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

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

A

25-50

B

50-75

C

200-250

D

750-1000

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

Pressure difference between two points in vessels, pipelines or in two different pipelines can be measured by a differential manometer. The pressure difference measured as the mm of water coloumn in case of mercury-water, differential manometer is equal to (where, H = difference in height of mercury column in mm).

A

H

B

12.6 H

C

13.6 H

D

14.6 H

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

Maximum size of the raschig rings used in a packed tower is about __________ of the coloumn diameter.

A

$${\frac{1}{{10}}^{{\text{th}}}}$$

B

$${\frac{1}{{20}}^{{\text{th}}}}$$

C

$${\frac{1}{{30}}^{{\text{th}}}}$$

D

$${\frac{1}{{50}}^{{\text{th}}}}$$

Working principle of manometer comprises of balancing a coloumn of liquid against the pressure to be measured. Inclined tube manometer is especially used for the measurement of __________ pressure.

A

Small differential

B

Atmospheric

C

Absolute

D

Gage

Minimum possible diameter of a packed coloumn is decided mainly by the

A

Flooding

B

Gas viscosity

C

Liquid density

D

Liquid hold up

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

If T and R are the tread and rise of a stair which carries a load w per square metre on slope, the corresponding load per square metre of the horizontal area, is

A

$$\frac{{{\text{w}}\left( {{\text{R}} + {\text{T}}} \right)}}{{\text{T}}}$$

B

$$\frac{{{\text{w}}\sqrt {{{\text{R}}^2} + {{\text{T}}^2}} }}{{\text{T}}}$$

C

$$\frac{{{\text{w}}\sqrt {{\text{R}} + {\text{T}}} }}{{\text{T}}}$$

D

$${\text{w}}\frac{{\text{R}}}{{\text{T}}}$$

The practical representative values of HETP for a number of commercial operations lies within a range of __________ metre.

A

0.1-0.2

B

0.2-0.5

C

0.4-0.9

D

1.2-1.5

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

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