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Mass Transfer

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

3 to 4
1.2 to 1.5
2.5 to 3
5

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Mass Transfer
The equipment frequently used for adiabatic humidification-cooling operation with recirculating liquid is

Natural draft cooling tower
Spray chamber
None of these
Induced draft cooling tower

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Mass Transfer
In a counter-current extractor, as the axial mixing increases, the extraction efficiency

Increases
Remains unchanged
Decreases
Depends on the pressure of the system

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

Density
Molal concentration
Kinematic viscosity
Velocity head

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Mass Transfer
Molality is defined as the number of gm moles of solute per __________ of solvent.

m³
Kg
Gm
Litre

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Mass Transfer
To remove all the moisture from a wet solid it requires exposure to __________ air.

None of these
High temperature
Perfectly dry
Highly humid

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