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

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

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Heat Transfer
Leidenfrost point is a term concerned with the

Concentration of a corrosive solution by evaporation
Boiling of a liquid on a hot surface
Condensation of the saturated vapor on a cold surface
Heat transfer between two highly viscous liquids

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