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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.

44119
30-40
70-80
90-100

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Mass Transfer
Condensation of a vapour-gas mixture just begins, when (where, p = partial pressure of the vapour P = vapour pressure of the liquid )

P >>P
P
P < P
P = P

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Mass Transfer
The temperature of water cooled in cooling tower is always __________ temperature of entering air.

Equal to the dry bulb
Equal to the wet bulb
Less than the wet bulb
More than the wet bulb

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

Packed
Tray
Spray
Bubble

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Mass Transfer
NSc/NPr is called the

Stantan number
Lewis number
Psychrometric ratio
Sherwood number

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Mass Transfer
Sand is dried in foundaries in a___drier.

Rotary
Vacuum
Spray
Fluidisedbed

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