A. % of CO2 in
B. % of O2in
C. Temperature of
D. Colour of
Related Mcqs:
- Incomplete combustion of fuel in the furnace is judged by high _____________ of the flue gases?
A. CO content
B. Dew point
C. CO2 content
D. O2 content - Incomplete combustion of a fuel is characterised by the high _______________ in the flue gas?
A. Smoke
B. Temperature
C. Oxygen
D. Carbon monoxide - Flue gas obtained on complete combustion of pure acetylene (a hydrocarbon fuel) will contain __________________?
A. CO
B. CO2
C. H2O
D. Both B. & C. - Oxygen content in a flue gas was found to be 4%. It implies that excess air used for combustion was around ______________ percent?
A. 4
B. 96
C. 20
D. 40 - For the case of a fuel gas undergoing combustion with air, if the air/fuel ratio is increased, the adiabatic flame temperature will_____________________?
A. Increase
B. Decrease
C. Increase or decrease depending on the fuel type
D. Not change - When incomplete combustion loss is high, the flue gas analysis shows large amount of ________________?
A. CO2
B. CO
C. O2
D. C - Explosion limit of blast furnace gas is 37 to 71% gas in gas-air mixture. It means that the blast furnace gas will explode when burnt in a confined space, if its concentration in the gas-air mixture is _______________ percent?
A. 71%
C. In between 37 & 71%
D. None of these - Higher fuel combustion efficiency cannot be achieved by_________________?
A. Preheating of fuel gases & combustion air
B. Reducing sulphur content in the fuel
C. Adopting proper fuel firing technique & fuel preparation
D. Supplying correct amount of combustion air - Higher efficiency in the combustion of solid fuel cannot be achieved by________________?
A. Proper fuel preparation
B. Keeping the flue gas exhaust temperature very high
C. Adopting efficient-fuel firing technique & equipment
D. Supplying correct quantity of combustion air - 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
