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Mass Transfer

Mass Transfer
Prandtl number for water at 20°C is about

70
0.7
7
150

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Mass Transfer
The-relative volatility for separation of a non-ideal binary mixture by distillation should be

> 1
1
< 1

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Mass Transfer
For the same process conditions, the reflux ratio of an unlagged distillation column

Decreases in winter
Increases in summer
None of these
Increases in winter

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Mass Transfer
Weight of 1 m³ of humid air as compared to 1 m³ of dry air, under the same conditions, is

Unpredictable
Less
More
Same

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

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

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Mass Transfer
Which of the following is the most suitable for extraction in a system having very low density difference?

Centrifugal extractor
Packed extraction tower
Mixer-settler extractor
Pulsed extractor

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