Heat Transfer
Shell side pressure drop in a shell and tube heat exchanger does not depend upon the

Baffle spacing & shell diameter
Tube diameter & pitch
None of these
Viscosity, density & mass velocity of shell side fluid

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Heat Transfer
The advantage of backward feed multiple effect evaporators over forward feed units is that

There is no additional cost of pumping
Most concentrated liquid is at highest temperature
Heat sensitive material can be handled
Equal heat transfer co-efficients exist in various effects

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