Process Equipment and Plant Design
In seive plate column, holes are drilled or punched in sizes ranging from 2.5 to 12 mm (5 mm being widely used). The hole pitch is normally __________ times the hole diameter to give the required hole area.

0.5 to 1.5
5 to 10
2.5 to 4.0
10 to 15

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

None of these
Real trays required to the number of ideal trays required
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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