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
For the same draught produced the power of induced draught fan as compared to forced draught fan is
A less
B more
C same
D not predictable
Power required in case of forced draught as compared to induced draught (for the same draught produced) is
A Same
B Less
C More
D Either more or less; depends on the flue gas density
The air pressure at the fuel bed is reduced below that of atmosphere by means of a fan placed at or near the bottom of the chimney to produce a draught. Such a draught is called
A Natural draught
B Induced draught
C Forced draught
D Balanced draught
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
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 velocity of flue gases (V) through the chimney under a static draught of (H') metres is given by
A $${\text{V}} = \sqrt {2{\text{gH}}'} $$
B $${\text{V}} = \sqrt {\frac{{2{\text{g}}}}{{{\text{H}}'}}} $$
C $${\text{V}} = \frac{{{\text{H}}'}}{{\sqrt {2{\text{g}}} }}$$
D $${\text{V}} = 2{\text{g}}\sqrt {{\text{H}}'} $$
Natural draught produced by a chimney depends upon the
A Density of the chimney gases
B Height of the chimney
C Both A & B
D Neither A nor B
The draught produced by a steam jet issuing from a nozzle placed in the chimney is called
A Induced steam jet draught
B Chimney draught
C Forced steam jet draught
D None of these

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