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Process Equipment and Plant Design

Process Equipment and Plant Design
The difficulty of liquid distribution in packed towers is accentuated, when the ratio of tower diameter to packing diameter is

< 7
< 30
> 20 < 50
> 7 < 15

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Process Equipment and Plant Design
In seive plate column, holes are drilled or punched in sizes ranging from 2.5 to 12 mm (5 mm being widely used). The hole pitch is normally __________ times the hole diameter to give the required hole area.

2.5 to 4.0
5 to 10
0.5 to 1.5
10 to 15

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Process Equipment and Plant Design
In actual operation of a bubble cap distillation tower, the __________ at the bottom of the tower is more than that at the top of the tower.

Vapour molecular weight
All of these
Molal flow rate of vapour
Pressure and temperature

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Process Equipment and Plant Design
Which of the following efficiencies can be greater than 100%?

Murphree plate efficiency
Point efficiency
Overall plate efficiency
None of these

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Process Equipment and Plant Design
Value of Peclet number = 0, is the representative of

Eddy diffusivity = 0
Laminar flow
Plug flow
Complete back mixing

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Process Equipment and Plant Design
The operating velocity in the absorption tower is usually 40-50% of the flooding velocity. Packed absorption towers are normally designed for a pressure drop of about __________ mm of water column per metre height of packing.

43835
20-40
1000-1500
100-150

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