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Mass Transfer

Mass Transfer
In a solution containing 0.30 Kg mole of solute and 600 kg of solvent, the molality is

0.6
2
0.5
1

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Mass Transfer
For the same system, if the same liquid used in an absorber is decreased, the tower height will

Decrease or increase ; depends on the type of liquid
Remain unaffected
Decrease
Increase

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Mass Transfer
Low viscosity absorbent is preferred for reasons of

Rapid absorption rates and good heat transfer characteristics
Improved flooding characteristics
All of these
Low pressure drop on pumping

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Mass Transfer
An air-water vapour mixture has a dry bulb temperature of 60°C and a dew point temperature of 40°C. The total pressure is 101.3 kPa and the vapour pressure of water at 40°C and 60°C are 7.30 kPa and 19.91 kPa respectively.The humidity of air sample expressed as kg of water vapour/kg of dry air is

0.152
0.079
0.048
0.122

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Mass Transfer
In case of cooling towers, the ratio of the rates of heat and mass transfer is indicated by the __________ number.

None of these
Grashoff
Lewis
Sherwood

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Mass Transfer
The critical moisture content in case of drying indicates the __________ rate period.

Beginning of constant
Beginning of falling
End of falling
None of these

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