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Mass Transfer

Mass Transfer
The Kundsen diffusivity is proportional to (where, T = absolute temperature)

T
T⁴
√T
T²

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Mass Transfer
Which of the following adsorbant is used in the refinning of sugar?

Activated clay
Bone charcoal
Wood charcoal
Silica gel

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Mass Transfer
Mass transfer co-efficient is defined as

None of the listed here
Flux=concentration difference/co-effi-cient
Flux = Co-efficient/concentration difference
Co-efficient = Flux/concentration difference

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Mass Transfer
With decrease in the throughput (compared with the design capacity) for a bubble cap distillation column, its efficiency

Increases
Decreases
Remains same
May increase or decrease ; depends on individual design

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Mass Transfer
The most economical range of absorption factor is

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

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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.

18.7
27.3
20
21.7

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