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Mass Transfer

Mass Transfer
Weight of 1 m³ of humid air as compared to 1 m³ of dry air, under the same conditions, is

Same
Less
Unpredictable
More

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Mass Transfer
When the __________ the relative humidity of air decreases, despite an increase in the absolute humidity.

Temperature rises
Pressure rises
Pressure falls
Temperature falls

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Mass Transfer
The surface renewal frequency in Danckwerts model of mass transfer is given by (KL: mass transfer co-efficient)

KL².DA
√(KL².DA)
KL²/DA
KL/DA²

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Mass Transfer
Penetration theory relates the average mass transfer co-efficient (K) with diffusivity (D) as

K ∝ D
K ∝ √D
K ∝ D2
K ∝ D1.5

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Mass Transfer
Degree of freedom for leaching and solvent extraction process is

1
2
3

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Mass Transfer
Unsaturated air (with dry bulb and wet bulb temperatures being 45°C and 25°C respectively) is passed through a water spray chamber maintained at 23°C. The air will be cooled and

Humidified with wet bulb temperature decreasing
Dehumidified
Humidified at constant wet bulb temperature
None of these

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