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 9 of 67

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Q81.
Pick out the wrong statement pertaining to the rotary dryer.

a.

Flights (located in the inside shell of rotary dryer) lift the material being dried and shower it down through the current of hot air/gases. It extends from the wall to a distance which is about 8-12% of the inside diameter of shell.

b.

Hold up of a rotary drier is defined as the fraction of the dryer volume occupied by the solid at any instant. The best performance for rotary drier is obtained, when the hold up is in the range of 0.05 to 0.15.

c.

Rotary dryer is suitable for drying sticky material.

d.

Recommended peripherial speed of a rotary drier is in the range of 10 to 30 metres/minute.

Discuss
Answer: (c).Rotary dryer is suitable for drying sticky material.
Q82.
Pick out the correct statement.

a.

Bound moisture is removed during constant rate drying period.

b.

Free moisture is removed during falling rate drying period.

c.

The sum of free moisture and equilibrium moisture in a solid is called the critical moisture.

d.

The driving force for mass transfer in a wet solid is its free moisture content.

Discuss
Answer: (d).The driving force for mass transfer in a wet solid is its free moisture content.
Q83.
Very tall packed towers are divided into series of beds to

a.

reduce the overall pressure drop

b.

avoid channelling

c.

reduce liquid hold-up

d.

avoid flooding

Discuss
Answer: (b).avoid channelling
Q84.
Moisture contained by a substance in excess of the equilibrium moisture is called the __________ moisture.

a.

unbound

b.

free

c.

critical

d.

bound

Discuss
Answer: (b).free
Q85.
With increase in temperature, the solubility of gases in liquids, at fixed pressure

a.

increases

b.

decreases

c.

remains same

d.

either (a) or (b), depends on the system

Discuss
Answer: (b).decreases
Q86.
In most of the vacuum crystalliser, vacuum is generally produced by means of a

a.

suction pump

b.

compressed air jet

c.

steam jet ejector with a barometric condenser

d.

none of these

Discuss
Answer: (c).steam jet ejector with a barometric condenser
Q87.
In case of binary distillation, increasing the reflux ratio above optimum does not result in the increase of

a.

area between operating line and 45° diagonal x-y diagram.

b.

condenser and reboiler surfaces.

c.

tower cross-section.

d.

none of these.

Discuss
Answer: (a).area between operating line and 45° diagonal x-y diagram.
Q88.
Wetted wall tower experiment determines the

a.

molal diffusivity.

b.

volumetric co-efficient.

c.

mass transfer co-efficient.

d.

none of these.

Discuss
Answer: (c).mass transfer co-efficient.
Q89.
In McCabe-Thiele method, at infinite reflux ratio

a.

the overhead product is minimum.

b.

both the operating lines coincide with diagonal.

c.

both (a) and (b).

d.

neither (a) nor (b).

Discuss
Answer: (a).the overhead product is minimum.
Q90.
With decrease in the throughput (compared with the design capacity) for a bubble cap distillation column, its efficiency

a.

increases

b.

decreases

c.

remains same

d.

may increase or decrease ; depends on individual design

Discuss
Answer: (a).increases
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