Process Equipment and Plant Design
Which of the following factors determine the amount of entrainment in a distillation column?

Plate spacing
Vapour velocity in the volume between the plates
Depth of liquid above the bubble cap slots
All of these

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Process Equipment and Plant Design
In a double pipe (concentric) heat exchanger, the hydraulic radius for heat transfer (for a fluid flowing through the annulus) would be

More than that for fluid flow
D₂ - D₁ (D₁ and D₂ are I.D. of inner and outer pipes respectively)
Less than that for fluid flow
Same as that for fluid flow

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