Process Equipment and Plant Design
The value of fouling factor depends upon the

All of these
Velocity of process fluid containing suspended solids
Characteristic of process fluid
Suspended solids in the fluid

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Process Equipment and Plant Design
Pick out the wrong statement about the design of seive plate column and the bubble cap column.

The downcomer design and the residence time in the downcomer is almost same for seive plate and bubble cap columns
Weir length for a bubble cap plate is the same as that for the seive plate
Weir height in case of a bubble cap plate ranges from 50 to 150 mm and is higher than the seive plate
Weir height for a bubble cap plate column is the same as that for a seive plate column

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Process Equipment and Plant Design
For a cylindrical shell, (subject to the thickness of uppermost course being more than the minimum for diaofthe tank in question), the thickness of the courses of shell

Decreases upwards
May decrease or increase upwards depending upon whether vacuum or positive pressure would be maintained inside the shell
Increases upwards
Remains same throughout

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Process Equipment and Plant Design
Bubble cap tray is the most commonly used tray in large distillation column, because

It eliminates the foaming and entrain-ment tendency during operation
Of its flexibility and nearly constant efficiency under varying conditions of operation
None of these
It incurs less pressure drop as compared to any other try designed for the same duty

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