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Mass Transfer

Mass Transfer
Mass transfer co-efficient varies as DAB0.5, according to the __________ theory.

None of these
Penetration
Surface renewal
Film

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Mass Transfer
The most economical range of absorption factor is

1.25 to 2
2.5 to 3
5 to 10
2 to 2.5

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Mass Transfer
For achieving rapid drying rate in a spray dryer, the diameter of the particles in the feed should be in the range of __________ microns (1 mm = 1000 microns).

22190
200-300
43835
> 500

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Mass Transfer
Reboiler is considered as one theoretical plate, because

Reboiler itself contains one plate
Vapour is recycled to the column
None of these
Of the assumption that vapour and liquid leaving the reboiler are in equilibrium

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Mass Transfer
Can a cooling tower cool water below the wet bulb temperature of inlet air?

Yes ; but the air flow rate should be excessively high
No
Yes ; but height of cooling tower will be prohibitively high
Yes

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Mass Transfer
The absorption factor is defined as (where, L = liquid flow rate, G = gas flow rate and, m = slope of the equilibrium line)

L/mG
LG/m
ML/G
G/mL

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