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Mass Transfer

Mass Transfer
Molality is defined as the number of gm moles of solute per __________ of solvent.

Gm
Kg
Litre
m³

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Mass Transfer
Components, having widely different boiling point in a binary mixture, can be separated using __________ distillation.

Molecular
Extractive
Simple
Steam

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Mass Transfer
Mass transfer co-efficient of liquid is

Affected much less by temperature than that for gases
Affected more by temperature than that for gases
Not affected by the temperature
None of these

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Mass Transfer
Reboiler is considered as one theoretical plate, because

Of the assumption that vapour and liquid leaving the reboiler are in equilibrium
Reboiler itself contains one plate
Vapour is recycled to the column
None of these

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Mass Transfer
The drying time between fixed moisture content within diffusion controlled 'falling rate period' is proportional to (assuming that drying occurs from all surfaces of the solid) (where, T = thickness of the solid )

T²
T
T³
√T

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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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