Process Equipment and Plant Design
Shortest distance between two tubes is

None of these
More in case of triangular pitch as compared to square pitch of tube layout
Called tube pitch
Called tube clearance

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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

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

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