Heat Transfer
In a shell and tube heat exchanger, the tube side heat transfer co-efficient just at the entrance of the tube is

Infinity
Zero
Same as average heat transfer co-efficient for tube side
None of these

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Heat Transfer
Nusselt number is the ratio of the

Heat flux at the wall to that across the entire pipe
None of these
Temperature gradient of the wall to that across the entire pipe
Temperature difference to the temperature gradient at the wall

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