quiz

Bioreactor Quiz

1. What is the main function of a stirred tank reactor (STR)?

A) To immobilize cells on particles
B) To increase oxygen transfer without stirring
C) To homogenize and aerate the mixture
D) To reduce turbulence and prevent mixing

2. Which feature differentiates an airlift reactor from a bubble column reactor?

A) The presence of a mechanical stirrer
B) The presence of a draft tube
C) High-pressure operation
D) Use of immobilized particles

3. Why are stirred tank reactors widely used in industry despite certain limitations?

A) They are the most efficient bioreactors for all processes.
B) They allow minimal loss in case of contamination.
C) They produce high oxygen transfer rates without stirring.
D) They can operate without seals.

4. Which type of bioreactor is known for the potential drawback of bed compaction and channeling?

A) Stirred tank reactor
B) Fluidized bed reactor
C) Packed bed reactor
D) Airlift reactor

5. What is one major advantage of fluidized bed bioreactors over packed bed reactors?

A) Lower energy consumption
B) Lower attrition of solid particles
C) Use of mechanical stirrers
D) Simple design

6. Which of the following is a significant limitation when using stirred tank reactors for animal and plant cells?

A) High energy consumption
B) Low oxygen transfer rates
C) Excessive shear forces
D) Poor nutrient mixing

7. What purpose does the draft tube serve in an airlift bioreactor?

A) It decreases oxygen transfer rates.
B) It improves circulation and equalizes shear forces.
C) It prevents the reactor from clogging.
D) It provides an outlet for waste products.

8. What aspect ratio is typically used for stirred tank reactors to maintain high turbulence?

A) 1:1
B) 2:1
C) 3:1 or 4:1
D) 5:1

9. Fluidized bed bioreactors commonly operate with which phases?

A) Solid and liquid only
B) Liquid and gas only
C) Solid, liquid, and gas
D) Solid and gas only

10. In a packed bed bioreactor, the nutrient solution is typically introduced:

A) Only from the top
B) Only from the bottom
C) From either the top or bottom
D) Through a central draft tube