Process Equipment and Plant Design
Where does the maximum tensile strength occur in a thick cylindrical vessel subjected to internal pressure?

None of these
At the inner surface
At the outer surface
At the mid thickness of the cylindrical wall

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Process Equipment and Plant Design
Pick out the wrong statement pertaining to the comparative evaluation of performance of the packed tower and the plate tower.

In operations involving large temperature changes. (e.g. distillation), plate towers are preferred over packed towers as the packing may be crushed due to large temperature changes
Plate tower is preferred over packed tower, if the operation involves liquids containing dispersed solids
Plate tower is perferred, if interstage cooling is required to remove heats of reaction or solution
The total weight of a dry plate tower is usually much more than that of a dry packed tower designed for the same duty

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