Fuels and Combustion Archives

Coal is heated in absence of air for 7 minutes at a temperature of about ______________ °C, during its volatile matter determination for proximate analysis?

Coal is heated in absence of air for 7 minutes at a temperature of about ______________ °C, during its volatile matter determination for proximate analysis?

A. 550
B. 750
C. 950
D. 1150

Coal is heated in absence of air for 7 minutes at a temperature of about ______________ °C, during its volatile matter determination for proximate analysis? Read More »

Fuels and Combustion

Lurgi gasifier (high pressure gasifier) as compared to Kopper Totzek gasifier (atmospheric pressure gasifier) produces __________________?

Fuels and Combustion / admin

Lurgi gasifier (high pressure gasifier) as compared to Kopper Totzek gasifier (atmospheric pressure gasifier) produces __________________?

A. Higher amount of methane
B. Lower amount of hydrogen
C. Both A. and B.
D. Higher amount of both methane and hydrogen

Lurgi gasifier (high pressure gasifier) as compared to Kopper Totzek gasifier (atmospheric pressure gasifier) produces __________________? Read More »

Fuels and Combustion

Yield of blast furnace gas is about _______________ Nm3 /ton of pig iron?

Fuels and Combustion / admin

Yield of blast furnace gas is about _______________ Nm3 /ton of pig iron?

A. 300
B. 2000
C. 5000
D. 10000

Yield of blast furnace gas is about _______________ Nm3 /ton of pig iron? Read More »

Fuels and Combustion

Emission of dense white smoke out of the chimney of a thermal power plant is an indication of the use of__________________?

Fuels and Combustion / admin

Emission of dense white smoke out of the chimney of a thermal power plant is an indication of the use of__________________?

A. Less air for combustion
B. Correct amount of air for combustion
C. Too much air for combustion
D. Pulverised coal in boilers

Emission of dense white smoke out of the chimney of a thermal power plant is an indication of the use of__________________? Read More »

Fuels and Combustion

Which of the following is a rich fuel gas ?

Fuels and Combustion / admin

Which of the following is a rich fuel gas ?

A. Producer gas
B. Coal gas from underground gasification of coal
C. Refinery gases
D. None of these

Which of the following is a rich fuel gas ? Read More »

Fuels and Combustion

With increases in carbonisation temperature_______________________?

Fuels and Combustion / admin

With increases in carbonisation temperature_______________________?

A. Coke even gas yield increases
B. Tar yield increases
C. Hydrogen percentage in the coke oven gas decreases
D. Methane percentage in the coke oven gas increases

With increases in carbonisation temperature_______________________? Read More »

Fuels and Combustion

64-132) rank coal (ASTM) means a coal with 64%___________________?

Fuels and Combustion / admin

64-132) rank coal (ASTM) means a coal with 64%___________________?

A. Fixed carbon and having a heating value around 13, 200 BTU/1b
B. Ash and heating value around 13, 200 BTU/1b
C. Fixed carbon and heating value around 132 BTU/1b
D. None of these

64-132) rank coal (ASTM) means a coal with 64%___________________? Read More »

Fuels and Combustion

A liquid/gaseous fuel containing hydrocarbons and high amount of sulphur is burnt with 40% excess air. The flue gas still contains large amount of carbon monoxide. This may be due to the_________________?

Fuels and Combustion / admin

A liquid/gaseous fuel containing hydrocarbons and high amount of sulphur is burnt with 40% excess air. The flue gas still contains large amount of carbon monoxide. This may be due to the_________________?

A. Presence of large quantity of hydrogen in the fuel
B. Low calorific value of the fuel
C. High sulphur content in the fuel
D. Lack of thorough mixing of fuel with air

Fuels and Combustion