Natural draft created by the chimney depends upon

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

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 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

The main advantage of forced draft over natural draft is that

A

Combustion of fuel is complete

B

Smaller height chimney can be used

C

Furnace control is easier

D

All of the above

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 rate of heat transfer from a vertical plate by natural convection depends upon the temperature differences (ΔT) between wall and outside bulk. The proportionality is given as

A

$${\left( {\Delta {\text{T}}} \right)^{\frac{1}{4}}}$$

B

$${\left( {\Delta {\text{T}}} \right)^{\frac{1}{2}}}$$

C

$${\left( {\Delta {\text{T}}} \right)^{\frac{5}{4}}}$$

D

$${\left( {\Delta {\text{T}}} \right)^{\frac{3}{4}}}$$

Which of the following is a natural draft furnace?

A

Blast furnace stoves

B

Power plant boilers

C

Sintering furnace

D

None of these

A natural draft cooling tower is filled with wooden grids, which covers about __________ percent of the tower height.

A

10-15

B

30-40

C

70-80

D

90-100

Natural draft created by the chimney depends upon

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