Agitation and Aeration MCQs

Welcome to our comprehensive collection of Multiple Choice Questions (MCQs) on Agitation and Aeration, a fundamental topic in the field of Biochemical Engineering. Whether you're preparing for competitive exams, honing your problem-solving skills, or simply looking to enhance your abilities in this field, our Agitation and Aeration 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 Agitation and Aeration mcq questions that explore various aspects of Agitation and Aeration problems. Each MCQ is crafted to challenge your understanding of Agitation and Aeration principles, enabling you to refine your problem-solving techniques. Whether you're a student aiming to ace Biochemical Engineering tests, a job seeker preparing for interviews, or someone simply interested in sharpening their skills, our Agitation and Aeration MCQs are your pathway to success in mastering this essential Biochemical Engineering topic.

Note: Each of the following question comes with multiple answer choices. Select the most appropriate option and test your understanding of Agitation and Aeration. 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 Agitation and Aeration knowledge to the test? Let's get started with our carefully curated MCQs!

Agitation and Aeration MCQs | Page 3 of 11

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Q21.
Which of the following is not considered among the three best-known theories of interphase mass transfer?

a.

two-film theory

b.

penetration theory

c.

surface renewal theory

d.

Calderbank and Moo-Young theory

Discuss
Answer: (d).Calderbank and Moo-Young theory
Q22.
Which of the following is most likely to cause an increase in the rate of oxygen transfer into a particular aerated fermentation system?

a.

Addition of antifoams

b.

Increase in temperature

c.

Increase in stirrer speed

d.

Both (a) and (b)

Discuss
Answer: (c).Increase in stirrer speed
Q23.
At 25°C, the saturation concentration of oxygen in water is 1.26 mmol/l and the partial pressure of oxygen is 1 atm. The Henry's law constant will be

a.

0.793atml/mmol

b.

0.207atml/mmol

c.

1.26 atml/mmol

d.

8.74 atml/mmol

Discuss
Answer: (a).0.793atml/mmol
Q24.
Gas hold up, characterizing the hydrodynamics in a fermenter, mainly depends on the

a.

superficial gas velocity

b.

power consumption

c.

Both (a) and (b)

d.

gas concentration

Discuss
Answer: (c).Both (a) and (b)
Q25.
Which of the following will have the highest surface area available for oxygen transfer?

a.

A shake flask

b.

A standing test tube

c.

A non-sparged stirred tank reactor agitated at 400 rpm

d.

A sparged stirred tank reactor agitated at 400 rpm

Discuss
Answer: (d).A sparged stirred tank reactor agitated at 400 rpm
Q26.
A flooded impeller will lead to poor oxygen transfer rates because

a.

bubbles tend to coalesce under the impeller

b.

bubbles tend to break down too rapidly under high shear conditions

c.

bubbles tend to move too quickly through the bulk liquid

d.

the cells clog up the surface of the bubble

Discuss
Answer: (a).bubbles tend to coalesce under the impeller
Q27.
Power consumption by agitation is

a.

a function of physical properties

b.

a function of operating conditions

c.

a function of vessel and impeller geometry

d.

all of the above

Discuss
Answer: (d).all of the above
Q28.
Which of the following impellers will provide radial flow?

a.

Paddles

b.

Flat blade turbines

c.

Disk flat blade turbines

d.

All of the above

Discuss
Answer: (d).All of the above
Q29.
When liquid is pumped through cooling coil in a stirred tank reactor to cool. Which of the following is not correct?

a.

If the stirrer speed is increased, the rate will be faster

b.

Baffles in the tank will increase the rate of cooling

c.

Faster cooling rates at a slower rate of pumping

d.

Faster cooling rates at a faster rate of pumping

Discuss
Answer: (c).Faster cooling rates at a slower rate of pumping
Q30.
Swirling and vortex formation can be prevented by

a.

using baffles

b.

using diffusion ring with turbines

c.

both (a) and (b)

d.

none of these

Discuss
Answer: (c).both (a) and (b)
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