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Mass Transfer

Mass Transfer
The operating cost of a distillation column at minimum reflux ratio is

Zero
Minimum
Infinite
Maximum

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Mass Transfer
For a single component absorber, the operating line is straight only when plotted in term of __________ units.

Mole fraction
None of these
Partial pressure
Mole ratio

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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)

1000
100
50
500

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Mass Transfer
The binary diffusivity in gases at atmospheric conditions is about

10-3 sec/cm
10-1 cm²/sec
10-4 cm²/seC₂
10-9 cm/sec

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Mass Transfer
According to Poiseuille's law, the permeability for gas flow through a capillary is proportional to (where, μ = gas viscosity)

μ
1/μ
√μ
μ²

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Mass Transfer
Separation of two or more components of a liquid solution can not be achieved by

Liquid extraction
Evaporation
Absorption
Fractional crystallisation

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