Process Equipment and Plant Design
In packed towers provided with pall rings liquid redistributors are positioned at heights of every 6 metres or 5-10 times the column diameter, whichever is less. Maximum size of the pall rings should not exceed __________ of the column diameter.

1/5-1/10th
1/10-1/15th
1/20-1/30th
1/2 to 1/4th

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Process Equipment and Plant Design
Pick out the wrong statement pertaining to the design of a long tube vertical evaporator.

Liquor level is maintained at l/3rd to 1/2 of the height of the tube
Steam is fed to the shell, whereas the liquor is filled inside the tube
None of these
Tube dia is 3-6 cms, while tube length in 3-6 metres

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Process Equipment and Plant Design
A forced circulation long tube vertical evaporator as compared to the natural circulation evaporator

Employs high velocity, high heat transfer rate and less heating surface requirement
Is economical in operation
Both B & C
Employs a centrifugal pump placed between external downtake from vapor drum and inlet to tube bundle

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Process Equipment and Plant Design
High pressure fluid in a shell and tube heat exchanger should preferably be routed through the

Shell side for smaller total pressure drop
Shell side, if the flow is counter-current and tube side if the flow is co-current
Tubes to avoid the expansion of high pressure shell construction
Shell side for large overall heat transfer co-efficient

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