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!

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Agitation and Aeration MCQs | Page 2 of 11

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Q11.
For turbulent flow, Reynolds number is correlated with power number as (where K, a constant which depends on the container geometry and shape of stirrer; Rei, is Reynolds number for agitator; Di, stirrer diameter and N, stirrer speed)

a.

Np = K(Rei)­¹

b.

Np = N2Di(Rei)­¹

c.

Np = K

d.

Can't be correlated

Discuss
Answer: (c).Np = K
Q12.
In a bioreactor, if at a particular time the oxygen transfer rate is 23 kg.h­¹, then the oxygen uptake will be

a.

23 kg.h­¹

b.

less than 23 kg.h­¹

c.

greater than 23 kg.h­¹

d.

2.3 kg.h­¹

Discuss
Answer: (a).23 kg.h­¹
Q13.
In a two-phase system where the continuous phase remains in place, the gas hold up can be expressed as (where Vs and Vt are the superficial gas velocity and bubble rise velocity)

a.

H = Vs/(Vs-Vt)

b.

H = Vs/(Vs+ Vt)

c.

H = Vs/(Vs.Vt)

d.

H = (Vs+Vt)/Vs

Discuss
Answer: (b).H = Vs/(Vs+ Vt)
Q14.
What is the effect of the concentration of dissolved salts and sugars on the oxygen transfer rate?

a.

The saturation concentration of oxygen in the medium decreases with the concentration of dissolved salts and sugars, leading to a lower oxygen transfer rate

b.

The KLa of the medium decreases with the concentration of dissolved salts and sugars, leading to a lower oxygen transfer rate

c.

The KLa of the medium increases with the concentration of dissolved salts and sugars, leading to a lower oxygen transfer rate

d.

None of the above

Discuss
Answer: (a).The saturation concentration of oxygen in the medium decreases with the concentration of dissolved salts and sugars, leading to a lower oxygen transfer rate
Q15.
Turbine impeller consists of flat impeller blades with

a.

a vertical pitch welded directly to the shaft

b.

a angled pitch welded directly to the shaft

c.

a vertical pitch welded to a horizontal disk

d.

a angled pitch welded to a horizontal disk

Discuss
Answer: (c).a vertical pitch welded to a horizontal disk
Q16.
An aerated bioreactor will increase oxygen transfer rates with the addition of detergents because it

a.

enhances bubble coalescence

b.

causes bubbles to expand

c.

discourages bubble coalescence

d.

increases the surface tension of the liquid

Discuss
Answer: (c).discourages bubble coalescence
Q17.
Vortexing in stirred tank reactors can be prevented by

a.

installing baffles in the reactor

b.

shifting the impeller to an off-centre position

c.

Both (a) and (b)

d.

using axial flow impellers

Discuss
Answer: (c).Both (a) and (b)
Q18.
Which of the following would be best described as an axial flow impeller?

a.

An impeller with blades pitched at 45° to the vertical

b.

An impeller which directs liquid flow towards the base of the reactor

c.

Both (a) and (b)

d.

An impeller with blades pitched at 75° to the vertical

Discuss
Answer: (c).Both (a) and (b)
Q19.
Henry's law relates

a.

the partial pressure of oxygen and the saturation concentration of oxygen in the liquid

b.

the oxygen transfer rate and the bubble size

c.

the oxygen transfer rate and the temperature

d.

the oxygen transfer rate to the partial pressure of oxygen in the liquid

Discuss
Answer: (a).the partial pressure of oxygen and the saturation concentration of oxygen in the liquid
Q20.
The reason of using a flat disk in a Turbine is

a.

to create high shear conditions

b.

to break up bubbles more efficiently than the impeller blades

c.

to ensure that the bulk of the energy consumption occurs at the blades

d.

all of the above

Discuss
Answer: (c).to ensure that the bulk of the energy consumption occurs at the blades
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