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
__________ fuels require the maximum percentage of 'excess air' for complete combustion.
A Solid
B Liquid
C Gaseous
D Nuclear
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
During combustion of gaseous fuels, deficiency of air
A does not affect the flame length
B increases the flame temperature
C tends to shorten the flame
D lengthens the flame
Sooty and sulphurous smog formed due to combustion of fossil fuels particularly in winter, continues throughout the day and night. When the moist atmospheric air's water vapor condenses on the solid particles of smoke thereby forming smog (smoke + fog), it causes
A Poor visibility due to sky darkening
B Irritation in eyes
C Respiratory trouble
D All of the above
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)
Supply of excess air for complete combustion of fuel is necessitated to facilitate
A Its thorough mixing with air
B Attainment of chemical equilibrium
C Attainment of high temperature
D None of these
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 excess air required for the combustion of pulverised coal is of the order of about __________ percent.
A 5
B 15
C 30
D 45
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

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