Chemical Engineering - Mass Transfer

41. 

Which of the following liquid-vapor contacting devices provides maximum contact surface area for a particular duty ?

A. Sieve plate column
B. Bubble cap column
C. Randomly packed column
D. Wetted wall column

Answer: Option D

Explanation:

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42. 

The equipment frequently used for adiabatic humidification-cooling operation with recirculating liquid is

A. natural draft cooling tower
B. induced draft cooling tower
C. spray chamber
D. none of these

Answer: Option C

Explanation:

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43. 

Chemisorption (chemical adsorption) is

A. same as "Van der Waals" adsorption.
B. characterised by adsorption of heat.
C. an irreversible phenomenon.
D. a reversible phenomenon.

Answer: Option C

Explanation:

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44. 

The rate of solid-liquid extraction is limited by the

A. phase change of the solute as it dissolves in the solvent.
B. diffusion of the solute through the solvent in the pores to the outside of the particle.
C. diffusion of the solute from the solution in contact with the particle to the main bulk of the solution.
D. all 'a', 'b' & 'c'.

Answer: Option D

Explanation:

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45. 

Raoult's law applies to the

A. all liquid solutions
B. non-ideal solution only.
C. non-volatile solute.
D. solvents.

Answer: Option D

Explanation:

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