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Home ‣ Biochemical Engineering ‣ Fermentation Reactors See What Others Are Saying!
- Question
In aerobic yeast fermentation for production of citric acid from alkanes using a fed-batch culture, why alkanes are slowly fed to the yeast?
Options- A. Citric acid is toxic to the cells
- B. Alkanes cause foaming
- C. Fast addition of alkanes will inhibit the cells and reduce oxygen transfer rates
- D. Fast addition of alkanes will cause the cells to grow too quickly
- Correct Answer
- Fast addition of alkanes will inhibit the cells and reduce oxygen transfer rates
- 1. Soya off flavour removal may be achieved using
Options- A. di acetyl reductase
- B. ?- amylase
- C. aldehyde oxidase
- D. protease Discuss
- 2. Temporary hardness of water may be removed by adding
Options- A. calcium hydroxide
- B. calcium carbonate
- C. calcium chloride
- D. sodium bicarbonate Discuss
- 3. Liquefaction of starch to dextrin is carried out by
Options- A. ?-amylase
- B. cellulase
- C. pectinase
- D. all of these Discuss
- 4. Which of the following is considered as a pretreatment to the biological feeds?
Options- A. Heating to denature the proteins
- B. Addition of filter aids to increase the porosity
- C. Addition of electrolytes
- D. All of the above Discuss
- 5. Filtration leaf test results indicate that the filtration rate of a protein product is 100 dry lbs/(ft2 hr). What size production filter would be required to obtain 100 dry lbs of filter cake/hr?
Options- A. 1.54 ft2
- B. 3.08 ft2
- C. 65 ft2
- D. 65 lbs/ ft2.hr Discuss
- 6. For the turbulent flow, the dispersion coefficient is correlated as a function of
Options- A. Reynolds number
- B. Sherwood number
- C. Schmidt number
- D. Grashof number Discuss
- 7. The common methods used for disinfection in waste water treatment plants are
Options- A. chlorination
- B. UV light
- C. both (a) and (b)
- D. Phenolic solvent Discuss
- 8. The mechanism of air filtration in fibrous filter is
Options- A. electrostatic attraction
- B. impaction
- C. interception
- D. all of these Discuss
- 9. A Bacillus sp. produces an antibiotic only during the stationary phase when grown in a batch culture. If grown in a 5 litre continuous culture, the steady state productivity of the antibiotic
Options- A. will increase until the culture washes out
- B. will decrease after washout
- C. will be zero
- D. will be infinite Discuss
- 10. A typical ceiling fan would be best described as a(n)
Options- A. radial flow impeller
- B. axial flow impeller
- C. intermig impeller
- D. Rushton turbine Discuss
More questions
Correct Answer: aldehyde oxidase
Correct Answer: calcium hydroxide
Correct Answer: ?-amylase
Correct Answer: All of the above
Correct Answer: 1.54 ft2
Correct Answer: Reynolds number
Correct Answer: both (a) and (b)
Correct Answer: all of these
Correct Answer: will be zero
Correct Answer: axial flow impeller
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