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Mass Transfer

Mass Transfer
Free flowing granular materials can be best dried in a __________ drier.

Drun
Freeze
Rotary
Cylinder

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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
Diffusion in concentrated solutins differs from that in dilute solutions, because of the change in the __________ with the concentration of the solution.

Both A & B
Viscosity
Neither A nor B
Degree of ideality

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Mass Transfer
Lewis number (Le) is

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

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Mass Transfer
The Reynolds number of the liquid was increased 100 fold for a laminar falling film used for gas-liquid contacting. Assuming penetrating theory is applicable, the fold increase in the mass transfer co-efficient (Kc) for the same sytem is

1
100
10
5

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Mass Transfer
Air at a particular humidity is heated in a furnace. The new dew point

Depends on the extent of heating
Increases
Remain unchanged
Decreases

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