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Mass Transfer

Mass Transfer
__________ equation applies to diffusivities in liquids.

Wilke and Chang
None of these
Hirschfelder
Gilliland

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

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

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Mass Transfer
Heat in BTU necessary to increase the temperature of 1 lb of gas and its accompanying vapour by 1°F is called the

Latent heat
Sensible heat
Specific heat
Humid heat

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Mass Transfer
The commonly used solvent in supercritical extraction is

Water
Carbon tetrachloride
Carbon dioxide
Methyl ethyl ketone

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Mass Transfer
With increase in the concentration of the adsorbate, the integral heat of adsorption

May increase or decrease ; depends on the type of adsorbate
Remains unchanged
Decreases
Increases

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Mass Transfer
Which of the following is the most suitable for extraction in a system having very low density difference?

Mixer-settler extractor
Pulsed extractor
Packed extraction tower
Centrifugal extractor

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