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

10

9

1

8

10

9

1

8

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Mass Transfer
Humidity chart is useful for the solution of problems concerning condensation, vaporisation and air conditioning. At a given dry bulb temperature, value of humidity obtained from the humidity chart directly, is in terms of __________ humidity.

Percentage

Relative

None of these

Molal

Percentage

Relative

None of these

Molal

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Mass Transfer
Water-ethyl alcohal solution can be concentrated (in respect of alcohal concentration) by __________ distillation.

None of these

High pressure

Atmospheric

Vacuum

None of these

High pressure

Atmospheric

Vacuum

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Mass Transfer
Schimdt number and Lewis number for pure air at atmospheric conditions are respectively

0 and ≈ 1

< 1 and ≈ 1

>1 and ≈ 1

1 and 0

0 and ≈ 1

< 1 and ≈ 1

>1 and ≈ 1

1 and 0

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Mass Transfer
To get high tray efficiency

Liquid entrainment should be severe

Interfacial surface between liquid and gas phase should be large

Time of contact between the two phases should be less

Gas velocity should be very low

Liquid entrainment should be severe

Interfacial surface between liquid and gas phase should be large

Time of contact between the two phases should be less

Gas velocity should be very low

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Mass Transfer
At constant pressure, with increase of temperature, the dew point will

Increase

Increase/decrease ; depends on the temperature

Remain unchanged

Decrease

Increase

Increase/decrease ; depends on the temperature

Remain unchanged

Decrease

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Mass Transfer

Mass Transfer Humidity chart is useful for the solution of problems concerning condensation, vaporisation and air conditioning. At a given dry bulb temperature, value of humidity obtained from the humidity chart directly, is in terms of __________ humidity.

Mass Transfer Water-ethyl alcohal solution can be concentrated (in respect of alcohal concentration) by __________ distillation.

Mass Transfer Schimdt number and Lewis number for pure air at atmospheric conditions are respectively

Mass Transfer To get high tray efficiency

Mass Transfer At constant pressure, with increase of temperature, the dew point will

Mass Transfer
Humidity chart is useful for the solution of problems concerning condensation, vaporisation and air conditioning. At a given dry bulb temperature, value of humidity obtained from the humidity chart directly, is in terms of __________ humidity.

Mass Transfer
Water-ethyl alcohal solution can be concentrated (in respect of alcohal concentration) by __________ distillation.

Mass Transfer
Schimdt number and Lewis number for pure air at atmospheric conditions are respectively

Mass Transfer
To get high tray efficiency

Mass Transfer
At constant pressure, with increase of temperature, the dew point will