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 5 of 11

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Q41.
When the height of an aerated bioreactor is increased, it will increase the oxygen transfer rate by

a.

increasing the partial pressure of oxygen at the base of the reactor

b.

decreasing the saturation concentration of oxygen in the reactor

c.

decreasing the gas-holdup

d.

all of the above

Discuss
Answer: (a).increasing the partial pressure of oxygen at the base of the reactor
Q42.
Which of the following is correct for the off-centre impellers?

a.

Off-centre impellers can be used with any size reactor

b.

Off-centre impellers should only be used with reactors with volumes less than 10 m3

c.

The impeller should never be placed in an off-centre position

d.

Off-centre impellers can be used when volume is greater than 10 m3

Discuss
Answer: (b).Off-centre impellers should only be used with reactors with volumes less than 10 m3
Q43.
The power required by an impeller in a gas sparged system compare to the power required by impeller operating at same speed in a gas free liquid is usually

a.

lesser

b.

higher

c.

same

d.

may be lesser or higher depending upon the geometry

Discuss
Answer: (a).lesser
Q44.
Which of the following stirrer requires least amount of energy for same yield?

a.

Mig

b.

Intermig

c.

Turbine

d.

Disc

Discuss
Answer: (b).Intermig
Q45.
A reactor has a total volume of 50,000 litres. If it has a headspace volume of 10,000 litres, then volume of liquid in the reactor will be

a.

10,000 l

b.

20,000 l

c.

30,000 l

d.

40,000 l

Discuss
Answer: (d).40,000 l
Q46.
A cylindrical reactor fitted with Rushton Turbine has a liquid volume of 100,000 litres. It has an aspect ratio (the ratio of the channel height to the width) of 2:1. The diameter of the impeller should be approximately:

a.

1.3 m

b.

3.3 m

c.

5.3 m

d.

7.3 m

Discuss
Answer: (a).1.3 m
Q47.
In the bubble boundary layer, oxygen concentration can be determined by measuring

a.

the steady state oxygen concentration in a mixed aerated reactor before inoculation

b.

the steady state oxygen concentration in a mixed aerated reactor after inoculation

c.

the steady state oxygen concentration in the boundary layer using a micro-probe

d.

volume of oxygen supplied

Discuss
Answer: (a).the steady state oxygen concentration in a mixed aerated reactor before inoculation
Q48.
Impeller damage can be minimized by

a.

using specially designed axial flow impellers

b.

using radial flow impellers

c.

using Intermig impellers

d.

all of the above

Discuss
Answer: (a).using specially designed axial flow impellers
Q49.
To increase the oxygen transfer rate in a shake flask culture system, which of the following (s) is/are followed?

a.

Liquid volume in the flask is reduced

b.

Stirrer speed is increased

c.

Baffled flasks are used

d.

All of the above

Discuss
Answer: (d).All of the above
Q50.
What is/are the major difference(s) between disc and turbine type stirrer?

a.

Blades in disc type are projected out beyond the edge of disc while blades are curved one in turbine type

b.

Turbine type requires 50 % less air than disc type for the same yield and energy consumption

c.

Both (a) and (b)

d.

Number of blades in the stirrer

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