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Mass Transfer

Mass Transfer
Leaching of coarse solid lumps is also termed as

Dissolution
Decoction
Agitation and settling
Percolation

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Mass Transfer
Which of the following provides maximum contact surface for a liquid-vapour system?

Bubble-cap plate column
Seive-plate column
Wetted wall column
Packed tower

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Mass Transfer
The critical moisture content in case of drying indicates the __________ rate period.

End of falling
None of these
Beginning of constant
Beginning of falling

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

None of these
Extractive distillation
Absorption
Crystallisation

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Mass Transfer
Mass transfer co-efficient of liquid is

None of these
Affected much less by temperature than that for gases
Affected more by temperature than that for gases
Not affected by the temperature

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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

0.048
0.079
0.122
0.152

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