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
Calorific value of the fuel
Flame temperature achieved
Heat transfer rate to the stock in the furnace

ANSWER DOWNLOAD EXAMIANS APP

Fuels and Combustion
Fixed carbon in coal is defined as

The total quantity of carbon present in the coal
That present in volatile matters
The one which is present in the residue after combustion
Hundred minus the percentage of volatile matter, ash and moisture

ANSWER DOWNLOAD EXAMIANS APP

Fuels and Combustion
Sometimes water is sprayed during coal charging in the coke oven, which helps in

All of these
Controlling the dust nuisance while charging the coal
Prevention of clinker formation in the oven
Reducing the cracking of hydrocarbons in the gas and increasing the percentage of CO & H₂ in the gas (due to the endothermic reaction represented by C + H₂O = CO + H₂)

ANSWER DOWNLOAD EXAMIANS APP
MORE MCQ ON Fuels and Combustion