For maximum discharge through a chimney, its height should be

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

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 maximum discharge through a chimney, the condition is that height of hot gas column producing the draught should be

A

One-half the height of chimney

B

Equal to the height of chimney

C

Two times the height of chimney

D

Four times the height of 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

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

Flue gas discharge velocity through chimney of a big thermal power plant may be around __________ m/sec.

A

0.5

B

500

C

10

D

50

The discharge over the trapezoidal notch is equal to the discharge over the rectangular notch __________ the discharge over the triangular notch.

A

Plus

B

Minus

C

Divide

D

None of these

The discharge through a convergent mouthpiece is __________ the discharge through an internal mouthpiece of the same diameter and head of water.

A

Equal to

B

One-half

C

Three fourth

D

Double

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

Stack (chimney) height in a big thermal power plant is dictated by the

A

Pollution control aspect

B

Draught to be created

C

Limitation of constructional facilities

D

None of these

For maximum discharge through a chimney, its height should be

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