Process Equipment and Plant Design
An adequate clearance between the tray and the shell wall of a distillation column is provided to

None of these
Allow for thermal expansion and facilitate installation
Drain the liquid from the tray when the unit is not in operation
Avoid back-trapping

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

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

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Process Equipment and Plant Design
Mc Cable Thiele method used for finding theoretical stages in a distillation column assumes that the

All of these
Liquid/vapor loading across the column remains constant
Trouton's rule is applicable
Sensible heat differences are small, because the temperature changes from tray to tray is small

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