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Mass Transfer

Mass Transfer
For turbulent mass transfer in pipes, the Sherwood number depends on the Reynolds number as

Re0.33
Re
Re0.53
Re0.83

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Mass Transfer
The interfacial area per unit volume of dispersion, in a gas-liquid contactor, for fractional hold up of gas = 0.1 and gas bubble diameter = 0.5 mm is given by (in m²/m³)

100
1000
500
50

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Mass Transfer
If a₁ and a₂ are the relative volatilities when the pressure in the distillation column is 1 and 2 atm respectively. Pick out the correct statement.

None of these
a₁ = 2a₂
a₁ = a₂
a₁ = 0.5 a₂

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Mass Transfer
The dew point of an unsaturated gas-vapor mixture does not depend upon the __________ of the mixture.

Total pressure
Composition
All of these
Temperature

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Mass Transfer
Tea percolation employs

None of these
Liquid-liquid extraction
Leaching
Absorption

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Mass Transfer
Swenson-Walker crystalliser is a __________ unit

Cooling (adiabatic)-cum-evaporation
Batch
Continuous
Semi-batch

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