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Mass Transfer

Mass Transfer
The value of L/mG ratio for economical absorption operation ranges from

2.5 to 3.5
0.5 to 0.8
0.8 to 1.2
1.25 to 2.0

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Mass Transfer
The ratio of Murphree plate efficiency to point efficiency is 1 in a __________ flow model.

Plug
Both plug & perfectly mixed
None of the listed here
Perfectly mixed

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Mass Transfer
The Reynolds number of the liquid was increased 100 fold for a laminar falling film used for gas-liquid contacting. Assuming penetrating theory is applicable, the fold increase in the mass transfer co-efficient (Kc) for the same sytem is

100
5
10
1

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Mass Transfer
In batch distillation with constant reflux, overhead product composition __________ with time.

Does not vary
Increases
Decreases
May increase on decrease, depends on the system

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Mass Transfer
Which of the following is not a continuous leaching equipment?

Hydrocyclones
Kennedy extractor
Bollman extractor
Pachuka tank

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Mass Transfer
For the case of flow of air past a wet bulb thermometer (air water vapour system), the approximate value of Hâ‚‚/ky.Cz is around

0.24
1
0.6
0.72

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