For identical operating conditions, the pressure drop over __________ tray is the highest out of the following.

Flooding in a vapor-liquid contacting equipment occurs in a tray, when the pressure drop through a tray is __________ the liquid head available in the downcomer.

A

Less than

B

More than

C

Same as

D

Very much less

Bubble cap tray is the most commonly used tray in large distillation column, because

A

Of its flexibility and nearly constant efficiency under varying conditions of operation

B

It incurs less pressure drop as compared to any other try designed for the same duty

C

It eliminates the foaming and entrain-ment tendency during operation

D

None of these

A rectangular sheet of paper, 10 cm long and 8 cm wide has squares of side 2 cm cut from each of its corner. The sheet is then folded to form a tray of depth 2cm. What is the volume of this tray?

A

32cm3

B

48cm3

C

49cm3

D

54cm3

Pressure drop per tray in the atmospheric distillation column is about __________ psi.

A

0.01 - 0.5

B

0.07 - 0.12

C

0.5 - 1.0

D

1 - 3

Applying a pressure drop across a capillary results in a volumetric flow rate 'Q' under laminar flow conditions. The flow rate for the same pressure drop, in a capillary of the same length but half the radius is

A

$$\frac{{\text{Q}}}{2}$$

B

$$\frac{{\text{Q}}}{4}$$

C

$$\frac{{\text{Q}}}{8}$$

D

$$\frac{{\text{Q}}}{{16}}$$

Out of the following gas-liquid contacting devices, for a given set of operating conditions, gas pressure drop is the least in __________ tower.

A

Wetted wall

B

Bubble cap

C

Perforated tray

D

Packed

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

Maximum acceptable total liquid gradient over a tray is about __________ mm.

A

5.5

B

12.5

C

30.5

D

45.5

The operating pressure drop range in a bag filter is about __________ mm water gauge.

A

50-150

B

5-10

C

500-1500

D

1500-2500

Liquid gradient over the tray results due to the

A

Resistance offered to flow of liquids by caps & risers and the flow of gas

B

Low gas velocity

C

Large plate spacing

D

Large reflux ratio

For identical operating conditions, the pressure drop over __________ tray is the highest out of the following.

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