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Mass Transfer

Mass Transfer
A natural draft cooling tower is filled with wooden grids, which covers about __________ percent of the tower height.

90-100
44119
30-40
70-80

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Mass Transfer
Very tall packed towers are divided into series of beds to

Reduce the overall pressure drop
Avoid flooding
Avoid channelling
Reduce liquid hold-up

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Mass Transfer
Make up water is supplied during cooling tower operation to compensate for water losses due to

Entrainment
Evaporation
Blowdown
All of these

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Mass Transfer
What is the reflux ratio at total reflux?

Unity
Infinity
Zero
Data insufficient

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Mass Transfer
Chemisorption compared to physical absorption has

Lower capacity of the solvent for the solute gas
Lower adsorption rate
Increased utilisation of stagnant zones of the liquid phase
None of these

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Mass Transfer
______ extractor uses centrifugal force for separating the two phases.

Schiebel
None of the listed here
Treybal
Podbielniak

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