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 pitch
None of these
Called tube clearance

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Process Equipment and Plant Design
High pressure fluid in a shell and tube heat exchanger should preferably be routed through the

Shell side for smaller total pressure drop
Shell side for large overall heat transfer co-efficient
Tubes to avoid the expansion of high pressure shell construction
Shell side, if the flow is counter-current and tube side if the flow is co-current

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