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Mass Transfer

Mass Transfer
Diameter to height ratio for a rashig ring is

0.5
2
5
1

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Mass Transfer
The reason for preferring packed towers over plate towers in distillation practice is that the packed tower operation gives

Low pressure drop and high hold up
High pressure drop and high hold up
High pressure drop and low hold up
Low pressure drop and low hold up

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Mass Transfer
Mass transfer co-efficient of liquid is

Not affected by the temperature
Affected more by temperature than that for gases
None of these
Affected much less by temperature than that for gases

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Mass Transfer
At the same gas flow rate, the pressure drop in a packed tower being irrigated with liquid __________ that in dry packed tower.

Cannot be predicted as data are insufficient
Is lower than
Is greater than
Is same as

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Mass Transfer
Equilibrium-moisture curves of different solids

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

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Mass Transfer
The dimension of diffusivity is same as that of the

Kinematic viscosity
Density
Velocity head
Molal concentration

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