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.
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
Q2.
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
Q3.
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)
Q4.
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)
Q5.
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
Q6.
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
Q7.
Which of the following is not considered among the three best-known theories of interphase mass transfer?

a.

two-film theory

b.

penetration theory

c.

surface renewal theory

d.

Calderbank and Moo-Young theory

Discuss
Answer: (d).Calderbank and Moo-Young theory
Q8.
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
Q9.
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
Q10.
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)
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