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- Question
Analogus to the molecular diffusion, the x-directional flux of microorganisms suspended in a medium due to the axial mixing can be represented as (where Jn is flux component 'n', cn is concentration of'n')
Options- A. Jn = -dcn/dx
- B. Jn = dcn/dx
- C. Jn = -D dcn/dx
- D. Jn = D dcn/dx
- Correct Answer
- Jn = -D dcn/dx
- 1. Radial flow impellers
Options- A. provide high shear conditions for breaking up bubbles
- B. direct flow towards the walls of the reactor
- C. Both (a) and (b)
- D. provide low shear conditions and are suited for use in shear sensitive procesess Discuss
- 2. The Woolf-Augusteinsson-Hofstee plot of ν versus ν/[S] and the Eadie-Scatchard plot of ν/[S] versus ν do not involve reciprocals of ν therefore are considered to be more reliable when the error in v is
Options- A. non-significant
- B. significant
- C. nothing to do with the reliability
- D. non significant in selected cases Discuss
- 3. Wash out in steady state fermentation occurs when
Options- A. dilution rate is less than maximum specific growth rate
- B. dilution rate is higher than the maximum specific growth rate
- C. cell concentration reaches the maximum
- D. specific growth rate is maximum Discuss
- 4. The concentration of biomass in a continuous stirred tank reactor is 20 g dry weight per litre. What would be the concentration of biomass in the effluent?
Options- A. Greater than 20 g dry weight per litre
- B. Approximately 20 g dry weight per litre
- C. Lesser than 20 g dry weight per litre
- D. More than 30 g dry weight per litre Discuss
- 5. Immobilized cell reactors for wastewater treatment have the advantage of having/being
Options- A. higher cell concentration
- B. more stable and prevent washout
- C. higher dilution rate before the cells washout
- D. all of the above Discuss
- 6. The viscosity of a fluid increases with the length of time that it is being mixed. This fluid would be best described as being
Options- A. newtonian
- B. rheopectic
- C. viscoelastic
- D. thixotropic Discuss
- 7. Which of the following metallic ion is there in ascorbic acid oxidase?
Options- A. Mg
- B. Fe
- C. Cu
- D. Mn Discuss
- 8. The collection efficiency by impaction increases with
Options- A. increasing particle diameter
- B. increasing air flow velocity
- C. both (a) and (b)
- D. increasing particle size Discuss
- 9. The specific death rate of an organism can be expressed as
Options- A. ln 2/D
- B. D/ln2
- C. D.ln2
- D. 2.0.3/ln2 Discuss
- 10. Bioreactors, where vortex is formed, another dimensionless number, __________ is useful.
Options- A. Stanton
- B. Rayleigh
- C. Bond
- D. Froude Discuss
More questions
Correct Answer: Both (a) and (b)
Correct Answer: significant
Correct Answer: dilution rate is higher than the maximum specific growth rate
Correct Answer: Approximately 20 g dry weight per litre
Correct Answer: all of the above
Correct Answer: rheopectic
Correct Answer: Cu
Correct Answer: both (a) and (b)
Correct Answer: ln 2/D
Correct Answer: Froude
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