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Mass Transfer

Mass Transfer
Molality is defined as the number of gm moles of solute per __________ of solvent.

Litre
Gm
m³
Kg

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Mass Transfer
The drying time between fixed moisture content within diffusion controlled 'falling rate period' is proportional to (assuming that drying occurs from all surfaces of the solid) (where, T = thickness of the solid )

T
√T
T³
T²

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Mass Transfer
Leaching rate is independent of the

None of the listed here
Temperature
Agitation
Particle size

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Mass Transfer
During constant rate period, the rate of drying decreases with the

Increase in air humidity
Both A & B
Decrease in air temperature
Neither A nor B

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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
0.048
0.122
0.152

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Mass Transfer
Separation of __________ employs gaseous diffusion process.

Isotopes of uranium
SO₂ and air
Isotopes of helium
N₂ and O₂ from air

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