For forced draught system, the function of chimney is mainly

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

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 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 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 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

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

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

For forced draught system, the function of chimney is mainly

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