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Mass Transfer

Mass Transfer
According to the film theory of mass transfer, the mass transfer co-efficient is proportional to (where, D = molecular diffusivity)

D2
D
1/D
D0.5

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Mass Transfer
The wet and 'dry bulb temperature for a vapour-gas mixture are 25°C and 30°C respectively. If the mixture is heated to 45°C at constant pressure, the wet bulb temperature will be __________ °C.

-25
< 25
> 25
25

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Mass Transfer
Antibiotics are best handled in a

Rotating disc contactor
Sieve tray contractor
Podbielniak extractor
Pulsed column extractor

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Mass Transfer
During constant rate period, the rate of drying decreases with the

Both A & B
Neither A nor B
Decrease in air temperature
Increase in air humidity

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Mass Transfer
With increase in the concentration of the adsorbate, the integral heat of adsorption

Decreases
Increases
Remains unchanged
May increase or decrease ; depends on the type of adsorbate

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Mass Transfer
The value of L/mG ratio for economical absorption operation ranges from

1.25 to 2.0
2.5 to 3.5
0.5 to 0.8
0.8 to 1.2

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