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 1 of 11

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Q1.
The main function of the dimples provided in the cooling jacket is to

a.

increase the level of turbulence of the cooling water in the jacket

b.

increase the residence time of the cooling water in the jacket

c.

increase the cooling water-jacket wall boundary layer size

d.

all of the above

Discuss
Answer: (a).increase the level of turbulence of the cooling water in the jacket
Q2.
The power required by an agitator operating in a gas-sparged system is

a.

lesser than the power required by an impeller in operating at same speed in a gas free system

b.

more than the power required by an impeller in operating at same speed in a gas free system

c.

same as the power required by an impeller in operating at same speed in a gas free system

d.

none of the above

Discuss
Answer: (a).lesser than the power required by an impeller in operating at same speed in a gas free system
Q3.
Axial flow impellers

a.

provide high shear conditions for breaking up bubbles

b.

provide low shear conditions and are suited for use in shear sensitive procesess

c.

provide direct flow towards the walls of the reactor

d.

none of the above

Discuss
Answer: (b).provide low shear conditions and are suited for use in shear sensitive procesess
Q4.
Bioreactors, where vortex is formed, another dimensionless number, __________ is useful.

a.

Stanton

b.

Rayleigh

c.

Bond

d.

Froude

Discuss
Answer: (d).Froude
Q5.
Oxygen transfer rate is increased with an increase in the stirrer speed in aerated bioreactor because

a.

it decrease the bubble size

b.

it decreases the size of the boundary layer surrounding a bubble

c.

it increases the rate of movement of oxygen molecules through the bulk liquid

d.

all of the above

Discuss
Answer: (d).all of the above
Q6.
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
Q7.
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
Q8.
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.
Q9.
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
Q10.
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
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