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- Question
A fermentation system has a KLa of 3 s-1 and a C0* of 5 ppm of O2. If the bulk liquid is saturated with oxygen then the oxygen transfer rate will be equal to
Options- A. zero
- B. 3 mg.l-1.s-1
- C. 5 mg.l-1.s-1
- D. 15 mg.l-1.s-1
- Correct Answer
- zero
- 1. 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
- 2. 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
- 3. Soya off flavour removal may be achieved using
Options- A. di acetyl reductase
- B. ?- amylase
- C. aldehyde oxidase
- D. protease Discuss
- 4. Temporary hardness of water may be removed by adding
Options- A. calcium hydroxide
- B. calcium carbonate
- C. calcium chloride
- D. sodium bicarbonate Discuss
- 5. Liquefaction of starch to dextrin is carried out by
Options- A. ?-amylase
- B. cellulase
- C. pectinase
- D. all of these Discuss
- 6. 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
- 7. 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
- 8. 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
- 9. 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
- 10. The mechanism of air filtration in fibrous filter is
Options- A. electrostatic attraction
- B. impaction
- C. interception
- D. all of these Discuss
More questions
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
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
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