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- Question
The advantage of axial flow impellers over radial flow impellers is that axial flow impellers
Options- A. provide better lift of solids
- B. provide high shear conditions
- C. provide low shear conditions
- D. are cheaper to build
- Correct Answer
- provide better lift of solids
- 1. 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
- 2. 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
- 3. 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
- 4. Which of the following metallic ion is there in ascorbic acid oxidase?
Options- A. Mg
- B. Fe
- C. Cu
- D. Mn Discuss
- 5. 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
- 6. 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
- 7. Bioreactors, where vortex is formed, another dimensionless number, __________ is useful.
Options- A. Stanton
- B. Rayleigh
- C. Bond
- D. Froude Discuss
- 8. Which of the following is considered as a disadvantage to the adsorption method of immobilization?
Options- A. It is possible to separate and purify the enzymes while being immobilized
- B. The enzymes are not usually deactivated by adsorption
- C. The adsorption is a reversible process
- D. State of immobilization is very sensitive to solution pH, ionic strength and temperature Discuss
- 9. Which of the following statements is not true?
Options- A. Enzymes are proteins that bind to specific substrates and increase the velocity of reactions involving those substrates
- B. Enzymes function by overcoming the activation energy barrier of a reaction
- C. Enzymes make thermodynamically favorable reactions to proceed; they cannot make unfavorable reactions to occur
- D. Enzymes only function when they are in intact cells Discuss
- 10. A viscoelastic fluid is one in which the viscosity
Options- A. is constant regardless of the stirrer speed or mixing time
- B. changes during mixing but returns to its original state after mixing
- C. increases with increasing stirrer speed
- D. decreases with increasing stirrer speed Discuss
More questions
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
Correct Answer: State of immobilization is very sensitive to solution pH, ionic strength and temperature
Correct Answer: Enzymes only function when they are in intact cells
Correct Answer: changes during mixing but returns to its original state after mixing
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