Related Questions

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
In a furnace employing forced draught as compared to induced draught,
A Air is sucked in, so air leaks are more and hence the furnace efficiency is reduced
B The fan operates hot and hence blades are liable to corrosion and erosion
C Positive pressure exists in the furnace
D None of these
The capacity of induced draft fan compared to forced draft fan in a boiler is
A Same
B More
C Less
D Less or more depending on size of boiler
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
A balanced draught boiler furnace employs __________ draught fan.
A Induced
B Forced
C Both A & B
D Neither A nor B
For the induced draught the fan is located
A near bottom of chimney
B near bottom of furnace
C at the top of the chimney
D anywhere permissible
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
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
Artificial draught produced by a fan can be controlled by the
A Speed of the fan
B Damper
C Variation in the pitch of the fan blades
D All of the above
Artificial draught produced by a fan in the furnace can be controlled by the
A Speed of the fan
B Damper
C Variation in the pitch of fan blades
D All of the above

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