For the gas absorption, the height of a transfer unit, based on the gas phase is given by (G: superficial molar gas velocity, L: superficial molar liquid velocity, FG:mass transfer co-efficient, mols/m² , a: in-terfacial area per unit volume of tower)

Mass Transfer
For the gas absorption, the height of a transfer unit, based on the gas phase is given by (G: superficial molar gas velocity, L: superficial molar liquid velocity, FG:mass transfer co-efficient, mols/m² , a: in-terfacial area per unit volume of tower)

FG/(G.a)

(G.a)/FG

L/(FG.G)

F/(FG.a)

FG/(G.a)

(G.a)/FG

L/(FG.G)

F/(FG.a)

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Mass Transfer
McCabe-Thiele method

Uses weight fractions to express liquid and vapour composition

Is more accurate than Ponchan-Savarit method

Can use any type of units

Uses molal units for material and energy balance

Uses weight fractions to express liquid and vapour composition

Is more accurate than Ponchan-Savarit method

Can use any type of units

Uses molal units for material and energy balance

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Mass Transfer
Which of the following plays an important role in problems of simultaneous heat and mass transfer?

Prandtl number

Schmidt number

Sherwood number

Lewis number

Prandtl number

Schmidt number

Sherwood number

Lewis number

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Mass Transfer
A distillation column with N plates is being operated under normal conditions. At some point of time, the operation is shifted to total reflux condition (i.e., no product and residue are being withdrawn and feed to the column is stopped). At the new steady state,

Reboiler load and condenser load are minimum

The top and bottom compositions correspond to the maximum enrichment available

Composition of vapors and that of liquid do not vary throughout the column

The top and bottom compositions are unchanged with and without total reflux

Reboiler load and condenser load are minimum

The top and bottom compositions correspond to the maximum enrichment available

Composition of vapors and that of liquid do not vary throughout the column

The top and bottom compositions are unchanged with and without total reflux

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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

Dependent on the Reynolds number

D/2a

Proportional to √D

D/a

Dependent on the Reynolds number

D/2a

Proportional to √D

D/a

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Mass Transfer
Positive deviation from Raoult's law means a mixture whose total pressure is

Less than the sum of the vapour pressure of the components

Less than that computed for ideality

Greater than that computed for ideality

None of these

Less than the sum of the vapour pressure of the components

Less than that computed for ideality

Greater than that computed for ideality

None of these

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Mass Transfer

Mass Transfer For the gas absorption, the height of a transfer unit, based on the gas phase is given by (G: superficial molar gas velocity, L: superficial molar liquid velocity, FG:mass transfer co-efficient, mols/m² , a: in-terfacial area per unit volume of tower)

Mass Transfer McCabe-Thiele method

Mass Transfer Which of the following plays an important role in problems of simultaneous heat and mass transfer?

Mass Transfer A distillation column with N plates is being operated under normal conditions. At some point of time, the operation is shifted to total reflux condition (i.e., no product and residue are being withdrawn and feed to the column is stopped). At the new steady state,

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

Mass Transfer Positive deviation from Raoult's law means a mixture whose total pressure is

Mass Transfer
For the gas absorption, the height of a transfer unit, based on the gas phase is given by (G: superficial molar gas velocity, L: superficial molar liquid velocity, FG:mass transfer co-efficient, mols/m² , a: in-terfacial area per unit volume of tower)

Mass Transfer
McCabe-Thiele method

Mass Transfer
Which of the following plays an important role in problems of simultaneous heat and mass transfer?

Mass Transfer
A distillation column with N plates is being operated under normal conditions. At some point of time, the operation is shifted to total reflux condition (i.e., no product and residue are being withdrawn and feed to the column is stopped). At the new steady state,

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

Mass Transfer
Positive deviation from Raoult's law means a mixture whose total pressure is