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 10 of 11

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Q91.
If the stirring speed increased from 300 to 500 rpm leads to an increase in the reaction rate by two folds. Then it may be concluded that

a.

the reaction was mass transfer limited at 300 rpm

b.

the reaction was mass transfer limited at 500 rpm

c.

the reaction did not involve any mass transfer step

d.

the movement of molecules in the reactor at 300 rpm occurred due to diffusion alone

Discuss
Answer: (a).the reaction was mass transfer limited at 300 rpm
Q92.
An increase in the heat transfer in the stirred tank reactor will be observed at

a.

higher cooling water temperature

b.

higher stirrer speed

c.

the removal of baffles from the reactor

d.

slower stirrer speed

Discuss
Answer: (b).higher stirrer speed
Q93.
The effect of increasing the stirrer speed in an unbaffled stirred tank reactor is that

a.

a small increase in stirrer speed will cause the liquid to enter the turbulent flow regime

b.

as the stirrer speed increases, the liquid will continue to circulate and then become turbulent

c.

as the stirrer speed increases, the liquid will continue to circulate. Eventually a vortex will form.

d.

A vortex will form at low stirrer speeds. As the stirrer speed increases the liquid will start to circulate

Discuss
Answer: (c).as the stirrer speed increases, the liquid will continue to circulate. Eventually a vortex will form.
Q94.
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
Q95.
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
Q96.
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
Q97.
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
Q98.
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)
Q99.
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
Q100.
Which of the following impellers generate a flow parallel to the axis of shaft?

a.

Axial flow

b.

Radial flow

c.

Both (a)and(b)

d.

None of these

Discuss
Answer: (a).Axial flow
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