Process Equipment and Plant Design
Fouling factor must be included in the calculation of over all design heat transfer coefficient, when the liquid

Is of high specific gravity
Containing suspended solids flows at high velocity
Is highly viscous
Containing suspended solids flows at low velocity

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Process Equipment and Plant Design
Overall tray efficiency of a distillation column is the ratio of the number of

Ideal trays required to the number of real trays required
Overall gas transfer units to the number of ideal trays required
None of these
Real trays required to the number of ideal trays required

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