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Mass Transfer

Mass Transfer
In paper industry, paper is dried in a __________ dryer.

Conveyor
Festoon
Tunnel
Heated cylinder

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Mass Transfer
The binary diffusivity in gases at atmospheric conditions is about

10-3 sec/cm
10-1 cm²/sec
10-9 cm/sec
10-4 cm²/seC₂

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Mass Transfer
At a fixed pressure, the humidity depends upon the partial pressure of vapor in the mixture. Humidity of a vapour free gas is __________ percent.

Between 0 and 100
50
100

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Mass Transfer
An alkaline solution is used to reduce the concentration of carbon dioxide in a stream from 10% to 0.1% by absorption with irreversible chemical reaction. The overall number of transfer units based on gas phase is

0.001
9.21
100
4.605

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

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

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Mass Transfer
The operating cost of a distillation column at minimum reflux ratio is

Maximum
Minimum
Zero
Infinite

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