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
In an absorption coloumn, the flooding velocity for random packing is __________ that for stacked/regular packing.

Equal to

Greater than

Smaller than

Either A, or B ; depends on the type of packing

Equal to

Greater than

Smaller than

Either A, or B ; depends on the type of packing

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Mass Transfer
It takes 6 hours to dry a wet solid from 50% moisture content to the critical moisture content of 15%. How much longer it will take to dry the solid to 10% moisture content, under the same drying conditions? (The equilibrium moisture content of the solid is 5%).

15 min

51 min

94 min

71 min

15 min

51 min

94 min

71 min

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Mass Transfer
The surface renewal frequency in Danckwerts model of mass transfer is given by (KL: mass transfer co-efficient)

KL²/DA

KL².DA

KL/DA²

√(KL².DA)

KL²/DA

KL².DA

KL/DA²

√(KL².DA)

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Mass Transfer
In a moderately sized packed absorption tower, channeling (which is most severe with stacked packings) can be minimised by taking the ratio of tower diameter to packing diameter

< 8 : 1

< 6:1

> 4 :1

> 8:1

< 8 : 1

< 6:1

> 4 :1

> 8:1

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Mass Transfer
Corresponding to Nusselt number in heat transfer, the dimensionless group in mass transfer is the __________ number.

Schmidt

Peclet

Stanton

Sherwood

Schmidt

Peclet

Stanton

Sherwood

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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 In an absorption coloumn, the flooding velocity for random packing is __________ that for stacked/regular packing.

Mass Transfer It takes 6 hours to dry a wet solid from 50% moisture content to the critical moisture content of 15%. How much longer it will take to dry the solid to 10% moisture content, under the same drying conditions? (The equilibrium moisture content of the solid is 5%).

Mass Transfer The surface renewal frequency in Danckwerts model of mass transfer is given by (KL: mass transfer co-efficient)

Mass Transfer In a moderately sized packed absorption tower, channeling (which is most severe with stacked packings) can be minimised by taking the ratio of tower diameter to packing diameter

Mass Transfer Corresponding to Nusselt number in heat transfer, the dimensionless group in mass transfer is the __________ number.

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
In an absorption coloumn, the flooding velocity for random packing is __________ that for stacked/regular packing.

Mass Transfer
It takes 6 hours to dry a wet solid from 50% moisture content to the critical moisture content of 15%. How much longer it will take to dry the solid to 10% moisture content, under the same drying conditions? (The equilibrium moisture content of the solid is 5%).

Mass Transfer
The surface renewal frequency in Danckwerts model of mass transfer is given by (KL: mass transfer co-efficient)

Mass Transfer
In a moderately sized packed absorption tower, channeling (which is most severe with stacked packings) can be minimised by taking the ratio of tower diameter to packing diameter

Mass Transfer
Corresponding to Nusselt number in heat transfer, the dimensionless group in mass transfer is the __________ number.