Discussion
Home ‣ Biochemical Engineering ‣ Fermentation Reactors See What Others Are Saying!
- Question
The cellular productivity in a continuous stirred tank fermenter (CSTF) increases with an increase in the dilution rate and reaches a maximum value. If the dilution rate is increased beyond the maximum point, the productivity will
Options- A. decrease abruptly
- B. increase
- C. increase drastically
- D. be zero
- Correct Answer
- decrease abruptly
- 1. A typical ceiling fan would be best described as a(n)
Options- A. radial flow impeller
- B. axial flow impeller
- C. intermig impeller
- D. Rushton turbine Discuss
- 2. The maximum permissible limit (BIS) of turbidity in drinking water is
Options- A. 5 NTU
- B. 10 NTU
- C. 15 NTU
- D. 20 NTU Discuss
- 3. In an airlift bioreactor, the spent gases released from the liquid are called
Options- A. downcomer
- B. disengagement zone
- C. air riser
- D. flotsam Discuss
- 4. Axial flow impellers
Options- 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
- 5. The production of an amylase from starch by Aspergillus niger is often performed in a fed batch fermenter. This is due to the reason that
Options- A. fed-batch reactor can be used to minimize starch concentrations and prevent a. niger from fermenting
- B. fed-batch reactor can be used to minimize starch concentrations and thus reduce the viscosity of the medium
- C. continuous reactor can be used to minimize starch concentrations and their inhibitory effects
- D. all of the above Discuss
- 6. Unsteady state mass balance for dynamic model of continuous stirred tank reactor (CSTR) is
Options- A. time rate of total amount in rector = rate of addition to reactor -rate of removal + rate of formation
- B. total amount in rector = rate of addition to reactor - rate of removal + rate of formation
- C. rate of total amount in rector = rate of addition to reactor - rate of removal + rate of formation
- D. none of the above Discuss
- 7. A continuous reactor has a dilution rate of 0.5 h-1. Its residence time would be
Options- A. ln(2)/0.5
- B. ln(2) x 0.5
- C. 0.5 h
- D. 2 h Discuss
- 8. Which of the following model holds correct for the two-film theory? (where KL is the mass transfer coefficient, DAB diffusivity and Zf film thickness)
Options- A. KL = DAB/Zf
- B. KL = DAB
- C. KL = Zf/DAB
- D. KL = DAB.Zf Discuss
- 9. A culture system with constant environmental conditions maintained through continual provision of nutrient and removal of wastes is called __________ culture system.
Options- A. continuous
- B. batch
- C. fed-batch
- D. semi continuous Discuss
- 10. An increase in the heat transfer in the stirred tank reactor will be observed at
Options- A. higher cooling water temperature
- B. higher stirrer speed
- C. the removal of baffles from the reactor
- D. slower stirrer speed Discuss
More questions
Correct Answer: axial flow impeller
Correct Answer: 10 NTU
Correct Answer: disengagement zone
Correct Answer: provide low shear conditions and are suited for use in shear sensitive procesess
Correct Answer: fed-batch reactor can be used to minimize starch concentrations and thus reduce the viscosity of the medium
Correct Answer: time rate of total amount in rector = rate of addition to reactor -rate of removal + rate of formation
Correct Answer: 2 h
Correct Answer: KL = DAB/Zf
Correct Answer: continuous
Correct Answer: higher stirrer speed
Comments
There are no comments.Programming
Copyright ©CuriousTab. All rights reserved.