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

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

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Process Equipment and Plant Design
In case of design of a shell and tube heat exchanger,

All of these
Minimum cleaning lane of 6.5 mm is provided, when tubes are on a square pitch
O.D. of the tube is 6 to 40 mm while the tube lengths used are 0.5, 2.5, 3.0, 4.0, 5.0, 6 metres
Minimum tube sheet thickness (in which tubes are fixed) is equal to the O.D. of the tube upto 15 mm tube diameter; and for > 15 mm tube diameter, tube sheet thickness is smaller than tube diameter

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