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- Question
In batch culture, protogon is produced from peptone during the stationary phase with a yield of 0.4 protogon mg per g of peptone. If it is to be produced in a chemostat at a dilution rate of 0.5 h-1 from a medium containing 10 g.l-1 of peptone, then the rate of protogon synthesis would be
Options- A. 0 g.l-1h-1
- B. 0.5 g.l-1h-1
- C. 1 g.l-1h-1
- D. 2 g.l-1h-1
- Correct Answer
- 0 g.l-1h-1
- 1. 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
- 2. 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
- 3. The lowest yield of ATP /is in
Options- A. fermentation
- B. aerobic respiration
- C. anaerobic respiration
- D. same in (a), (b) and (c) Discuss
- 4. 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
- 5. 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
- 6. A thixotropic 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 mixing time
- D. decreases with mixing time Discuss
- 7. The effect of increasing the stirrer speed in an unbaffled stirred tank reactor is that
Options- A. a small increase in stirrer speed will cause the liquid to enter the turbulent flow regime
- B. as the stirrer speed increases, the liquid will continue to circulate and then become turbulent
- C. as the stirrer speed increases, the liquid will continue to circulate. Eventually a vortex will form.
- D. A vortex will form at low stirrer speeds. As the stirrer speed increases the liquid will start to circulate Discuss
- 8. In wastewater treatment, which bioreactor is generally used?
Options- A. Plug flow reactor
- B. Trickle bed reactor
- C. Tower fermentor
- D. CSTR Discuss
- 9. Which of the following would be best described as an axial flow impeller?
Options- A. An impeller with blades pitched at 45° to the vertical
- B. An impeller which directs liquid flow towards the base of the reactor
- C. Both (a) and (b)
- D. An impeller with blades pitched at 75° to the vertical Discuss
- 10. Turbine impeller consists of flat impeller blades with
Options- A. a vertical pitch welded directly to the shaft
- B. a angled pitch welded directly to the shaft
- C. a vertical pitch welded to a horizontal disk
- D. a angled pitch welded to a horizontal disk Discuss
More questions
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
Correct Answer: decreases with mixing time
Correct Answer: as the stirrer speed increases, the liquid will continue to circulate. Eventually a vortex will form.
Correct Answer: Trickle bed reactor
Correct Answer: Both (a) and (b)
Correct Answer: a vertical pitch welded to a horizontal disk
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