The main reason for dividing a tall packed tower into series of small towers is to

The reason for preferring packed towers over plate towers in distillation practice is that the packed tower operation gives

A

Low pressure drop and high hold up

B

High pressure drop and low hold up

C

Low pressure drop and low hold up

D

High pressure drop and high hold up

Plate towers are preferred to packed towers, when large temperature changes are involved, because of the reason that the

A

Packing may be crushed due to thermal expansion/contraction of the components of the equipments

B

Pressure drop in the equipment will be very high

C

Viscosity variation of the fluids may cause channeling/flooding

D

None of these

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

Very tall packed towers are divided into series of beds to

A

Reduce the overall pressure drop

B

Avoid channelling

C

Reduce liquid hold-up

D

Avoid flooding

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

The difficulty of liquid distribution in packed towers is accentuated, when the ratio of tower diameter to packing diameter is

A

[

A.

B.

B

> 7

C

> 20

The correct combination of the following groups of sentences "The boy climbed up to the top of the tower. The tower was steep and tall. The boy was my younger brother. There was none other" would be --

A

The boy having climbed up to the top, steep tower was my younger brother

B

The boy who climbed up to the top, steep tower was my younger brother

C

The boy who climbed up to the tall tower all alone was my younger brother

D

The boy climbing the top, steep tower was my younger brother

A packed tower compared to a plate tower for a particular mass transfer operation

A

Incurs smaller pressure drop

B

Allows installation of cooling coils

C

Is less costly when built in large sizes/diameters

D

Is more suitable, if suspended solids are present in fluid streams

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

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

The main reason for dividing a tall packed tower into series of small towers is to

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