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Mass Transfer

Mass Transfer
For continuous drying of grannular or crystalline material, the dryer used is the __________ dryer.

Tray
Tunnel
None of these
Rotary

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Mass Transfer
Equilibrium moisture of a solid is equal to the total moisture minus free moisture. Which of the following substances will have maxi-mum equilibrium moisture?

Anthracite coal
Rag paper
Inorganic solids
Bamboo

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Mass Transfer
Tea percolation employs

Liquid-liquid extraction
Leaching
None of these
Absorption

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Mass Transfer
Critical humidity of a solid salt means the humidity

Both A and B
Above Which it will always become dry and below which it will always stay damp
Below which it will always stay dry
Above which it will always become damp

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Mass Transfer
The equipment used in the extraction of highly corrosive radio active liquids is

Pulse column
Spray column
Baffle tower
Mixer settler

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Mass Transfer
The value of Lewis number (Le = Sc/Pr) for air-water vapour system is around

600
0.24
3.97
1

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