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Mass Transfer

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

1/μ
μ²
μ
√μ

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Mass Transfer
The mass transfer co-efficient for a solid sphere of radius 'a' dissolving in a large volume of quiescent liquid, in which D is the diffusivity of solute, is

D/a
D/2a
Dependent on the Reynolds number
Proportional to √D

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Mass Transfer
Raschig ring made of procelain cannot be used for treating concentrated

Nitric acid
Hydrochloric acid
Sulphuric acid
Alkalis

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Mass Transfer
With increase in temperature, the rate of extraction in leaching (solid-liquid extraction system)

Increases
Decreases
Remains unaffected
Increases Linearly

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Mass Transfer
Absorption factor is defined as (where, S₁ = slope of the operating line S₂ = slope of the equilibrium curve)

S₁/S₂
S₂/S₁
S₁ - S₂
S₁ x S₂

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Mass Transfer
Dry bulb temperature of the gas is __________ the wet bulb temperature.

Equal to
Less than
More than
None of these

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