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Mass Transfer

Mass Transfer
Tea percolation employs

Liquid-liquid extraction
Absorption
Leaching
None of these

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Mass Transfer
The mass transfer co-efficient for a solid sphere of radius 'a' dissolving in a large volume of quiescent liquid, in which D is the diffusivity of solute, is

D/2a
Dependent on the Reynolds number
Proportional to √D
D/a

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Mass Transfer
Milk is dried usually in a __________ dryer.

Tray
Rotary
Freeze
Spray

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Mass Transfer
H₂S present in naphtha reformed gas is removed by absorbing with

Vacuum gas oil
K₂CO₃
HCl
Ethanolamine

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Mass Transfer
Most important factor to be considered in the selection of packings for absorbers is the __________ of packing.

Porosity
Size
Cost
Durability

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Mass Transfer
It takes 6 hours to dry a wet solid from 50% moisture content to the critical moisture content of 15%. How much longer it will take to dry the solid to 10% moisture content, under the same drying conditions? (The equilibrium moisture content of the solid is 5%).

94 min
71 min
51 min
15 min

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