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Mass Transfer

Mass Transfer
Free flowing granular materials can be best dried in a __________ drier.

Cylinder
Rotary
Drun
Freeze

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Mass Transfer
In a single stage extraction process, 10 kg of pure solvent S (containing no solute A) is mixed with 30 kg of feed F containing A at a mass fraction xf = 0.2. The mixture splits into an extract phase E and a raf-finate phase R containing A at xB = 0.5 and xR = 0.05 respectively. The total mass of the extract phase is (in Kg)

8.89
8.25
10
6.89

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Mass Transfer
For a binary mixture with low relative volatility, continuous rectification to get pure products will require

Low reflux ratio
Small cross-section column
High reflux ratio
Less number of trays

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Mass Transfer
Capacity of a rotary dryer depends on its

Inclination with ground surface
R.p.m
None of the listed here
Both Inclination with ground surface & R.p.m

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Mass Transfer
Moisture in a substance exerting an equilibrium vapour pressure less than that of pure liquid at the same temperature is called the __________ moisture.

Bound
Critical
None of these
Unbound

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Mass Transfer
Lewis number, which is important in problems involving simultaneous heat and mass transfer, is the ratio of

Mass diffusivity to momentum diffusivity
None of these
Momentum diffusivity to thermal diffusivity
Thermal diffusivity to mass diffusivity

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