Process Equipment and Plant Design
In a shell and tube heat exchanger, the 'tube pitch' is defined as the

Shortest distance between two adj acent tube holes
O.D. of the tube for square pitch
None of these
Shortest centre to centre distance between adjacent tubes

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Process Equipment and Plant Design
The LMTD correction factor (FT) is defined as the

Geometric mean of the true temperature difference and the LMTD
Ratio of LMTD to the true temperature difference
Differenced of true temperature difference and the LMTD
Ratio of true temperature difference to the LMTD

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