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 7 of 11

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Q61.
Turbulent flow range of mixing speed is obtained for

a.

Rei<10

b.

10<Rei<10⁴

c.

Rei>10⁴

d.

None of these

Discuss
Answer: (c).Rei>10⁴
Q62.
For laminar 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(Rei)

d.

Np = KNDi(Rei)­²

Discuss
Answer: (a).Np = K(Rei)­¹
Q63.
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
Q64.
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
Q65.
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)
Q66.
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
Q67.
Which of the following model holds correct for the two-film theory? (where KL is the mass transfer coefficient, DAB diffusivity and Zf film thickness)

a.

KL = DAB/Zf

b.

KL = DAB

c.

KL = Zf/DAB

d.

KL = DAB.Zf

Discuss
Answer: (a).KL = DAB/Zf
Q68.
Froude number is avoided in calculation of power requirements for low viscosity liquid mixing systems when

a.

baffled systems are used

b.

Reynolds number is less than 300

c.

both (a)and(b)

d.

none of these

Discuss
Answer: (c).both (a)and(b)
Q69.
A fermentation system has a KLa of 3 s­¹ and a C0* of 5 ppm of O₂. If the bulk liquid is completely depleted of oxygen, then the oxygen transfer rate will be equal to

a.

zero

b.

15 mg.l­¹.s­¹

c.

10 mg.l­¹.s­¹

d.

5 mg.l­¹.s­¹

Discuss
Answer: (b).15 mg.l­¹.s­¹
Q70.
During fermentation, the saturation concentration of oxygen was reduced from 7 ppm. to 1 ppm. Which one of the following conclusions can be drawn?

a.

Microbial growth is oxygen limited since the oxygen concentration is lesser than the saturation concentration

b.

Microbial growth is not oxygen limited since the oxygen concentration is lesser than the saturation concentration

c.

Experimental error leads to the reduction

d.

No conclusion can be drawn

Discuss
Answer: (d).No conclusion can be drawn
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