Chemical Engineering - Mass Transfer

16. 

Drying operation under vacuum is carried out to

A. dry those materials which have very high unbound mositure content.
B. reduce drying temperature.
C. increase drying temperature.
D. dry materials having high bound moisture content.

Answer: Option B

Explanation:

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17. 

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

A. higher dew point.
B. higher absolute (specific) humidity.
C. higher relative humidity
D. higher wet bulb temperature.

Answer: Option C

Explanation:

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18. 

Separation of two or more components of a liquid solution can not be achieved by

A. fractional crystallisation
B. liquid extraction
C. absorption
D. evaporation

Answer: Option C

Explanation:

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19. 

Stefan's law describes the mass transfer by

A. diffusion
B. bulk flow
C. both 'a' & 'b'
D. neither 'a' nor 'b'

Answer: Option C

Explanation:

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20. 

At minimum reflux ratio for a given separation

A. number of plates is zero.
B. number of plates is infinity.
C. minimum number of the theoretical plates is required.
D. separation is most efficient.

Answer: Option B

Explanation:

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