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- Question
A dilatant fluid is one in which the viscosity
Options- A. is constant regardless of the stirrer speed or mixing time
- B. changes during mixing but returns to its original state after mixing
- C. increases with increasing stirrer speed
- D. decreases with increasing stirrer speed
- Correct Answer
- increases with increasing stirrer speed
- 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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