Heat Transfer
A concentric double pipe heat exchanger as compared to the shell and tube heat exchanger for the same heat load requires

Lower maintenance cost
Less heating surface
More space
None of these

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Heat Transfer
In sub-cooled boiling,

Very large vapour space is necessary
Bubbles from heating surface are absorbed by the mass of the liquid
Temperature of the heating surface is less than the boiling point of the liquid
Temperature of the heating surface is more than the boiling point of the liquid

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Heat Transfer
Leidenfrost point is a term concerned with the

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

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