Which of the following psychrometric processes is followed by water vapour laden unsaturated air, when it is passed through solid or liquid adsorbent?

Mass Transfer
Which of the following psychrometric processes is followed by water vapour laden unsaturated air, when it is passed through solid or liquid adsorbent?

None of these

Dehumidification with dry bulb temperature remaining constant

Heating and dehumidification at almost constant wet bulb temperature

Cooling and dehumidification

None of these

Dehumidification with dry bulb temperature remaining constant

Heating and dehumidification at almost constant wet bulb temperature

Cooling and dehumidification

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Mass Transfer
With increase in gas rate, the number of transfer units, NtoG, for a fixed degree of absorption by a fixed amount of solvent

Increases

Remains unaffected

Decreases

Decreases linearly

Increases

Remains unaffected

Decreases

Decreases linearly

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Mass Transfer
At equilibrium the concentration of water in vapour phase (C)in kg/m³ of air space and the amount of water (m) adsorbed per kg of dry silica gel are related by, C = 0.0667m. To maintain dry conditions in a room of air space 100m³ containing 2.2 kg of water vapour initially, 10 kg of dry silica gel is kept in the room. The fraction of initial water remaining in the air space after a long time (during which the temperature is maintained constant) is

0.2

0.4

1

0.2

0.4

1

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Mass Transfer
The value of NA/(NA + NB) for steady state molecular diffusion of gas 'A' through non-diffusing gas 'B' is

∞

2

1

0.5

∞

2

1

0.5

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

>1 and ≈ 1

1 and 0

0 and ≈ 1

< 1 and ≈ 1

>1 and ≈ 1

1 and 0

0 and ≈ 1

< 1 and ≈ 1

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Mass Transfer
A solid material shows case hardening properties while drying. Which of the following should be controlled to control the drying process?

Temperature of the solid

Relative humidity of outlet air

Humidity of inlet air

Flow rate of inlet air

Temperature of the solid

Relative humidity of outlet air

Humidity of inlet air

Flow rate of inlet air

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Mass Transfer

Mass Transfer Which of the following psychrometric processes is followed by water vapour laden unsaturated air, when it is passed through solid or liquid adsorbent?

Mass Transfer With increase in gas rate, the number of transfer units, NtoG, for a fixed degree of absorption by a fixed amount of solvent

Mass Transfer The value of NA/(NA + NB) for steady state molecular diffusion of gas 'A' through non-diffusing gas 'B' is

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

Mass Transfer A solid material shows case hardening properties while drying. Which of the following should be controlled to control the drying process?

Mass Transfer
Which of the following psychrometric processes is followed by water vapour laden unsaturated air, when it is passed through solid or liquid adsorbent?

Mass Transfer
With increase in gas rate, the number of transfer units, NtoG, for a fixed degree of absorption by a fixed amount of solvent

Mass Transfer
The value of NA/(NA + NB) for steady state molecular diffusion of gas 'A' through non-diffusing gas 'B' is

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

Mass Transfer
A solid material shows case hardening properties while drying. Which of the following should be controlled to control the drying process?