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Mass Transfer

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

None of these
Tunnel
Tray
Rotary

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Mass Transfer
In liquid extraction, if the selectivity is unity, then

Amount of solvent required will be minimum
Separation of the constituents is the most effective
Solvent flow rate should be very low
No separation will occur

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Mass Transfer
Back-trapping in a distillation column

Decreases tray efficiency
Increases tray efficiency
Is desirable, as it provides improved vapour-liquid contact
Reduces pressure drop

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Mass Transfer
Penetration model (theory) for mass transfer was enunciated by

Toor and Marchello
Higbie
Danckwerts
Kissinevskii

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Mass Transfer
Moisture in a solid exerting an equilibrium vapour pressure equal to that of the pure liquid at the same temperature is called the __________ moisture.

Unbound
Critical
Bound
Free

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Mass Transfer
Which of the following liquid-vapor contacting devices provides maximum contact surface area for a particular duty?

Randomly packed column
Bubble cap column
Sieve plate column
Wetted wall column

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