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- Question
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
- Correct Answer
- All of these
- 1. Which of the following would not be subjected to the "glucose effect"?
Options- A. Aspergillus fumigatus
- B. Saccharomyces cerevisiae
- C. Escherichia coli
- D. Aspergillus niger Discuss
- 2. A typical tubular centrifuge has a bowl of 2 to 5 inch in diameter and 9 to 30 inch in height with a maximum rotating speed of
Options- A. 15,000 to 50,000 rpm
- B. 50,000 to 100,000 rpm
- C. 100,000 to 150,000 rpm
- D. 150,000 to 200,000 rpm Discuss
- 3. Which device is commonly used for measuring the rate of rotation (rpm) of the stirrer shaft?
Options- A. Anemometer
- B. Manometer
- C. Tachometer
- D. Barometer Discuss
- 4. The highest temperature which appears to be feasible for batch sterilization is
Options- A. 121°C
- B. 100°C
- C. 105°C
- D. 130°C Discuss
- 5. The main function(s) of a draft tube in an air lift fermenter is/are to
Options- A. increase the solubility of oxygen
- B. distribute shear forces throughout the reactor and minimise bubble coalescence
- C. concentrate shear forces around the sparger
- D. concentrate shear forces near the disengagement zone Discuss
- 6. The bubble column fermenter is usually limited to
Options- A. aerobic fermentations
- B. anaerobic fermentations
- C. Both (a) and (b)
- D. facultative fermentation Discuss
- 7. The specific growth rate is affected by
Options- A. sabstrate concentration
- B. product concentration
- C. oxygen supply
- D. all of these Discuss
- 8. Saccharomyces cerevisiae when grown in high glucose concentration medium, the cells activity depends on which of the following?
Options- A. High concentration of dissolved oxygen
- B. Low concentration of dissolved oxygen
- C. No effect of dissolved oxygen
- D. High concentration of dissolved oxygen and sodium salts Discuss
- 9. The application of just in time (JIT) manufacturing techniques in biotechnology is important because
Options- A. raw materials used in biotechnology are biodegradable
- B. the products of biotechnology are biodegradable
- C. it is a very competitive business (d) all of the above
- D. all of the above Discuss
- 10. The viscosity of the culture fluid is classified as both pseudoplastic and thixotropic which indicates that the viscosity
Options- A. increases with stirring speed but decreases with mixing time
- B. increases with stirring speed and increases with mixing time
- C. decreases with stirring speed but increases with mixing time
- D. decreases with stirring speed and decreases with mixing time Discuss
More questions
Correct Answer: Escherichia coli
Correct Answer: 15,000 to 50,000 rpm
Correct Answer: Tachometer
Correct Answer: 121°C
Correct Answer: distribute shear forces throughout the reactor and minimise bubble coalescence
Correct Answer: aerobic fermentations
Correct Answer: all of these
Correct Answer: No effect of dissolved oxygen
Correct Answer: all of the above
Correct Answer: decreases with stirring speed and decreases with mixing time
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