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 The hydrocarbons crack thereby choking and fouling the heat transfer surface by carbon soot It reduces its flame temperature tremendously It reduces its calorific value tremendously There are chances of explosion during preheating The hydrocarbons crack thereby choking and fouling the heat transfer surface by carbon soot It reduces its flame temperature tremendously ANSWER DOWNLOAD EXAMIANS APP
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 Chances of clinker formation Risk of explosion Incomplete combustion of coal Requirement of large volume combustion chamber Chances of clinker formation Risk of explosion Incomplete combustion of coal Requirement of large volume combustion chamber ANSWER DOWNLOAD EXAMIANS APP
Fuels and Combustion High amount of sulphur and phosphorous in coke causes None of these Increase in its strength Decrease in its calorific value Brittleness of steel made by using it None of these Increase in its strength Decrease in its calorific value Brittleness of steel made by using it ANSWER DOWNLOAD EXAMIANS APP
Fuels and Combustion Which of the following will generate maximum volume of product of complete combustion (Nm³/Nm³ of fuel) ? Blast furnace gas Carburetted water gas Producers Natural gas Blast furnace gas Carburetted water gas Producers Natural gas ANSWER DOWNLOAD EXAMIANS APP
Fuels and Combustion Which of the following fuel gases will require maximum amount of air for combustion of 1 Nm³ gas ? Blast furnace gas Natural gas Water gas Producer gas Blast furnace gas Natural gas Water gas Producer gas ANSWER DOWNLOAD EXAMIANS APP
Fuels and Combustion With increase in the oxygen content of the coal, its __________ decreases. Calorific value Caking power Both A & B Neither A nor B Calorific value Caking power Both A & B Neither A nor B ANSWER DOWNLOAD EXAMIANS APP
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