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Mass Transfer

Mass Transfer
The value of NA/(NA + NB), for steady state equimolal counter diffusion of two gases 'A' and 'B' is

∞
1
0.5
2

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Mass Transfer
In extraction, as the temperature increases, the area of hetrogeneity (area covered by binodal curve)

Remains unchanged
Decreases
None of these
Increases

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Mass Transfer
Ammonia present in the coke oven gas is removed by washing with

Ethanolamine
Dilute HCl
Caustic solution
Dilute ammoniacal liquor

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Mass Transfer
Can a cooling tower cool water below the wet bulb temperature of inlet air?

No
Yes ; but the air flow rate should be excessively high
Yes ; but height of cooling tower will be prohibitively high
Yes

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Mass Transfer
For ethanol-water system, the lowering of distillate quality from 95% to 92% will cause __________ plate requirement.

Major decrease in the number of
None of the listed here
Marginal decrease in the number of
No change in theoretical

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Mass Transfer
Which of the following parameters remains constant during chemical dehumidifica-tion?

Wet bulb temperature
Partial pressure of vapour
Dry bulb temperature
None of these

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