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- Question
The oxygen uptake requirements of a microbial population is characterized by the following parameters: ?m = 0.2 h-1, K0 = 0.2 mg O2.l-1, Y0 = 0.5 mg dry weight/mg O2 and C0,crit=0.8 mg.l-1 The required concentration of cells is 1000 mg.l-1 and the saturation oxygen concentration of the medium is 5.8 mg.l-1. The required KLa must be greater than
Options- A. 64 h-1
- B. 32 h-1
- C. 16 h-1
- D. 8h-1
- Correct Answer
- 64 h-1
- 1. Filamentous fungal cells are more shear sensitive than bacterial cells because of
Options- A. the presence of citin in cell walls of filamentous fungi
- B. larger in size than bacterial cells and therefore are more susceptible to shear forces
- C. fungal cells are much larger than bacterial cells
- D. all of the above Discuss
- 2. Reynolds number for turbulent flow over a plate should be more than
Options- A. 5 x 10-5
- B. 106
- C. 5 x 105
- D. 500 Discuss
- 3. Which of the following impellers generate a flow parallel to the axis of shaft?
Options- A. Axial flow
- B. Radial flow
- C. Both (a)and(b)
- D. None of these Discuss
- 4. Pure oxygen, if used instead of air will increase oxygen transfer rates because
Options- A. the saturation concentration of oxygen is higher
- B. the bubble size is smaller
- C. the oxygen transfer coefficient is larger
- D. the partial pressure of oxygen in the gas phase is lower Discuss
- 5. Water is a
Options- A. newtonian fluid
- B. pseudoplastic
- C. dilatant
- D. rheopectic Discuss
- 6. The function(s) of the draft tube in an airlift bioreactor is
Options- A. to reduce bubble coalescence
- B. to improve circulation
- C. to even out shear conditions throughout the reactor
- D. all of the above Discuss
- 7. The viscous nature of a non-Newtonian fluid
Options- A. remains constant with time and power input
- B. changes with the level of power input and/or the length of time during which the fluid is mixed
- C. is similar to that of a perfect gas
- D. is similar to that of water Discuss
- 8. Which of the following common drugs is not a specific enzyme inhibitor?
Options- A. Iodine
- B. Methotrexate
- C. Sulfbnilamide
- D. Penicillin Discuss
- 9. The purity of a solute collected between two times t1 and t2 during chromatographic separation can be calculated as
Options- A. amount of solute eluted - amount of impurity eluted
- B. amount of solute eluted / amount of impurity eluted
- C. amount of solvent eluted + amount of impurity eluted
- D. amount of solvent eluted / amount of impurity eluted Discuss
- 10. Which of the following factors will affect the sensitivity of animal cells to shear conditions?
Options- A. Cell size
- B. Availability of nutrients in the medium
- C. The presence of shear protectorants in the medium
- D. All of the above Discuss
More questions
Correct Answer: all of the above
Correct Answer: 106
Correct Answer: Axial flow
Correct Answer: the saturation concentration of oxygen is higher
Correct Answer: newtonian fluid
Correct Answer: all of the above
Correct Answer: changes with the level of power input and/or the length of time during which the fluid is mixed
Correct Answer: Iodine
Correct Answer: amount of solute eluted / amount of impurity eluted
Correct Answer: All of the above
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