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 6 of 11

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Q51.
The volume of liquid (VL) in a cylindrical reactor can be calculated from the liquid height (HL) and tank diameter (Dt) using the following equation

a.

VL = 4/3 x ฯ€ x HL x Dt³/8

b.

VL= HL x ฯ€ x Dt²/4

c.

VL= HL x ฯ€ x Dt²

d.

VL = 4 x ฯ€ x Dt²

Discuss
Answer: (b).VL= HL x ฯ€ x Dt²/4
Q52.
The average fractional gas hold up (H) can be given as (where Zf and Zl are the level of aerated and clear liquid respectively)

a.

H = (Zf-Zl)/Zf

b.

H = Zf/Zl

c.

H = Zf/ZfZl

d.

H =(Zf+Zl)/Zf

Discuss
Answer: (a).H = (Zf-Zl)/Zf
Q53.
Which of the following(s) is/are non-mechanically agitated reactors?

a.

Stirrer tank reactor

b.

Bubble column

c.

Air lift reactor

d.

Both (b) and (c)

Discuss
Answer: (d).Both (b) and (c)
Q54.
Which of the following best explains the reasons for using axial flow impellers in crystallization and precipitation reactions?

a.

Crystal and precipitates are not too small, so as to ensure easy separation of the solids from the mother liquor

b.

Crystals and precipitates are thoroughly broken down, so as to ensure easy separation of the solids from the mother liquor

c.

Both (a) and (b)

d.

Axial flow impellers provide low shear, energy efficient mixing conditions

Discuss
Answer: (a).Crystal and precipitates are not too small, so as to ensure easy separation of the solids from the mother liquor
Q55.
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
Q56.
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
Q57.
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
Q58.
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
Q59.
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
Q60.
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
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