Heat Transfer
LMTD can't be used as such without a correction factor for the

Condensation of mixed vapour in a condenser
All of these
Baffled heat exchanger
Multipass heat exchanger

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Heat Transfer
1000 Kg of liquid at 30°C in a well stirred vessel has to be heated to 120°C, using immersed coils carrying condensing steam at 150°C. The area of the steam coils is 1.2 m² and the overall heat transfer co-efficient to the liquid is 1500 W/m².°C. Assuming negligible heat loss to the surrounding and specific heat capacity of the liquid to be 4 kJ/kg.°C, the time taken for the liquid to reach desired temperature will be

22 min
51 min
15 min
44 min

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Heat Transfer
Leidenfrost point is a term concerned with the

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

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