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Mass Transfer

Mass Transfer
Mechanism of moisture removal in case of freeze drying of food stuff is by

Dehydration
Sublimation
Adsorption
Evaporation

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Mass Transfer
At minimum reflux ratio for a given separation

Minimum number of the theoretical plates is required
Number of plates is infinity
Separation is most efficient
Number of plates is zero

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Mass Transfer
The percentage humidity is less than the relative humidity only at __________ percent humidity.

Zero
None of these
Hundred
Both zero and hundred

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Mass Transfer
A mixture of 10% C₆H₆ vapour in air at 25°C and 750 mm Hg has a dew point of 20°C. Its dew point at 30°C and 700 mm Hg will be around __________ °C.

27.3
21.7
20
18.7

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Mass Transfer
At what percentage (by volume) of alcohol composition, it forms an azeotrope with water?

99
95
91.5
90

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Mass Transfer
The dew point of a saturated gas phase equals the __________ temperature.

None of these
Gas
Room
Wet bulb

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