Process Equipment and Plant Design
Stage efficiency for packed tower varies with the

All of these
Fluid rates and fluid properties
Type & size of packing
Operating pressure and column diameter

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

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

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Process Equipment and Plant Design
When one of the fluids is highly corrosive and has fouling tendency, it should

Flow at a very slow velocity
Preferably flow inside the tube for its easier internal cleaning
Flow outside the tube, when the flow is counter-current and inside the tube when the flow is co-current
Perferably flow outside the tube

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