Heat Transfer
Which is the best tube arrangement (in a shell and tube heat exchanger) if the fluids are clean and non-fouling?

Triangular pitch
Square pitch
None of these
Diagonal square pitch

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

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

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