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- Question
The viscosity of liquid was classified as both dilatant and rheopectic, which means that the viscosity
Options- A. increased with stirring speed but decreased with mixing time
- B. increased with stirring speed and increased with mixing time
- C. decreased with stirring speed but increased with mixing time
- D. decreased with stirring speed and decreased with mixing time
- Correct Answer
- increased with stirring speed and increased with mixing time
- 1. Chemostats work on the principle of
Options- A. maintaining constant volume of culture medium
- B. maintaining continuous flow of nutrients
- C. maintaining uniform nutrients concentration
- D. operating at higher pressure Discuss
- 2. In a plug flow reactor, the highest concentration of substrates is exposed to the cells that
Options- A. are near the effluent or exit of the reactor
- B. are in the mid way along the reactor
- C. are located near entrance of feed
- D. are near the wall of the reactor Discuss
- 3. The continuous cultures are not widely used in industry because
Options- A. they are not suited for the production of secondary metabolites
- B. contamination or mutation can have a disastrous effect on the operation
- C. the government will not approve the licensing of pharmaceuticals produced in continuous cultures
- D. all of the above Discuss
- 4. Transient flow range of mixing speed is obtained for
Options- A. Rei<10
- B. 10<Rei<104
- C. Rei>104
- D. None of these Discuss
- 5. 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
- 6. The methods used for biological treatment are
Options- A. lagoon
- B. activated sludge process
- C. oxidation ditches
- D. all of these Discuss
- 7. BOD stands for
Options- A. biochemical oxygen demand
- B. british oxygen demand
- C. british oxygen depletion
- D. biological oxygen depletion Discuss
- 8. 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
- 9. 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
- 10. Diauxie is
Options- A. growth factors
- B. microbiological die off
- C. the simultaneous uptake of nutrients
- D. the stagewise uptake of nutrients Discuss
More questions
Correct Answer: maintaining uniform nutrients concentration
Correct Answer: are located near entrance of feed
Correct Answer: all of the above
Correct Answer: 10<Rei<104
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
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