Use of natural draft cooling tower is practised, when the air has low

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

When the temperature and humidity of air is low, we usually use __________ draft cooling tower.

A

Natural

B

Forced

C

Induced

D

None of these

Noise produced by cooling fans (employed in air cooled heat exchangers or cooling tower) is mainly caused due to the turbulence created by blade passage through air. It can be reduced by use of a slower fan

A

With greater number of blades

B

Of increased diameter

C

Both A & B

D

Neither A nor B

Minimum temperature upto which water can be theoretically cooled down in the cooling tower by evaporative cooling is equal to the __________ temperature of air.

A

Wet bulb

B

Dry bulb

C

Saturation

D

Dew point

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

In actual operation of a bubble cap distillation tower, the __________ at the bottom of the tower is more than that at the top of the tower.

A

Molal flow rate of vapour

B

Vapour molecular weight

C

Pressure and temperature

D

All of the above

The cooling effect in a cooling tower can not be increased by

A

Increasing the air velocity over the wet surfaces

B

Reducing the humidity of entering air

C

Lowering the barometric pressure

D

None of these

The term "cooling range" in a cooling tower refers to the difference in the temperature of

A

Cold water leaving the tower and the wet bulb temperature of the surrounding air

B

Hot water entering the tower and the wet bulb temperature of the surrounding air

C

Hot water entering the tower and the cooled water leaving the tower

D

None of these

The cooling effect in a cooling tower can be speeded up by

A

Increasing the air velocity and area of exposed wet surface

B

Reducing the barometric pressure

C

Reducing the humidity of the air

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

Use of natural draft cooling tower is practised, when the air has low

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