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MASS TRANSFER

Mass Transfer
Leaching of uranium ore and gold ore is done in

None of these
Centrifugal extractor
Bollman extractor
Pachuka tanks

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Mass Transfer
Acetone is to be removed from air in an isothermal dilute absorber using pure water as solvent. The incoming air contains 5 mole% of acetone (yin = 0.05). The design equation to be used for obtaining the number of trays (N) of the absorber is, N+2 = 6 log (yin/yout).For 98% recovery of acetone, the number of trays required is/are

9
8
1
10

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

None of these
Infinite
Minimum
Optimum

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

Infinite
Zero
Minimum
Maximum

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Mass Transfer
Drying operation under vacuum is carried out to

Dry those materials which have very high unbound mositure content
Dry materials having high bound moisture content
Reduce drying temperature
Increase drying temperature

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