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 8 of 11

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Q71.
Which of the following is not classified as an axial flow impeller?

a.

A propeller

b.

A marine impeller

c.

A Rushton turbine

d.

A hydrofoil impeller

Discuss
Answer: (c).A Rushton turbine
Q72.
Power number (Np) is also known as

a.

Froude's number

b.

Bond's number

c.

Newton's number

d.

Rayleigh's number

Discuss
Answer: (c).Newton's number
Q73.
Flooding is a condition/phenomenon which occur in a bioreactor when

a.

The air escapes without being distributed by the agitator

b.

The fermenter medium spills out the reactor due to foaming

c.

The volume of foam is more than the volume of broth

d.

None of the above

Discuss
Answer: (a).The air escapes without being distributed by the agitator
Q74.
A cylindrical reactor has a liquid volume of 100,000 litres. It has an aspect ratio the ratio of the channel height to width of 1:1. The height of the liquid in the reactor will be approximately:

a.

1.0 m

b.

3.0 m

c.

5.0 m

d.

7.0 m

Discuss
Answer: (c).5.0 m
Q75.
Detergent like substances produced by microorganisms during a fermentation will lead to

a.

decrease the surface tension of the liquid

b.

accumulate at the gas liquid interface

c.

decrease the rate of bubble coalescence

d.

all of the above

Discuss
Answer: (d).all of the above
Q76.
In the design of a paddle agitator, the ratio of paddle diameter to tank diameter is normally taken as

a.

0.1

b.

0.8

c.

0.25

d.

0.5

Discuss
Answer: (b).0.8
Q77.
The oxygen absorption rate can be determined by

a.

sodium sulfite oxidation method

b.

dynamic gassing out technique

c.

direct measurement

d.

all of these

Discuss
Answer: (d).all of these
Q78.
Industrial paddle agitators turn at the speed of

a.

20 and 150 rpm

b.

150 and 300 rpm

c.

400 and 800 rpm

d.

1150 rpm

Discuss
Answer: (a).20 and 150 rpm
Q79.
The dynamic technique is based on the

a.

oxygen material balance in an aerated batch fermenter during the growth of microorganisms

b.

change of the oxygen concentration

c.

oxidation of the sodium sulfite to sodium sulfate

d.

oxygen material balance in a fermenter

Discuss
Answer: (a).oxygen material balance in an aerated batch fermenter during the growth of microorganisms
Q80.
The addition of antifoams to an aerated bioreactor will decrease oxygen transfer rates because antifoams

a.

increase the tendency of bubbles to coalesce

b.

tend to accumulate in the gas liquid interface

c.

reduce the surface tension of the liquid

d.

All of the above answers

Discuss
Answer: (d).All of the above answers
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