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Mass Transfer

Mass Transfer
If Rm is the minimum reflux ratio, the optimum reflux ratio may be around __________ Rm.

2.5 to 3
1.2 to 1.5
3 to 4
5

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Mass Transfer
Calculation of mass transfer co-efficient is mostly/normally done using __________ theory.

Film
Surface renewal
Penetration
None of the listed here

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Mass Transfer
Air initially at 101. 3 kPa and 40°C and with a relative humidity of 50%, is cooled at constant pressure to 30°C. The cooled air has a

Higher wet bulb temperature
Higher dew point
Higher relative humidity
Higher absolute (specific) humidity

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Mass Transfer
In a packed bed absorption column, the channelling will be noted by the

Increase in flow rate
Sharp rise in pressure drop
Sharp drop in pressure drop
None of these

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

K ∝ D1.5
K ∝ D
K ∝ √D
K ∝ D2

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Mass Transfer
When the temperature and humidity of air is low, we usually use __________ draft cooling tower.

Induced
Forced
None of these
Natural

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