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- Question
In a two-phase system where the continuous phase remains in place, the gas hold up can be expressed as (where Vs and Vt are the superficial gas velocity and bubble rise velocity)
Options- A. H = Vs/(Vs-Vt)
- B. H = Vs/(Vs+ Vt)
- C. H = Vs/(Vs.Vt)
- D. H = (Vs+Vt)/Vs
- Correct Answer
- H = Vs/(Vs+ Vt)
- 1. The region of an airlift bioreactor in which the liquid travels in a downward direction is called the
Options- A. downcomer
- B. disengagement zone
- C. air riser
- D. flotsam Discuss
- 2. Laminar flow range of mixing speed is obtained for
Options- A. Rei<10
- B. 10<Rei<104
- C. Rei>104
- D. None of these Discuss
- 3. A liquid is flowing at 11,400 l.h-1 along a pipeline having a diameter of 4 cm. If the liquid has a density of 1 g.ml-1 and viscosity of 0.001kg.m-1.s-1, then the liquid would be in the
Options- A. laminar phase
- B. transient phase
- C. turbulent phase
- D. any of the phase Discuss
- 4. Pluronic F68 protects mammalian cells from damage stems as it is a/an
Options- A. surface active agent which stabilizes foams
- B. surface active agent which destabilizes foams
- C. excellent source of vitamins
- D. coagulant Discuss
- 5. An aerated bioreactor will increase oxygen transfer rates with the addition of detergents because it
Options- A. enhances bubble coalescence
- B. causes bubbles to expand
- C. discourages bubble coalescence
- D. increases the surface tension of the liquid Discuss
- 6. When substrate [S] = KM (Michaelis-Menten constant), the velocity of an enzyme catalyzed reaction is about
Options- A. 0.1 * Vmax
- B. 0.2 * Vmax
- C. 0.5 * Vmax
- D. 0.9 * Vmax Discuss
- 7. Commonly employed water insoluble supports for the covalent attachment of enzyme include
Options- A. acrylamide based polymers
- B. polypeptides
- C. dextran
- D. all of these Discuss
- 8. Which of the following(s) is/are non-mechanically agitated reactors?
Options- A. Stirrer tank reactor
- B. Bubble column
- C. Air lift reactor
- D. Both (b) and (c) Discuss
- 9. Which of the following affect the Kolmogorov eddy size?
Options- A. Stirrer speed
- B. Physical properties of the liquid
- C. Size and type of impeller
- D. All of these Discuss
- 10. The mechanical means of accomplishing sterilization of fermentation media/equipment is
Options- A. ultrasonic
- B. radiation
- C. chemical agents
- D. none of these Discuss
More questions
Correct Answer: downcomer
Correct Answer: Rei<10
Correct Answer: turbulent phase
Correct Answer: surface active agent which stabilizes foams
Correct Answer: discourages bubble coalescence
Correct Answer: 0.5 * Vmax
Correct Answer: all of these
Correct Answer: Both (b) and (c)
Correct Answer: All of these
Correct Answer: ultrasonic
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