Related Questions

Use of excess of combustion air in the combustion of fuels results in
A Heat losses
B Long flame
C Condensation of water vapour from the fuel gas
D None of these
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
The main drawback of supplying more excess air in the combustion of fuel is the
A Excessive power requirement of air blower
B Enhanced sensible heat loss in the flue gas
C Intermittant and uncontrolled combustion of the fuel
D High exit flue gas temperature from the furnace
The optimum percentage of excess air for combustion depends upon the __________ of the fuel.
A Type (solid, liquid or gaseous)
B Calorific value
C Sulphur content
D Ignition temperature
Deficiency of combustion air during combustion of a gaseous fuel
A Lengthens the flame
B Causes heat loss of fuel by its partial combustion
C Both A & B
D Shortens the flame
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)
__________ fuels require the maximum percentage of 'excess air' for complete combustion.
A Solid
B Liquid
C Gaseous
D Nuclear
Air/fuel ratio by weight for combustion of methane with theoretical quantity of air will be about
A 9:1
B 17 : 1
C 23 : 1
D 29 : 1
Air/fuel ratio on molar (volume) basis for combustion of methane with theoretical quantity of air with be
A 9.5:1
B 12.5:1
C 15.5 :1
D 18.5 : 1
Too much of excess air in combustion results in high
A Fuel consumption for the same heat load
B Stack gas temperature
C Percentage of oxygen in flue gases
D All of the above

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