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Mass Transfer

Mass Transfer
Boiling point diagram is not affected by the ambient

Temperature
Pressure
Humidity
Both B and C

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Mass Transfer
Prandtl number for water at 20°C is about

150
70
7
0.7

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Mass Transfer
Cox chart, which is useful in the design of distillation column particularly for petroleum hydrocarbons, is a plot of (where, P = vapor pressure, T = temperature)

P vs . log T
Log P vs. log T
T vs . P
Log P vs . T

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Mass Transfer
In case of __________ distillation, a solvent is added to alter the relative volatility of the mixture to be separated.

Flash
Molecular
Azeotropic
Extractive

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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

0.079
0.152
0.048
0.122

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

Highly humid
Perfectly dry
High temperature
None of these

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