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

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

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Process Equipment and Plant Design
A head comprises of straight flange section, corner torus, section and central dished section. Crown radius and knuckle radius in a head is related respectively to the

Corner torus section and central dished section
Straight flange section and corner torus section
Central dished section and corner torus section
Central dished section and straight flange section

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