Heat Transfer
Which characteristic of a fluid is not important in deciding its route in a shell and tube heat exchanger?

Fouling characteristic
None of these
Viscosity
Corrosiveness

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Heat Transfer
Vacuum is generally maintained in the vapour space of an evaporator mainly to

Achieve very high concentration of the final product
Concentrate heat sensitive materials
Facilitate forward feeding in multiple effect evaporation
Get economical temperature difference by using moderate pressure steam

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