Heat Transfer
'Fouling factor' used in the design of a multipass shell and tube heat exchanger is a

None of these
Non-dimensional factor
Conversion factor for individual film heat transfer co-efficient to overall heat transfer co-efficient
Factor of safety

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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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