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Mass Transfer

Mass Transfer
Large scale drying of wheat is done in a __________ dryer.

Spouted bed
Fluidised bed
Tray
Vacuum rotary

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Mass Transfer
Diameter to height ratio for a rashig ring is

2
1
5
0.5

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Mass Transfer
The critical moisture content in case of drying indicates the __________ rate period.

End of falling
Beginning of falling
Beginning of constant
None of these

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Mass Transfer
The process employing desorption of the absorbed solute by a solvent is called

Osmosis
Reverse osmosis
Sublimation
Elution

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Mass Transfer
Inside the distillation columns, the

All of these
Highest temperatures is near the feed plate
Vapors are not always at their dew points
Driving force for the liquid flow is its weight

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Mass Transfer
The interfacial area per unit volume of dispersion, in a gas-liquid contactor, for fractional hold up of gas = 0.1 and gas bubble diameter = 0.5 mm is given by (in m²/m³)

500
100
1000
50

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