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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. Unsteady state mass balance for dynamic model of continuous stirred tank reactor (CSTR) is
Options- A. time rate of total amount in rector = rate of addition to reactor -rate of removal + rate of formation
- B. total amount in rector = rate of addition to reactor - rate of removal + rate of formation
- C. rate of total amount in rector = rate of addition to reactor - rate of removal + rate of formation
- D. none of the above Discuss
- 2. A continuous reactor has a dilution rate of 0.5 h-1. Its residence time would be
Options- A. ln(2)/0.5
- B. ln(2) x 0.5
- C. 0.5 h
- D. 2 h Discuss
- 3. 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
- 4. 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
- 5. 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
- 6. Population doubling time, td can be expressed as (where ? is the specific growth rate.)
Options- A. log2/?
- B. ln2/?
- C. ?/ln2
- D. ?/log2 Discuss
- 7. 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
- 8. 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
- 9. 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
- 10. The lowest yield of ATP /is in
Options- A. fermentation
- B. aerobic respiration
- C. anaerobic respiration
- D. same in (a), (b) and (c) Discuss
More questions
Correct Answer: time rate of total amount in rector = rate of addition to reactor -rate of removal + rate of formation
Correct Answer: 2 h
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
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