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Mass Transfer

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

Re0.53
Re0.83
Re
Re0.33

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Mass Transfer
Flash distillation is suitable for separating the constituents of a binary system, which

Have very wide boiling points
Form minimum boiling azeotrope
Form constant boiling azeotrope
Have very close boiling points

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Mass Transfer
Tower diameter may be decreased by

Increasing the liquid flow rate
Use of increased tray spacing
Using higher reflux ratio
Increasing the vapour flow rate

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Mass Transfer
NSc/NPr is called the

Lewis number
Psychrometric ratio
Sherwood number
Stantan number

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Mass Transfer
The slope of the operating line for a single component co-current absorber when plotted in terms of mole ratio units is

-ve
+ve
∞

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Mass Transfer
Which of the following same diameter columns gives lowest pressure drop per unit height?

Packed column (stacked)
Sieve-plate column
Randomly packed column
Bubble-cap column

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