Related Questions

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
Which furnace employs an I.D. fan for the removal of flue gases from the furnace?
A Coke oven
B Blast furnace stoves
C Beehive coke oven
D High pressure boiler
A _________ in a boiler is used to put off fire in the furnace of the boiler when the level of water in the boiler falls to an unsafe limit.
A Blow off cock
B Fusible plug
C Stop valve
D Safety valve
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
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
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
A device used to put off fire in the furnace of the boiler when the level of water in the boiler falls to an unsafe limit, is called
A Blow off cock
B Stop valve
C Superheater
D None of these
The predominant mode of heat transfer which takes place from boiler furnace to water walls of a boiler is
A Conduction
B Convection
C Both A & B
D Radiation

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