Fuels and Combustion With increase in the time of carbonisation at a particular temperature (say 1000°C), the __________ percentage in coke oven gas increases. Methane Unsaturated hydrocarbons Hydrogen All of these Methane Unsaturated hydrocarbons Hydrogen All of these ANSWER DOWNLOAD EXAMIANS APP
Fuels and Combustion Explosion limit of blast furnace gas is 37 to 71% gas in gas-air mixture. It means that the blast furnace gas will explode when burnt in a confined space, if its concentration in the gas-air mixture is __________ percent. < 37% In between 37 & 71% >71% None of these < 37% In between 37 & 71% >71% None of these ANSWER DOWNLOAD EXAMIANS APP
Fuels and Combustion Which of the following is not a by-product recovered in a high temperature coal carbonisation plant? Ethylene Napthalene Benzol Pitch-cresosote mixture (PCM) Ethylene Napthalene Benzol Pitch-cresosote mixture (PCM) ANSWER DOWNLOAD EXAMIANS APP
Fuels and Combustion Which of the following is a primary fuel? Wood charcoal Gasoline Natural gas Blast furnace coke Wood charcoal Gasoline Natural gas Blast furnace coke ANSWER DOWNLOAD EXAMIANS APP
Fuels and Combustion As the C/H ratio of the fuel increases, the amount of CO₂ formed on combustion __________ for the same percentage of excess air. May increase or decrease depending on the type of fuel Remains same Decreases Increases May increase or decrease depending on the type of fuel Remains same Decreases Increases ANSWER DOWNLOAD EXAMIANS APP
Fuels and Combustion Combustion of pulverised coal compared to the lumpy coal Provides better control of furnace temperature Provides higher thermal efficiency & flame temperature All of these Facilitates combustion with lower excess air Provides better control of furnace temperature Provides higher thermal efficiency & flame temperature All of these Facilitates combustion with lower excess air ANSWER DOWNLOAD EXAMIANS APP
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