In packed absorption tower, onset of flooding usually occurs at a pressure drop of about __________ mm of water column per metre height of packing.

At the following point for a given packing and set of fluids, the pressure drop per metre of packed height, with variation in fluid rates and operating pressure

A

Increases

B

Decreases

C

Remains same

D

May increase or decrease depending upon the solubility of the gas in the liquid

Commercial packed scrubbers are normally designed for a pressure drop range of __________ mm water coloumn per metre of packed height.

A

4-8

B

17-34

C

52-68

D

88-105

At the same gas flow rate, the pressure drop in a packed tower being irrigated with liquid __________ that in dry packed tower.

A

Is greater than

B

Is lower than

C

Is same as

D

Cannot be predicted as data are insufficient

In an absorption coloumn, the flooding velocity for random packing is __________ that for stacked/regular packing.

A

Greater than

B

Smaller than

C

Equal to

D

Either A, or B ; depends on the type of packing

In a moderately sized packed absorption tower, channeling (which is most severe with stacked packings) can be minimised by taking the ratio of tower diameter to packing diameter

A

> 4 :1

B

> 8:1

Under conditions of flooding in packed tower, the gas pressure drop

A

Decreases rapidly

B

Increases rapidly

C

Remains constant

D

Is maximum

Operating velocity in a packed tower is usually __________ the flooding velocity.

A

Half

B

Twice

C

Equal to

D

More than

Kelly and Chris packed several boxes with books. If Chris packed 60 percent of the total number of boxes, what was the ratio of the number of boxes Kelly packed to the number of boxes Chris packed?

A

1 to 6

B

1 to 4

C

2 to 5

D

2 to 3

Pressure drop through plate tower as compared to that through packed tower, for the same duty will be

A

Less

B

More

C

Equal

D

Either A or B; depends on the packing height

Which of the following factors affect the pressure drop in a co-current gas-liquid absorption packed tower?

A

Size, shape, orientation and surface of the packing particles

B

Density and viscosity of fluids

C

Fluid flow rates

D

All of the above

In packed absorption tower, onset of flooding usually occurs at a pressure drop of about __________ mm of water column per metre height of packing.

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