The value of L/mG ratio for economical absorption operation ranges from

The most economical range of absorption factor is

A

0 to 0.5

B

0 to 3

C

1.25 to 2

D

5 to 15

Absorption factor, for a fixed degree of absorption from a fixed amount of gas should be

A

1

B

> 1

C

≤ 1

In a gas-liquid absorption coloumn, for obtaining the maximum absorption efficiency

A

Liquid stream should be distributed uniformly

B

Gas stream should be distributed uniformly

C

Both gas as well as liquid streams should be distributed uniformly

D

By passing should be completely avoided

Absorption accompanied with chemical reaction is exemplified by the absorption of

A

Ammonia in water

B

Benzol present in coke oven gas by wash oil

C

SO₂ in alkaline solution

D

All of the above

In the absorption of ammonia in water, the main resistance to absorption is by the __________ phase.

A

Liquid

B

Gas

C

Both A & B

D

Neither A nor B

Absorption (liquid-gas system) with evolution of heat as compared to isothermal absorption results in

A

Decreased solute solubility

B

Large minimum liquid to gas (L/G) ratio

C

Large number of trays

D

All of the above

For economical operation of a nuclear plant

A

Used fuel should be reprocessed

B

Moderator should be used

C

Coolant should be employed

D

Control rods should be used

In a continuous distillation column, the optimum reflux ratio ranges from __________ times the minimum reflux ratio.

A

1.1 to 1.5

B

1.6 to 2

C

2.2 to 2.6

D

2.7 to 3

The ratio of the depth of flow to the hydraulic radius for the most economical trapezoidal section, in open channel flow is

A

0.5

B

1

C

1.5

D

2

The ratio of width to depth for the most economical rectangular section in open channel flow is

A

0.5

B

1

C

1.5

D

2

The value of L/mG ratio for economical absorption operation ranges from

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