Fuels and Combustion Presence of free moisture in coal during its high temperature carbonisation Reduces the coking time Protects the volatile products from pyrolysis (cracking) in the presence of hot coke and hot oven walls Increases the loss of fine coal dust from the ovens when charging None of these Reduces the coking time Protects the volatile products from pyrolysis (cracking) in the presence of hot coke and hot oven walls Increases the loss of fine coal dust from the ovens when charging None of these ANSWER DOWNLOAD EXAMIANS APP
Fuels and Combustion Presence of phosphorous in metallurgical coal Reduces its calorific value Is not undersirable Increases its caking power Badly affects the quality of steel Reduces its calorific value Is not undersirable Increases its caking power Badly affects the quality of steel ANSWER DOWNLOAD EXAMIANS APP
Fuels and Combustion Which of the following has the least calorific value (kcal/Nm³) ? Coke oven gas Blast furnace gas Sewage gas Natural gas Coke oven gas Blast furnace gas Sewage gas Natural gas ANSWER DOWNLOAD EXAMIANS APP
Fuels and Combustion Low temperature carbonisation Produces higher quantity of gas than high temperature carbonisation Is mainly for producing the smokeless domestic coke Produces less quantity of tar than high temperature carbonisation Is meant for the production of 'metallurgical coke' Produces higher quantity of gas than high temperature carbonisation Is mainly for producing the smokeless domestic coke Produces less quantity of tar than high temperature carbonisation Is meant for the production of 'metallurgical coke' ANSWER DOWNLOAD EXAMIANS APP
Fuels and Combustion Which of the following combustibles is absent in blast furnace gas? CO None of these CH₄ H₂ CO None of these CH₄ H₂ ANSWER DOWNLOAD EXAMIANS APP
Fuels and Combustion Nitrogen in coal Comes from protein in parent vegetable matter Is recovered as ammonia during its carbonisation Is present upto 1-2% All of these Comes from protein in parent vegetable matter Is recovered as ammonia during its carbonisation Is present upto 1-2% All of these ANSWER DOWNLOAD EXAMIANS APP
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