Process Equipment and Plant Design
In a multipass shell and tube heat exchanger, the problem of differential expansion between the shell and tube passes is taken care of by using a

Either A or B
Neither A nor B
U-bend
Floating head tube sheet

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

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

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