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- Question
During aeration, a cylindrical reactor had a height of 10 m. Without aeration, the height was 7.5 m. Under these aeration and mixing conditions, the gas hold up in the reactor is
Options- A. 100%
- B. 75%
- C. 50%
- D. 25%
- Correct Answer
- 25%
- 1. For glucose isomerization by immobilized enzyme, the reactor generally used is
Options- A. CSTR
- B. plug flow
- C. packed bed
- D. fluidized bed Discuss
- 2. If the viscosity of a fluid decreases with the length of time that it is being mixed, then this fluid is
Options- A. newtonian
- B. rheopectic
- C. viscoelastic
- D. thixotropic Discuss
- 3. The SI unit for viscosity is
Options- A. kg.m-1.s-1
- B. kg.m-2.s-2
- C. kg.m-3.s-1
- D. kg.m-1.s-2 Discuss
- 4. The support material for immobilization of cells of Bacillus subtilis is
Options- A. ion exchange resins
- B. gelatin
- C. Anthracite
- D. agarose and carbodiimide Discuss
- 5. If biomass yields are constant, then the biomass productivity of a culture grown in continuous reactor will
Options- A. always decrease with dilution rate
- B. increase with dilution rate until washout
- C. remain constant irrespective of the dilution rate
- D. decrease with dilution rate until washout Discuss
- 6. Pluronic F68 is added to cell culture media as
Options- A. a nutrient
- B. a shear protectorant
- C. to increase oxygen transfer rates
- D. all of these Discuss
- 7. The increased air flow rate in bubble column fermenter can cause excessive foaming and high retention of air bubbles in the column which
Options- A. decreases the productivity of the fermenter
- B. increases the productivity of the fermenter
- C. modestly increases the productivity of the fermenter
- D. does not affect on the productivity Discuss
- 8. The cellular productivity in a continuous stirred tank fermenter (CSTF) increases with an increase in the dilution rate and reaches a maximum value. If the dilution rate is increased beyond the maximum point, the productivity will
Options- A. decrease abruptly
- B. increase
- C. increase drastically
- D. be zero Discuss
- 9. Sanitizers used for rubber made equipments are
Options- A. strong acids
- B. strong alkalis
- C. combination of both
- D. none of these Discuss
- 10. The viscosity of water at STP is approximately
Options- A. 0.005 kg.m-1.s-1
- B. 0.001 kg.m-1.s-1
- C. 0.003 kg.m-2.s-1
- D. 0.1 g.cm-1.s-1 Discuss
More questions
Correct Answer: packed bed
Correct Answer: thixotropic
Correct Answer: kg.m-1.s-1
Correct Answer: agarose and carbodiimide
Correct Answer: increase with dilution rate until washout
Correct Answer: a shear protectorant
Correct Answer: decreases the productivity of the fermenter
Correct Answer: decrease abruptly
Correct Answer: strong alkalis
Correct Answer: 0.001 kg.m-1.s-1
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