Very tall packed towers are divided into series of beds 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

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

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

A

Minimise the overall pressure drop

B

Avoid flooding

C

Reduce liquid hold up

D

Avoid channeling

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

Use of packed towers for distillation is generally limited to the

A

Small sizes

B

Multicomponent distillation

C

High pressure operation

D

Vacuum distillation

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

Use of raschig rings in place of crushed stones as packing in packed beds (other things being same)

A

Increases pressure drop, increases surface area

B

Increases pressure drop, decreases surface area

C

Decreases pressure drop, increases surface area

D

Decreases pressure drop, decreases surface area

Who is the tallest among six boys P, T, N, D, Q and R? 1. P is taller than D and N but not as tall as T. 2. R is taller than Q but not as tall as T. 3. Q is not taller than T and R.

A

Only 1 and 2

B

Only 2 and 3

C

All 1, 2 and 3

D

Only 1 and 3

A man 6 feet tall casts a shadow 4 feet long, at the same time a flagpole casts a shadow that is 50 feet long. How tall is the flagpole?

A

70 feet

B

75 feet

C

80 feet

D

85 feet

B is taller than A, C is as tall as B, E in not as tall as C as D is shorter than E but taller, than A, Then, which of the following is true?

A

B is the tallest of all

B

C is the tallest of all

C

B and C are the tallest of all

D

D is the shortest of all

Very tall packed towers are divided into series of beds to

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