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- Question
In a glucose-yeast extract medium, Lactococcus lactis has a maximum specific growth rate (um) of 1.23 h-1. What would be the specific growth rate of this organism at steady state in a 4 litre reactor being fed at 2 litres per hour?
Options- A. 0.5 h-1
- B. 1.2 h-1
- C. 2.4 h-1
- D. 4 h-1
- Correct Answer
- 0.5 h-1
- 1. Henry's law relates
Options- A. the partial pressure of oxygen and the saturation concentration of oxygen in the liquid
- B. the oxygen transfer rate and the bubble size
- C. the oxygen transfer rate and the temperature
- D. the oxygen transfer rate to the partial pressure of oxygen in the liquid Discuss
- 2. The methods used for biological treatment are
Options- A. lagoon
- B. activated sludge process
- C. oxidation ditches
- D. all of these Discuss
- 3. BOD stands for
Options- A. biochemical oxygen demand
- B. british oxygen demand
- C. british oxygen depletion
- D. biological oxygen depletion Discuss
- 4. The relationship between the del factor, temperature and time is given as
Options- A. ? = A.t. e-E/RT
- B. ? = 1/(A.t. e-E/RT)
- C. ? = A.t. eE/RT
- D. ? = A.t.T Discuss
- 5. The reduction of number of cells from 1010 to one will result into the del factor (?) of
Options- A. 1
- B. 10
- C. 23
- D. 103 Discuss
- 6. Diauxie is
Options- A. growth factors
- B. microbiological die off
- C. the simultaneous uptake of nutrients
- D. the stagewise uptake of nutrients Discuss
- 7. The K used in the equation for X10=2.303/K depends upon
Options- A. nature of the filter material
- B. linear velocity of the air passing through filter
- C. both (a) and (b)
- D. thickness of the filter Discuss
- 8. For the extractions operation, the selectivity should be
Options- A. > 1
- B. < 1
- C. 1
- D. zero Discuss
- 9. The function of a mechanical seal is to
Options- A. prevent contaminants entering the reactor
- B. prevent cells from leaving the reactor
- C. both (a) and (b)
- D. prevent air to enter Discuss
- 10. Which of the following physical method is used as germicidal in modern time for the treatment of drinking water?
Options- A. Chlorination
- B. Treating with potassium permagnate
- C. UV radiation
- D. Treating with bleaching powder Discuss
More questions
Correct Answer: the partial pressure of oxygen and the saturation concentration of oxygen in the liquid
Correct Answer: all of these
Correct Answer: biochemical oxygen demand
Correct Answer: ? = A.t. e-E/RT
Correct Answer: 23
Correct Answer: the stagewise uptake of nutrients
Correct Answer: both (a) and (b)
Correct Answer: > 1
Correct Answer: both (a) and (b)
Correct Answer: UV radiation
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