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Mass Transfer

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

70
7
150
0.7

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Mass Transfer
Which of the following remains constant during evaporative cooling process with recirculated water supply?

Wet bulb temperature
Partial pressure of vapour
Relative humidity
None of these

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Mass Transfer
What is the degree of freedom of an absorption process in which only one component is transferred between phases?

3
4
1
2

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Mass Transfer
A binary mixture of benzene and cyclohexane is separated by

Extractive distillation
Solvent extraction
Flash vaporisation
Ordinary distillation

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Mass Transfer
On addition of solute in the solvent, the __________ of the solution decreases.

Both B and C
Vapour pressure
Freezing point
Boiling point

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Mass Transfer
H₂S is being absorbed in a gas absorber unit. The height of the transfer unit based on the overall mass transfer coefficient on the gas side is 0.4 m. The equilibrium data is given by, y = 1.5 x. The bulk concentration of H₂S has to be reduced from 0.05 to 0.001 mole fraction in the gas side. The height of the tower (in metres) corresponding to an operating line given by, y = 5x + 0.001 is

1.56
0.56
2
1

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