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
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
TREE is to GROUND as CHIMNEY is to
A SMOKE
B BRICK
C SKY
D GARAGE
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
Gradually increasing temperature of flue gases at inlet to chimney for given steam outputs is an indication of
A Higher effectiveness of boiler
B High calorific value coal being burnt
C Fouling of heat transfer surfaces
D Raising of steam temperature
The draught produced by chimney of given height at given outside temperature
A decreases if the chimney gas temperature increases
B increases if the chimney gas temperature increases
C remains same irrespective of chimney gas temperature
D may increase or decrease
For forced draught system, the function of chimney is mainly
A to produce draught to accelerate the combustion of fuel
B to discharge gases high up in the atmosphere to avoid hazard
C to reduce the temperature of the hot gases discharged
D none of the above
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

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