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Mass Transfer

Mass Transfer
NSc/NPr is called the

Sherwood number
Psychrometric ratio
Lewis number
Stantan number

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Mass Transfer
When an unsaturated air-water mixture is heated at constant pressure, then

The specific humidity decreases
The relative humidity increases
The relative humidity decreases
The partial pressure of water vapour increases

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Mass Transfer
Paper industry employs __________ driers.

Spray
Fluidised bed
Cylinder
Rotary

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Mass Transfer
In gas-liquid contact operation, the number of ideal stages, N = (xa - xb)/(xb - x*b) . This is true when the stripping factor 'S' is

S > 1
S = 1
S = ∞
S < 1

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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
2
0.56
1

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Mass Transfer
During dehumidification of unsaturated air wet bulb temperature & partial pressure of vapor are not constant. However, during evaporative cooling process with recirculated water supply, the __________ remains constant.

Wet bulb temperature
Relative humidity
None of these
Partial pressure of water vapor

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