Heat Transfer
In a heat exchanger, one transfer unit means

A section of the exchanger in which change in temperature of one stream equals the average driving force in the section
None of these
The size of the exchanger in which heat transfer rate is 1 kcal/hr
Both A and B

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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

5000
6000
4000
2000

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