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Mass Transfer

Mass Transfer
What is the reflux ratio at total reflux?

Data insufficient
Unity
Infinity
Zero

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Mass Transfer
High pressure at the bottom of a distillation tower handling heat sensitive materials results in

Increased relative volatility
Erosion of the tower
Thermal decomposition of bottoms
Very efficient operation

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Mass Transfer
Separation of __________ employs gaseous diffusion process.

Isotopes of uranium
N₂ and O₂ from air
Isotopes of helium
SO₂ and air

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Mass Transfer
For turbulent mass transfer in pipes, the Sherwood number depends on the Reynolds number as

Re0.53
Re
Re0.83
Re0.33

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Mass Transfer
In a moderately sized packed absorption tower, channeling (which is most severe with stacked packings) can be minimised by taking the ratio of tower diameter to packing diameter

> 8:1
> 4 :1
< 6:1
< 8 : 1

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Mass Transfer
Packed column distillation is limited to the column __________ metres.

Height < 6
Neither A nor B
Diameter < 0.6
Both A & B

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