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- Question
A cylindrical reactor has a liquid volume of 100,000 litres. It has an aspect ratio the ratio of the channel height to width of 1:1. The height of the liquid in the reactor will be approximately:
Options- A. 1.0 m
- B. 3.0 m
- C. 5.0 m
- D. 7.0 m
- Correct Answer
- 5.0 m
- 1. When a culture of fermenting yeast becomes metabolically uncoupled, ethanol
Options- A. becomes a secondary metabolite
- B. production becomes growth associated
- C. production becomes non-growth associated
- D. becomes a growth nutrient Discuss
- 2. Which of the following would be best described as a radial flow impeller?
Options- A. An impeller with blades pitched at 45° to the vertical
- B. A Rushton turbine
- C. Both (a) and (b)
- D. An impeller which directs liquid flow towards the base of the reactor Discuss
- 3. A higher liquid height will lead to a higher gas hold up by which the oxygen transfer rate will be
Options- A. higher throughout the reactor
- B. lower throughout the reactor
- C. higher at the base of the reactor
- D. lower at the base of the reactor Discuss
- 4. A fed-batch reactor initially contains 2 litre of medium. If it was fed at 1 litre per hour, then after 10 hours, the volume of the reactor will be
Options- A. 1 litre
- B. 2 litre
- C. 3 litre
- D. 13 litre Discuss
- 5. Reynolds number for laminar flow over a plate should be less than
Options- A. 500 mm
- B. 5 x 10-5
- C. 5 x 105
- D. 5 m Discuss
- 6. Acid used mostly for removal of milk stone is
Options- A. phosphoric acid
- B. nitric acid
- C. gluconic acid
- D. tartaric acid Discuss
- 7. Which of the following describes the importance of the Kolmogorov eddy size in the biotechnology?
Options- A. The Kolmogorov eddy size is a measure of the smallest eddy size in a liquid
- B. When the Kolmogorov eddy size become equivalent or smaller than the cell or particle diameter, then the cell or particle will become susceptible to shear damage
- C. At the Kolmogorov eddy size, much of the energy of the originating eddy will be released
- D. All of the above Discuss
- 8. In the death phase
Options- A. nutrients available for the cells are depleted and begin to die
- B. the number of viable cells will increase
- C. nutrients available for cells are replenished and start to multiply
- D. none of the above Discuss
- 9. Which of the following is correct?
Options- A. The viscosity of liquids and gases decrease with increasing temperature
- B. The viscosity of liquids and gases increase with increasing temperature
- C. the viscosity of gases increases with increasing temperature, but decreases in liquids
- D. the viscosity of gases decreases with increasing temperature, but decreases in liquids. Discuss
- 10. Soya off flavour removal may be achieved using
Options- A. di acetyl reductase
- B. ?- amylase
- C. aldehyde oxidase
- D. protease Discuss
More questions
Correct Answer: production becomes non-growth associated
Correct Answer: A Rushton turbine
Correct Answer: higher at the base of the reactor
Correct Answer: 2 litre
Correct Answer: 5 x 105
Correct Answer: nitric acid
Correct Answer: All of the above
Correct Answer: nutrients available for the cells are depleted and begin to die
Correct Answer: the viscosity of gases increases with increasing temperature, but decreases in liquids
Correct Answer: aldehyde oxidase
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