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Mass Transfer

Mass Transfer
The dew point of a saturated gas phase equals the __________ temperature.

None of these
Gas
Room
Wet bulb

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Mass Transfer
Lewis number (Le) is

Sc x Pr
Pr x St
Sh x Pr
St x Sh

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Mass Transfer
Which of the following assumes constant molal vaporisation and overflow?

Ponchan-Savarit method
Plate absorption column
McCabe-Thiele method
Enthalpy concentration method

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Mass Transfer
Which one of the following devices is not used for both the absorption as well as the liquid-liquid extraction processes?

Packed towers
Plate towers
Wetted wall columns
Spray towers

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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
0.56
1.56
2

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Mass Transfer
In liquid extraction, if the selectivity is unity, then

Solvent flow rate should be very low
No separation will occur
Separation of the constituents is the most effective
Amount of solvent required will be minimum

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