Mass Transfer MCQs

Welcome to our comprehensive collection of Multiple Choice Questions (MCQs) on Mass Transfer, a fundamental topic in the field of Basic Chemical Engineering. Whether you're preparing for competitive exams, honing your problem-solving skills, or simply looking to enhance your abilities in this field, our Mass Transfer MCQs are designed to help you grasp the core concepts and excel in solving problems.

In this section, you'll find a wide range of Mass Transfer mcq questions that explore various aspects of Mass Transfer problems. Each MCQ is crafted to challenge your understanding of Mass Transfer principles, enabling you to refine your problem-solving techniques. Whether you're a student aiming to ace Basic Chemical Engineering tests, a job seeker preparing for interviews, or someone simply interested in sharpening their skills, our Mass Transfer MCQs are your pathway to success in mastering this essential Basic Chemical Engineering topic.

Note: Each of the following question comes with multiple answer choices. Select the most appropriate option and test your understanding of Mass Transfer. You can click on an option to test your knowledge before viewing the solution for a MCQ. Happy learning!

So, are you ready to put your Mass Transfer knowledge to the test? Let's get started with our carefully curated MCQs!

Mass Transfer MCQs | Page 17 of 67

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Q161.
Absorption factor method is used to calculate the number of ideal stages, when

a.

operating line lies above the equilibrium line.

b.

operating line lies below the equilibrium line.

c.

both operating and equilibrium lines are parallel.

d.

pressure drop in the column is very high.

Discuss
Answer: (c).both operating and equilibrium lines are parallel.
Q162.
Flights in a rotary dryer are provided to

a.

lift and shower the solids thus exposing it thoroughly to the drying action of the gas.

b.

reduce the residence time of solid.

c.

increase the residence time of the solid.

d.

none of these.

Discuss
Answer: (a).lift and shower the solids thus exposing it thoroughly to the drying action of the gas.
Q163.
If the solubilities of different components (in a liquid-liquid extraction system) increase with rise in temperature, then the temperature above which they dissolve completely is known as the critical solution temperature (CST or consolute temperature). If solubilities increase with decrease in temperature, then CST is the temperature below which they dissolve completely. If a binary system has no critical solution temperature, it implies that

a.

the system comprises of partially mis-cible liquids.

b.

the system comprises of miscible liquids.

c.

the system comprises of an azeotrope.

d.

on heating, a vapor phase will appear ; while on cooling, a solid phase will appear.

Discuss
Answer: (d).on heating, a vapor phase will appear ; while on cooling, a solid phase will appear.
Q164.
The rate of mass transfer is not dependent upon the

a.

degree of dispersion of one fluid in the other.

b.

interfacial surface exposed between the phases.

c.

both (a) & (b).

d.

none of these.

Discuss
Answer: (d).none of these.
Q165.
On moving the feed line (q-line) from saturated liquid feed (vertical position) to saturated vapor feed (horizontal feed), if the slope of both the operating lines are to be increased, then it will result in

a.

greater degree of separation with a fixed number of trays

b.

increased reboiler load

c.

increased reflux ratio

d.

None of these.

Discuss
Answer: (c).increased reflux ratio
Q166.
__________ column is the most suitable for achieving the best performance for mass transfer operations involving liquid with dispersed solids.

a.

Watted wall

b.

Packed

c.

Plate

d.

Spray

Discuss
Answer: (c).Plate
Q167.
Deairation (removal of O₂) of water is done by

a.

rectification

b.

absorption

c.

ion-exchange

d.

adsorption

Discuss
Answer: (c).ion-exchange
Q168.
Make up water is supplied during cooling tower operation to compensate for water losses due to

a.

evaporation

b.

blowdown

c.

entrainment

d.

all (a), (b)&(c)

Discuss
Answer: (d).all (a), (b)&(c)
Q169.
Pick out the wrong statement.

a.

The mole fraction of solute is directly proportional to the molality of a 'dilute' solution.

b.

For a non-reacting binary mixture of ideal gases, the partial pressure distribution of both components is nonlinear in the case of steady state unimolal unidirectional diffusion.

c.

Azeotropes obey Raoult's law at all temperature.

d.

The relative volatility of a binary mixture at the azeotropic composition is 1.

Discuss
Answer: (c).Azeotropes obey Raoult's law at all temperature.
Q170.
The Kundsen diffusivity is proportional to (where, T = absolute temperature)

a.

√T

b.

T²

c.

T

d.

T⁴

Discuss
Answer: (a).√T
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