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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
∞
2
0.5

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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
Drying operation under vacuum is carried out to

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

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Mass Transfer
In case of cooling towers, the ratio of the rates of heat and mass transfer is indicated by the __________ number.

None of these
Lewis
Sherwood
Grashoff

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Mass Transfer
Which of the following is not a continuous drier?

Drum drier
Tray drier
Spray drier
Tunnel drier

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Mass Transfer
Pick out the correct relationship. (where, Ri = internal reflux ratio Ro = external reflux ratio. )

(1 + Ro) = Ro/Ri
(1 - Ro) = Ro/Ri
(1 - Ri) = Ro/Ri
(1 + Ri) = Ro/Ri

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