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Mass Transfer

Mass Transfer
In a binary distillation column, if the feed contains 40 mole % vapour, the q line will have a slope of

1.5
-0.6
-1.5
0.6

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Mass Transfer
As the reflux ratio decreases, the

None of these
Separation becomes more efficient
Number of plates increases
Column diameter increases

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Mass Transfer
The binary diffusivity in gases at atmospheric conditions is about

10-3 sec/cm
10-9 cm/sec
10-4 cm²/seC₂
10-1 cm²/sec

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Mass Transfer
At what value of reflux ratio, number of theoretical plates in a distillation column is minimum?

∞
1
< 1

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Mass Transfer
In the constant rate period of the rate of drying curve for batch drying,

None of these
Cracks develop on the surface of the solid
Rate of drying decreases abruptly
Surface evaporation of unbound moisture occurs

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Mass Transfer
In physical terms, Schmidt number means

Thermal diffusivity/momentum diffusivity
Thermal diffusivity/mass diffusivity
Momentum diffusivity/mass diffusivity
Mass diffusivity/thermal diffusivity

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