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Mass Transfer

Mass Transfer
Leaching of coarse solid lumps is also termed as

Decoction
Percolation
Dissolution
Agitation and settling

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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)

8.25
8.89
6.89
10

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Mass Transfer
The rough value of diffusion co-efficient of water vapor into air at 25°C may be about __________ cm²/sec.

2.5
0.25
0.0025
1.25

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Mass Transfer
Which of the following gas-liquid contacting devices incurs the least pressure drop for a particular duty?

Grid tray tower
Perforated tray tower
Bubble cap tower
Wetted wall tower

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Mass Transfer
The relative volatility of a binary mixture at constant temperature __________ the total pressure.

Is independent of
Increases with increase in
Decreases with increase in
None of these

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Mass Transfer
During bottling of cold drinks (e.g. Pepsi), the main resistance to mass transfer for the absorption of carbon dioxide in water lies in the

Liquid-gas interface
None of these
Gas film
Liquid film

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