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Mass Transfer

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

Tunnel
Tray
Rotary
None of these

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Mass Transfer
In the layout plan for a vacuum distillation unit, operating at 60 mm Hg, supported by a barometric condenser, the appropriate place for the location of vacuum drum for collecting the distillate will be

10 metres above ground
2 metres above the ground
At ground level
5 metres above ground

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Mass Transfer
In case of gases, the binary diffusivity is proportional to (where, P = pressure)

√P
1/√P
1/P
P

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Mass Transfer
During drying of a solid, the critical moisture content increases with

Decreased drying rate
Increased thickness of the solid
Both B and C
Increased drying rate

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Mass Transfer
The reason for preferring packed towers over plate towers in distillation practice is that the packed tower operation gives

High pressure drop and low hold up
Low pressure drop and low hold up
High pressure drop and high hold up
Low pressure drop and high hold up

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Mass Transfer
Use of packed towers for distillation is generally limited to the

Vacuum distillation
High pressure operation
Small sizes
Multicomponent distillation

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