Chemical Engineering - Mass Transfer

16. 

Pick out the wrong statement.

A. Critical moisture content is not a property of the material itself.
B. A sharp increase in pressure drop gives an indication of the flooding in a distillation column.
C. Separation of components is not possible in liquid extraction, if selectivity is unity.
D. Dehydration of ethyl alcohol is most economically done by molecular distillation at very high vacuum.

Answer: Option D

Explanation:

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17. 

Only small amount of evaporation of water produces large cooling effects because of its

A. large latent heat
B. low viscosity
C. small latent heat
D. none of these

Answer: Option A

Explanation:

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18. 

The most common packing used in industrial operations is __________ rings.

A. raschig
B. lessing
C. cross-partition
D. single spiral

Answer: Option A

Explanation:

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19. 

When the feed to a distillation column is a saturated liquid, slope of the feed line is

A. zero
B. unity
C. infinity
D. none of these

Answer: Option C

Explanation:

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20. 

Leaching of sugar from sugar beets is done by

A. hot water
B. hexane
C. dilute H2SO4
D. lime water

Answer: Option A

Explanation:

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