Process Equipment and Plant Design
In a shell and tube heat exchanger, the shortest centre to centre distance between the adjacent tubes is

Always less than the diameter of the tube
Called tube clearance
Called tube pitch
None of these

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Process Equipment and Plant Design
Vertical condenser is advantageous to the horizontal condenser from operation point of view, when

Both the functions of condensation & sub cooling are carried out in a single unit
Only the function of condensation is to be carried out
Sub cooling of condensate is desired
Hydrostatic head is required for refluxing the condensate

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