Fuels and Combustion Temperature of preheated air used for the transportation of pulverised coal through pipes to the burner of a boiler furnace is restricted to a maximum limit of about 300° C to avoid the Incomplete combustion of coal Requirement of large volume combustion chamber Risk of explosion Chances of clinker formation Incomplete combustion of coal Requirement of large volume combustion chamber Risk of explosion Chances of clinker formation ANSWER DOWNLOAD EXAMIANS APP
Fuels and Combustion Combustion reaction of fuels is a/an __________ reaction. None of these Exothermic Auto catalytic Endothermic None of these Exothermic Auto catalytic Endothermic ANSWER DOWNLOAD EXAMIANS APP
Fuels and Combustion Which of the following is not increased by using preheated combustion air in place of ordinary air at room temperature? Speed of combustion of fuel Flame temperature achieved Calorific value of the fuel Heat transfer rate to the stock in the furnace Speed of combustion of fuel Flame temperature achieved Calorific value of the fuel Heat transfer rate to the stock in the furnace ANSWER DOWNLOAD EXAMIANS APP
Fuels and Combustion During coal carbonisation process, the conversion of semi-coke to coke is accompanied by an increase in the __________ of the mass. Porosity Density Electrical resistivity None of these Porosity Density Electrical resistivity None of these ANSWER DOWNLOAD EXAMIANS APP
Fuels and Combustion The calorific value of natural gas is about __________ kcal/Nm³. 2500 35, 000 10, 000 25, 000 2500 35, 000 10, 000 25, 000 ANSWER DOWNLOAD EXAMIANS APP
Fuels and Combustion High sulphur content in a fuel __________ of the flue gases. Reduces the combustion efficiency by limiting the permissible temperature reduction Increases the dew point Both B & C Decreases the dew point Reduces the combustion efficiency by limiting the permissible temperature reduction Increases the dew point Both B & C Decreases the dew point ANSWER DOWNLOAD EXAMIANS APP
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