Heat Transfer
Multiple effect evaporation accounts for

Steam economy
Lower operating costs
None of these
Investment economy

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Heat Transfer
In a laboratory test run, the rate of drying was found to be 0.5 x 10-3 kg/m².s, when the moisture content reduced from 0.4 to 0.1 on dry basis. The critical moisture content of the material is 0.08 on a dry basis. A tray dryer is used to dry 100 kg (dry basis) of the same material under identical conditions. The surface area of the material is 0.04 m²/kg of dry solid. The time required (in seconds) to reduce the moisture content of the solids from 0.3 to 0.2 (dry basis) is

4000
5000
2000
6000

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Heat Transfer
Leidenfrost point is a term concerned with the

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

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