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- Question
In aerobic microorganisms cultures radial flow impellers are used because
Options- A. they provide energy efficient high turbulent mixing conditions
- B. they provide low shear mixing conditions
- C. they provide high shear mixing conditions
- D. they ensure that bubble size is maximized leading to high oxygen transfer rates
- Correct Answer
- they provide high shear mixing conditions
- 1. 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
- 2. 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
- 3. 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
- 4. Population doubling time, td can be expressed as (where ? is the specific growth rate.)
Options- A. log2/?
- B. ln2/?
- C. ?/ln2
- D. ?/log2 Discuss
- 5. 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 Discuss
- 6. In a bioreactor, if at a particular time the oxygen transfer rate is 23 kg.h-1, then the oxygen uptake will be
Options- A. 23 kg.h-1
- B. less than 23 kg.h-1
- C. greater than 23 kg.h-1
- D. 2.3 kg.h-1 Discuss
- 7. Temporary hardness of water is caused by the presence of
Options- A. chlorides of calcium and magnesium
- B. sulfates of calcium and magnesium
- C. bicarbonates of calcium and magnesium
- D. carbonates of sodium and potassium Discuss
- 8. The lowest yield of ATP /is in
Options- A. fermentation
- B. aerobic respiration
- C. anaerobic respiration
- D. same in (a), (b) and (c) Discuss
- 9. Micro filtration refers to the separation of suspended material such as bacteria by using a membrane with spore sizes of
Options- A. 0.02 to 10?m
- B. 1-10A°
- C. 20-30?m
- D. 10-200A° Discuss
- 10. The disk centrifuge is the type of centrifuge used most often for bio separations due to its
Options- A. continuous operation
- B. lesser cost
- C. higher speed
- D. ease in operation Discuss
More questions
Correct Answer: KL = DAB/Zf
Correct Answer: continuous
Correct Answer: higher stirrer speed
Correct Answer: ln2/?
Correct Answer: increases with increasing stirrer speed
Correct Answer: 23 kg.h-1
Correct Answer: bicarbonates of calcium and magnesium
Correct Answer: fermentation
Correct Answer: 0.02 to 10?m
Correct Answer: lesser cost
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