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Mass Transfer

Mass Transfer
__________ column is preferred to be used, when a high liquid hold up is required in a reactor for gas-liquid reaction.

Packed
Spray
Tray
Bubble

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Mass Transfer
Which of the following liquid-vapor contacting devices provides maximum contact surface area for a particular duty?

Bubble cap column
Randomly packed column
Wetted wall column
Sieve plate column

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Mass Transfer
The value of NA/(NA + NB), for steady state equimolal counter diffusion of two gases 'A' and 'B' is

1
∞
2
0.5

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Mass Transfer
For which of the following unit operations, Lewis number is of significance?

Adsorption
Binary distillation
Humidification
Gas absorption

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Mass Transfer
Back-trapping in a distillation column

Is desirable, as it provides improved vapour-liquid contact
Reduces pressure drop
Increases tray efficiency
Decreases tray efficiency

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Mass Transfer
When a multistage tray tower uses a minimum reflux ratio, it implies

Minimum trays and minimum reboiler heat load
Infinite trays and minimum reboiler heat load
Minimum trays and maximum reboiler heat load
Infinite trays and maximum reboiler heat load

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