12 hours Two weeks One week 2-3 days 12 hours Two weeks ANSWER DOWNLOAD EXAMIANS APP
Fuels and Combustion High rate of heating of coke ovens Produces larger size coke Increases the time of carbonisation May damage its walls due to abrupt excessive swelling of coal None of these Produces larger size coke Increases the time of carbonisation May damage its walls due to abrupt excessive swelling of coal None of these ANSWER DOWNLOAD EXAMIANS APP
Fuels and Combustion Overfire burning in a furnace is a phenomenon characterised by the Burning of carbon monoxide and other incombustibles in upper zone of furnace by supplying more air None of these Supply of excess air Supply of excess fuel Burning of carbon monoxide and other incombustibles in upper zone of furnace by supplying more air None of these Supply of excess air Supply of excess fuel ANSWER DOWNLOAD EXAMIANS APP
Fuels and Combustion The heat of combustion of a fuel Is always positive Can't be known without calculating it Is equal to the heat of formation Is always negative Is always positive Can't be known without calculating it Is equal to the heat of formation Is always negative ANSWER DOWNLOAD EXAMIANS APP
Fuels and Combustion Correct viscosity of furnace oil at the burner tip for proper atomisation is about 25 centistokes. To reduce the viscosity of high viscosity furnace oil (250 centistokes) to the correct atomisation viscosity (i.e. 25 cst), it should be preheated to about____°C. 85 105 145 70 85 105 145 70 ANSWER DOWNLOAD EXAMIANS APP
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