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Mass Transfer

Mass Transfer
Diameter to height ratio for a rashig ring is

2
5
1
0.5

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Mass Transfer
Equilibrium-moisture curves of different solids

Depend on the humidity of the gas
Are same
Are different
None of these

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Mass Transfer
In continuous distillation, the internal reflux ratio (Ri) and the external reflux ratio (Re) are related as

Ri = Re/(1 - Re)
Ri = (1 - Re)/Re
Ri = Re/(1 + Re)
Ri = Re

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Mass Transfer
Flooding in a vapor-liquid contacting equipment occurs in a tray, when the pressure drop through a tray is __________ the liquid head available in the downcomer.

More than
Less than
Same as
Very much less

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Mass Transfer
Tower diameter may be decreased by

Increasing the liquid flow rate
Use of increased tray spacing
Increasing the vapour flow rate
Using higher reflux ratio

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Mass Transfer
The drying time between fixed moisture contents within the 'constant rate period' is proportional to (assuming that drying occurs from all surfaces of the solid) (where, T = thickness of the solid )

T
T1.5
T3
√T

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