Related Questions

Thermal conductivity based continuous flue gas analyser makes use of varying thermal conductivity of the constituents of flue gases. Which of the following constituents of flue gases has the maximum thermal conductivity?
A CO2
B N2
C O2
D CO
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
When incomplete combustion loss is high, the flue gas analysis shows large amount of
A CO2
B CO
C O2
D C
Flue gas obtained on complete combustion of pure acetylene (a hydrocarbon fuel) will contain
A CO
B CO2
C H2O
D Both B & C
The ratio of the energy required to produce the artificial draught (expressed in meters head or J/kg of flue gas) to the mechanical equivalent of extra heat carried away per kg of flue gases due to natural draught, is known as
A Efficiency of the boiler
B Efficiency of the chimney
C Efficiency of the fan
D Power of the boiler
__________ the exhaust gas is an indication of the incomplete combustion of fuel.
A Low temperature of
B High temperature of
C High % of CO in
D High % of CO2 in
If oxygen content in the flue gas rises too high, fuel is being wasted by
A Incomplete combustion
B Dry gas/stack gas loss
C Moisture loss
D None of these
Oxygen percentage in the flue gas coming out of a gaseous fuel fired furnace should be ideally about __________ percent.
A [

A.

B.

High sulphur content in a fuel __________ of the flue gases.
A Decreases the dew point
B Increases the dew point
C Reduces the combustion efficiency by limiting the permissible temperature reduction
D Both B & C
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

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