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 2 of 11

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Q11.
Which of the following is most likely to cause an increase in the rate of oxygen transfer into a particular aerated fermentation system?

a.

Addition of antifoams

b.

Increase in temperature

c.

Increase in stirrer speed

d.

Both (a) and (b)

Discuss
Answer: (c).Increase in stirrer speed
Q12.
Bioreactors, where vortex is formed, another dimensionless number, __________ is useful.

a.

Stanton

b.

Rayleigh

c.

Bond

d.

Froude

Discuss
Answer: (d).Froude
Q13.
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
Q14.
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
Q15.
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
Q16.
At 25°C, the saturation concentration of oxygen in water is 1.26 mmol/l and the partial pressure of oxygen is 1 atm. The Henry's law constant will be

a.

0.793atml/mmol

b.

0.207atml/mmol

c.

1.26 atml/mmol

d.

8.74 atml/mmol

Discuss
Answer: (a).0.793atml/mmol
Q17.
Gas hold up, characterizing the hydrodynamics in a fermenter, mainly depends on the

a.

superficial gas velocity

b.

power consumption

c.

Both (a) and (b)

d.

gas concentration

Discuss
Answer: (c).Both (a) and (b)
Q18.
Which of the following will have the highest surface area available for oxygen transfer?

a.

A shake flask

b.

A standing test tube

c.

A non-sparged stirred tank reactor agitated at 400 rpm

d.

A sparged stirred tank reactor agitated at 400 rpm

Discuss
Answer: (d).A sparged stirred tank reactor agitated at 400 rpm
Q19.
A flooded impeller will lead to poor oxygen transfer rates because

a.

bubbles tend to coalesce under the impeller

b.

bubbles tend to break down too rapidly under high shear conditions

c.

bubbles tend to move too quickly through the bulk liquid

d.

the cells clog up the surface of the bubble

Discuss
Answer: (a).bubbles tend to coalesce under the impeller
Q20.
Power consumption by agitation is

a.

a function of physical properties

b.

a function of operating conditions

c.

a function of vessel and impeller geometry

d.

all of the above

Discuss
Answer: (d).all of the above
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