According to the Fenske equation, what will be the minimum number of plates required in a distillation column to separate an equimolar binary mixture of components A and B into an overhead fraction containing 99 mol% A and a bottom fraction containing 98 mol% B? Assume that relative volatility (αAB = 2) does not change appreciably in the coloumn.

Mass Transfer
According to the Fenske equation, what will be the minimum number of plates required in a distillation column to separate an equimolar binary mixture of components A and B into an overhead fraction containing 99 mol% A and a bottom fraction containing 98 mol% B? Assume that relative volatility (αAB = 2) does not change appreciably in the coloumn.

10

6

12

8

10

6

12

8

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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

D/a

Proportional to √D

Dependent on the Reynolds number

D/2a

D/a

Proportional to √D

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Mass Transfer
Air initially at 101. 3 kPa and 40°C and with a relative humidity of 50%, is cooled at constant pressure to 30°C. The cooled air has a

Higher wet bulb temperature

Higher dew point

Higher relative humidity

Higher absolute (specific) humidity

Higher wet bulb temperature

Higher dew point

Higher relative humidity

Higher absolute (specific) humidity

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Mass Transfer
For which of the following unit operations, Lewis number is of significance?

Gas absorption

Humidification

Binary distillation

Adsorption

Gas absorption

Humidification

Binary distillation

Adsorption

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Mass Transfer
Can a cooling tower cool water below the wet bulb temperature of inlet air?

No

Yes ; but height of cooling tower will be prohibitively high

Yes

Yes ; but the air flow rate should be excessively high

No

Yes ; but height of cooling tower will be prohibitively high

Yes

Yes ; but the air flow rate should be excessively high

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Mass Transfer
The interfacial area per unit volume of dispersion, in a gas-liquid contactor, for fractional hold up of gas = 0.1 and gas bubble diameter = 0.5 mm is given by (in m²/m³)

500

50

1000

100

500

50

1000

100

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Mass Transfer

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 Air initially at 101. 3 kPa and 40°C and with a relative humidity of 50%, is cooled at constant pressure to 30°C. The cooled air has a

Mass Transfer For which of the following unit operations, Lewis number is of significance?

Mass Transfer Can a cooling tower cool water below the wet bulb temperature of inlet air?

Mass Transfer The interfacial area per unit volume of dispersion, in a gas-liquid contactor, for fractional hold up of gas = 0.1 and gas bubble diameter = 0.5 mm is given by (in m²/m³)

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
Air initially at 101. 3 kPa and 40°C and with a relative humidity of 50%, is cooled at constant pressure to 30°C. The cooled air has a

Mass Transfer
For which of the following unit operations, Lewis number is of significance?

Mass Transfer
Can a cooling tower cool water below the wet bulb temperature of inlet air?

Mass Transfer
The interfacial area per unit volume of dispersion, in a gas-liquid contactor, for fractional hold up of gas = 0.1 and gas bubble diameter = 0.5 mm is given by (in m²/m³)