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Mass Transfer

Mass Transfer
Operating velocity in a packed tower is usually __________ the flooding velocity.

Twice
Half
More than
Equal to

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Mass Transfer
Penetration theory states that the mass transfer co-coefficient is equal to (where, De is diffusivity and 't' is time)

(4De/πt)1/2
(De.t)1/2
(De/t)1/2
(4De/t)

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Mass Transfer
Sticky material can be dried in a __________ dryer.

Rotary
Tray
None of these
Fluidised bed

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Mass Transfer
The change in enthalpy per unit weight of adsorbed gas when adsorbed on gas free or "outgassed" adsorbent to from a definite concentration of adsorbate is called its

Heat of wetting
Differential heat of adsorption
Integral heat of adsorption
Heat of normal condensation

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Mass Transfer
As per Gilliland's equation, the diffusivity is

Inversely proportional to 'P'
Dependent on the molecular volume & molecular weight of components
Directly proportional to 'T1.5'
All of these

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Mass Transfer
The binary diffusivity in gases and liquids vary respectively as

T and T3/2
T3/2 and √T
√T and T3/2
T3/2 and T

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