Related Questions

Draught produced by a tall chimney due to density difference between hot flue gas inside the Chimney and atmospheric air outside the chimney is more appropriately known as the __________ draught.
A Natural
B Induced
C Forced
D Chimney
Black smoke coming out of the chimney of a furnace is an indication of the use of __________ in the furnace.
A Low amount of excess combustion air
B Large quantity of excess combustion air
C Hydrocarbon fuel
D Pulverised coal as fuel
White smoke coming out of the chimney of a furnace indicates the use of
A Low excess air
B Very high excess air
C Gaseous fuel in the furnace
D Liquid fuel in the furnace
White flue gas (resembling steam) coming out of the chimney of a thermal power plant indicates that the fuel used in the boiler furnace is
A Tar
B Coke oven gas
C Pitch
D Pulverised coke
The draught produced by steel chimney as compared to that produced by brick chimney for the same height is
A Less
B More
C Same
D May be more or less
The draught produced, for a given height of the chimney and given mean temperature of chimney gases
A decreases with increase in outside air temperature
B increases with increase in outside air temperature
C remains the same irrespective of outside air temperature
D may increase or decrease with increase in outside air temperature
The maximum discharge through a chimney occurs when the height of chimney is
A Infinitely long
B Around 200 meters
C Equal to the height of the hot gas column producing draught
D Outside temperature is very low
Flue gas discharge velocity through chimney of a big thermal power plant may be around __________ m/sec.
A 0.5
B 500
C 10
D 50
Stack (chimney) height in a big thermal power plant is dictated by the
A Pollution control aspect
B Draught to be created
C Limitation of constructional facilities
D None of these
Smoke density of the flue gas going out of the chimney is measured by a
A Polarograph
B Thermal conductivity meter
C Photo electric cell
D Chromatograph

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