Mass Transfer MCQ Questions and Answers | Chemical Engineering | page 50

Mass Transfer
An alkaline solution is used to reduce the concentration of carbon dioxide in a stream from 10% to 0.1% by absorption with irreversible chemical reaction. The overall number of transfer units based on gas phase is

0.001

100

9.21

4.605

0.001

100

9.21

4.605

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Mass Transfer
For a distillation column operating at minimum reflux, the

Concentration of liquid and vapour leaving a plate will be same

None of these

Number of plates required will be maximum

Reflux ratio will be maximum

Concentration of liquid and vapour leaving a plate will be same

None of these

Number of plates required will be maximum

Reflux ratio will be maximum

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Mass Transfer
The wet and 'dry bulb temperature for a vapour-gas mixture are 25°C and 30°C respectively. If the mixture is heated to 45°C at constant pressure, the wet bulb temperature will be __________ °C.

25

-25

< 25

> 25

25

-25

< 25

> 25

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Mass Transfer
The Kundsen diffusivity is proportional to (where, T = absolute temperature)

T²

T⁴

T

√T

T²

T⁴

T

√T

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Mass Transfer
Pick out the wrong statement pertaining to the rotary dryer.

Hold up of a rotary drier is defined as the fraction of the dryer volume occupied by the solid at any instant. The best performance for rotary drier is obtained, when the hold up is in the range of 0.

Recommended peripherial speed of a rotary drier is in the range of 10 to 30 metres/minute

Flights (located in the inside shell of rotary dryer) lift the material being dried and shower it down through the current of hot air/gases. It extends from the wall to a distance which is about 8-12%

Rotary dryer is suitable for drying sticky material

Hold up of a rotary drier is defined as the fraction of the dryer volume occupied by the solid at any instant. The best performance for rotary drier is obtained, when the hold up is in the range of 0.

Recommended peripherial speed of a rotary drier is in the range of 10 to 30 metres/minute

Flights (located in the inside shell of rotary dryer) lift the material being dried and shower it down through the current of hot air/gases. It extends from the wall to a distance which is about 8-12%

Rotary dryer is suitable for drying sticky material

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MASS TRANSFER

Mass Transfer An alkaline solution is used to reduce the concentration of carbon dioxide in a stream from 10% to 0.1% by absorption with irreversible chemical reaction. The overall number of transfer units based on gas phase is

Mass Transfer For a distillation column operating at minimum reflux, the

Mass Transfer The wet and 'dry bulb temperature for a vapour-gas mixture are 25°C and 30°C respectively. If the mixture is heated to 45°C at constant pressure, the wet bulb temperature will be __________ °C.

Mass Transfer The Kundsen diffusivity is proportional to (where, T = absolute temperature)

Mass Transfer Pick out the wrong statement pertaining to the rotary dryer.

Mass Transfer
An alkaline solution is used to reduce the concentration of carbon dioxide in a stream from 10% to 0.1% by absorption with irreversible chemical reaction. The overall number of transfer units based on gas phase is

Mass Transfer
For a distillation column operating at minimum reflux, the

Mass Transfer
The wet and 'dry bulb temperature for a vapour-gas mixture are 25°C and 30°C respectively. If the mixture is heated to 45°C at constant pressure, the wet bulb temperature will be __________ °C.

Mass Transfer
The Kundsen diffusivity is proportional to (where, T = absolute temperature)

Mass Transfer
Pick out the wrong statement pertaining to the rotary dryer.