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 pitch
Always less than the diameter of the tube
Called tube clearance

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Process Equipment and Plant Design
Pick out the wrong statement pertaining to the design of a basket type evaporator.

There is no central downtake
Downtake is formed by the annular space between the bundle and the shell
The tube bundle is suspended on bracket
It is used for high viscosity liquor having large rate of scaling

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