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Mass Transfer

Mass Transfer
Mass transfer co-efficient varies as DAB0.5, according to the __________ theory.

Penetration
Film
None of these
Surface renewal

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Mass Transfer
A mixture of 10% C₆H₆ vapour in air at 25°C and 750 mm Hg has a dew point of 20°C. Its dew point at 30°C and 700 mm Hg will be around __________ °C.

21.7
18.7
20
27.3

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Mass Transfer
The most economical range of absorption factor is

1.25 to 2
2 to 2.5
5 to 10
2.5 to 3

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Mass Transfer
Extraction of pencillin employs a __________ extraction coloumn.

Packed
Centrifugal
Plate
None of these

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Mass Transfer
The minimum number of theoretical plates is required for achieving a given separation in distillation column with

Total reflux
No reflux
Minimum reflux ratio
Zero reflux ratio

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Mass Transfer
Penetration theory states that the mass transfer co-coefficient is equal to (where, De is diffusivity and 't' is time)

(4De/t)
(4De/πt)1/2
(De.t)1/2
(De/t)1/2

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