Fuels and Combustion Archives

Coke oven gas is a better fuel than blast furnace gas, because of its higher________________?

Coke oven gas is a better fuel than blast furnace gas, because of its higher________________?

A. Calorific value, cleanliness and relatively low distribution cost (due to its low specific gravity)
B. Adiabatic flame temperature
C. Heat release rate (thus requiring smaller combustion chamber)
D. All A., B. and C.

Coke oven gas is a better fuel than blast furnace gas, because of its higher________________? Read More »

Fuels and Combustion

Which of the following is not a micro component present in coal ?

Fuels and Combustion / admin

Which of the following is not a micro component present in coal ?

A. Micrinite
B. Clarain
C. Fusinite
D. Liptinite

Which of the following is not a micro component present in coal ? Read More »

Fuels and Combustion

Which of the following would require maximum amount of % excess air for complete combustion ?

Fuels and Combustion / admin

Which of the following would require maximum amount of % excess air for complete combustion ?

A. Coke oven gas
B. Furnace oil
C. Pulverised coal
D. Lump coal (fixed on chain grate)

Which of the following would require maximum amount of % excess air for complete combustion ? Read More »

Fuels and Combustion

Coking time in a commercial high temperature coal carbonisation plant is about ______________ hours?

Fuels and Combustion / admin

Coking time in a commercial high temperature coal carbonisation plant is about ______________ hours?

A. 6
B. 18
C. 28
D. 36

Coking time in a commercial high temperature coal carbonisation plant is about ______________ hours? Read More »

Fuels and Combustion

With increase in C/H ratio of a fuel, the dew point of flue gases______________________?

Fuels and Combustion / admin

With increase in C/H ratio of a fuel, the dew point of flue gases______________________?

A. Increases
B. Decreases
C. Remain same
D. May increase or decrease; depends on the type of fuel

With increase in C/H ratio of a fuel, the dew point of flue gases______________________? Read More »

Fuels and Combustion

High temperature carbonisation of coal takes place at _______________ °C?

Fuels and Combustion / admin

High temperature carbonisation of coal takes place at _______________ °C?

A. 2000
B. 600
C. 1100
D. 1600

High temperature carbonisation of coal takes place at _______________ °C? Read More »

Fuels and Combustion

When the coal is heated in absence of air, it is called its ________________?

Fuels and Combustion / admin

When the coal is heated in absence of air, it is called its ________________?

A. Deoxidation
B. Gasification
C. Coalification
D. Carbonisation

When the coal is heated in absence of air, it is called its ________________? Read More »

Fuels and Combustion

Out of the following fuels, the difference between gross and net calorific value will be minimum in case of___________________?

Fuels and Combustion / admin

Out of the following fuels, the difference between gross and net calorific value will be minimum in case of___________________?

A. Coke oven gas
B. Water gas
C. Natural gas
D. Blast furnace gas

Out of the following fuels, the difference between gross and net calorific value will be minimum in case of___________________? Read More »

Fuels and Combustion

A good quality coal should have ___________________?

Fuels and Combustion / admin

A good quality coal should have ___________________?

A. Low fusion point of ash
B. High ash content
C. High sulphur
D. None of these

A good quality coal should have ___________________? Read More »

Fuels and Combustion

Shatter index of metallurgical coke on 2 inches and 0.5 inch screen should be respectively around _______________ percent?

Fuels and Combustion / admin

Shatter index of metallurgical coke on 2 inches and 0.5 inch screen should be respectively around _______________ percent?

A. 80 and 97
B. 95 and 100
C. 40 and 70
D. 25 and 97

Shatter index of metallurgical coke on 2 inches and 0.5 inch screen should be respectively around _______________ percent? Read More »

Fuels and Combustion