Heat Transfer
Leidenfrost point is a term concerned with the

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

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Heat Transfer
LMTD for counterflow and prallel flow heat exchanger will be the same, when the

Outlent temperature of both the hot and cold fluid are same
None of these
Cold fluid is heated to a certain temperature by condensing steam (isothermal fluid)
Outlet temperature of hot fluid is less than the outlet temperature of the cold fluid

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