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- Question
Which of the following substances are commonly used in a filter?
Options- A. Charcoal
- B. Sand
- C. Both (a) and (b)
- D. Aluminum chloride
- Correct Answer
- Both (a) and (b)
- 1. The stage wise operation of adsorption is called
Options- A. contact filtration
- B. conventional adsorption
- C. affinity adsorption
- D. ion exchange Discuss
- 2. A continuous bioreactor in which only the flow rate is used to control the rate of cell or product productivity is called
Options- A. turbidostat
- B. chemostat
- C. level stat
- D. pH Discuss
- 3. A competitive inhibitor of an enzyme is usually
Options- A. a highly reactive compound
- B. a metal ion such as Hg2+ or Pb2+
- C. structurally similar to the substrate.
- D. water insoluble Discuss
- 4. Which of the following is most likely to cause an increase in the rate of oxygen transfer into a particular aerated fermentation system?
Options- A. Addition of antifoams
- B. Increase in temperature
- C. Increase in stirrer speed
- D. Both (a) and (b) Discuss
- 5. Which of the following describes the detrimental effect of bubbles on animal cells?
Options- A. Cells trapped on the surface of bubbles can be damaged when the bubbles explode, releasing their pressure and surface energies
- B. Cells trapped in the moving foam can be dragged apart by the bubbles
- C. Both (a) and (b)
- D. Bubbles can explode in the liquid medium causing the release of ultraviolet radiation Discuss
- 6. Power number is expressed as
Options- A. P0 / N2Di3?
- B. P0 / N3Di5?
- C. P0 / N3Di3?
- D. P0 / N2Di2? Discuss
- 7. The enzyme used to reduce bitterness of grapes commonly contains
Options- A. ?-L-rhamonosidase
- B. ?-d-glucosidase
- C. ?- galactosidase
- D. both (a) and (b) Discuss
- 8. A Newtonian 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 Discuss
- 9. The function of the disengagement zone in an airlift fermenter is to
Options- A. prevent CO2 rich bubbles from entering the downcomer
- B. reduce the velocity of the bubbles
- C. reduce liquid loss as aerosols
- D. all of the above Discuss
- 10. An open system in which the growth rate is maintained by adding a nutrient (present in limiting quantities) at the same rate as that medium containing micro-organisms is removed is called
Options- A. manostat
- B. chemostat
- C. turbidostat
- D. culturostat Discuss
More questions
Correct Answer: contact filtration
Correct Answer: chemostat
Correct Answer: structurally similar to the substrate.
Correct Answer: Increase in stirrer speed
Correct Answer: Both (a) and (b)
Correct Answer: P0 / N3Di5?
Correct Answer: both (a) and (b)
Correct Answer: is constant regardless of the stirrer speed or mixing time
Correct Answer: all of the above
Correct Answer: chemostat
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