Acetone is to be removed from air in an isothermal dilute absorber using pure water as solvent. The incoming air contains 5 mole% of acetone (yin = 0.05). The design equation to be used for obtaining the number of trays (N) of the absorber is, N+2 = 6 log (yin/yout).For 98% recovery of acetone, the number of trays required is/are

Mass Transfer
Acetone is to be removed from air in an isothermal dilute absorber using pure water as solvent. The incoming air contains 5 mole% of acetone (yin = 0.05). The design equation to be used for obtaining the number of trays (N) of the absorber is, N+2 = 6 log (yin/yout).For 98% recovery of acetone, the number of trays required is/are

8

10

1

9

8

10

1

9

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Mass Transfer
The individual mass transfer co-efficients (moles/m² . s) for absorption of a solute from a gas mixture into a liquid solvent are, KL = 4.5 and KG = 1.5. The slope of the equilibrium line is 3. Which of the following resistance (s) is (are) controlling ?

Interfacial

Both liquid and gas side

Gas side

Liquid side

Interfacial

Both liquid and gas side

Gas side

Liquid side

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Mass Transfer
Molecular seives are porous

Synthetic zeolites crystals/metal alumino-silicates

Alumina

Silica

None of these

Synthetic zeolites crystals/metal alumino-silicates

Alumina

Silica

None of these

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Mass Transfer
The relative humidity of air decreases in-spite of an increase in the absolute humidity, when the

Temperature rises

Pressure rises

Temperature falls

Pressure falls

Temperature rises

Pressure rises

Temperature falls

Pressure falls

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Mass Transfer
Penetration theory relates the average mass transfer co-efficient (K) with diffusivity (D) as

K ∝ D1.5

K ∝ D

K ∝ D2

K ∝ √D

K ∝ D1.5

K ∝ D

K ∝ D2

K ∝ √D

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Mass Transfer
Pick out the wrong statement. Raoult's law does not apply, when the

Attractive forces between like and unlike molecules in the solution are approximately equal

Size of component molecules are not equal

Chemical combination or molecular association between unlike molecules takes place in the formation of solution

Component molecules are nonpolar

Attractive forces between like and unlike molecules in the solution are approximately equal

Size of component molecules are not equal

Chemical combination or molecular association between unlike molecules takes place in the formation of solution

Component molecules are nonpolar

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Mass Transfer

Mass Transfer The individual mass transfer co-efficients (moles/m² . s) for absorption of a solute from a gas mixture into a liquid solvent are, KL = 4.5 and KG = 1.5. The slope of the equilibrium line is 3. Which of the following resistance (s) is (are) controlling ?

Mass Transfer Molecular seives are porous

Mass Transfer The relative humidity of air decreases in-spite of an increase in the absolute humidity, when the

Mass Transfer Penetration theory relates the average mass transfer co-efficient (K) with diffusivity (D) as

Mass Transfer Pick out the wrong statement. Raoult's law does not apply, when the

Mass Transfer
The individual mass transfer co-efficients (moles/m² . s) for absorption of a solute from a gas mixture into a liquid solvent are, KL = 4.5 and KG = 1.5. The slope of the equilibrium line is 3. Which of the following resistance (s) is (are) controlling ?

Mass Transfer
Molecular seives are porous

Mass Transfer
The relative humidity of air decreases in-spite of an increase in the absolute humidity, when the

Mass Transfer
Penetration theory relates the average mass transfer co-efficient (K) with diffusivity (D) as

Mass Transfer
Pick out the wrong statement. Raoult's law does not apply, when the