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Mass Transfer

Mass Transfer
Small dia distillation column can be a

Bubble cap
Sieve tray
Any of these
Packed column

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Mass Transfer
The reason for preferring packed towers over plate towers in distillation practice is that the packed tower operation gives

Low pressure drop and low hold up
High pressure drop and low hold up
Low pressure drop and high hold up
High pressure drop and high hold up

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Mass Transfer
Which of the following plays an important role in problems of simultaneous heat and mass transfer?

Sherwood number
Schmidt number
Prandtl number
Lewis number

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

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

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Mass Transfer
According to Chilton-Colburn analogy for mass transfer, NSt.NSc2/3 is equal to

F/2
1/f
F
2f

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Mass Transfer
Surface renewal model of mass transfer was enunciated by

Fick
Stefan
Toor and Marchello
Danckwerts

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