Mass Transfer - Section 1

Directions to Solve

Mass Transfer - Section 1

Mass transfer is a field and if you are interested to test your aptitude level
then you can find the MCQs in this section and can solve them easily.

1.

Mass transfer co-efficient (K) and diffusivity (D) are related according to film theory as

A.	K ∝ D
B.	K ∝√D
C.	K ∝ D1.5
D.	K ∝ D2

Answer: Option A

Explanation:

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2.

Low viscosity absorbent is preferred for reasons of

A.	rapid absorption rates and good heat transfer characteristics.
B.	improved flooding characteristics.
C.	low pressure drop on pumping.
D.	all (a), (b) and (c).

Answer: Option D

Explanation:

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3.

With increase in pressure, the relative volatility for a binary system

A.	increases.
B.	decreases.
C.	remains same.
D.	either (a) or (b), depends on the system.

Answer: Option B

Explanation:

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4.

In distillation, overhead product contains

A.	only one component
B.	two components
C.	any number of components
D.	only saturated liquid

Answer: Option C

Explanation:

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5.

In distillation columns, the number of bubble caps per tray primarily depends upon the

A.	allowable liquid velocity.
B.	allowable gas velocity.
C.	allowable gas and liquid velocities.
D.	feed composition.

Answer: Option C

Explanation:

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6.

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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7.

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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8.

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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