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Mass Transfer

Mass Transfer
Sand is dried in foundaries in a___drier.

Spray
Rotary
Vacuum
Fluidisedbed

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Mass Transfer
At what value of reflux ratio, number of theoretical plates in a distillation column is minimum?

1
< 1
∞

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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
An air-water vapour mixture has a dry bulb temperature of 60°C and a dew point temperature of 40°C. The total pressure is 101.3 kPa and the vapour pressure of water at 40°C and 60°C are 7.30 kPa and 19.91 kPa respectively.The humidity of air sample expressed as kg of water vapour/kg of dry air is

0.079
0.048
0.152
0.122

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Mass Transfer
NSc/NPr is called the

Stantan number
Sherwood number
Psychrometric ratio
Lewis number

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Mass Transfer
'ADDUCTS' and 'CLATHRATES' are used in case of

Crystallisation
None of these
Extractive distillation
Absorption

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