Chemical Engineering - Mass Transfer

1. 

__________ is used as an 'entrainer' for the separation of acetic acid-water mixture by distillation.

A. Furfural
B. Benzol
C. Butyl acetate
D. Hexane

Answer: Option C

Explanation:

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2. 

Rotary dryers cannot handle __________ materials.

A. free flowing
B. dry
C. sticky
D. grannular

Answer: Option C

Explanation:

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3. 

Pick out the correct statement.

A. Diffusivity decreases with increase in temperature.
B. Diffusivity increases with increase in molecular weight.
C. Diffusivity increases with the size of the individual molecule.
D. none of these.

Answer: Option D

Explanation:

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4. 

An example of elutioh is

A. separation of uranium oxide from its ore by H2SO4 in a Pachuca tank.
B. separation of sugar from sugar beet by hot water.
C. dissolution of tannin out of tree barks by water.
D. recovery of vegetable oils from seeds.

Answer: Option A

Explanation:

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5. 

The operating line for an absorber is curved, when plotted in terms of

A. mole fractions
B. mole ratios
C. partial pressure
D. mass fractions

Answer: Option C

Explanation:

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