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

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

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Heat Transfer
If Prandtl number is greater than the Schmidt number, then the

none of the listed here
thermal boundary layer lies inside the concentration boundary layer
thermal & concentration boundary layers are of equal thickness
concentration boundary layer lies inside the thermal boundary layer

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