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Mass Transfer

Mass Transfer
__________ column is used in gas absorption process.

Wetted wall
Bubble cap
Packed
Seive/perforated tray

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Mass Transfer
Heat sensitive materials like certain pharmaceuticals and food stuffs can be dried in a/an __________ dryer.

Freeze
Spray
None of these
Indirect tray

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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
T²
√T
T³

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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

0.122
0.079
0.048
0.152

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Mass Transfer
Molecular seives are porous

Alumina
Silica
Synthetic zeolites crystals/metal alumino-silicates
None of these

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Mass Transfer
The feed to fractionating column is changed from saturated vapour to saturated liquid. If the separation and reflux ratio remains unchanged, the number of ideal stages will

Decrease
Increase
Depend on saturated boiling point; may increase or decrease
Remains same

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