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- Question
Trichoderma ?-glucanase is reported
Options- A. to stabilize mashing
- B. to convert taste fractions of dextrins to fermentable sugars in beer
- C. to convert starch to dextrin
- D. all of the above
- Correct Answer
- to stabilize mashing
- 1. Which of the following would be best described as an axial flow impeller?
Options- A. An impeller with blades pitched at 45° to the vertical
- B. An impeller which directs liquid flow towards the base of the reactor
- C. Both (a) and (b)
- D. An impeller with blades pitched at 75° to the vertical Discuss
- 2. Turbine impeller consists of flat impeller blades with
Options- A. a vertical pitch welded directly to the shaft
- B. a angled pitch welded directly to the shaft
- C. a vertical pitch welded to a horizontal disk
- D. a angled pitch welded to a horizontal disk Discuss
- 3. The del factor (?) increases as the final number of cells
Options- A. decreases
- B. increases
- C. zero
- D. constant Discuss
- 4. The dilution rate, D is defined as(where F = volumetric flow rate, VR = total volume of culture in the reactor and ? specific growth rate)
Options- A. F/VR
- B. VR/F
- C. ?/F
- D. F/? Discuss
- 5. The reason of using a flat disk in a Turbine is
Options- A. to create high shear conditions
- B. to break up bubbles more efficiently than the impeller blades
- C. to ensure that the bulk of the energy consumption occurs at the blades
- D. all of the above Discuss
- 6. The oxygen uptake requirements of a microbial population is characterized by the following parameters: ?m = 0.2 h-1, K0 = 0.2 mg O2.l-1, Y0 = 0.5 mg dry weight/mg O2 and C0,crit=0.8 mg.l-1 The required concentration of cells is 1000 mg.l-1 and the saturation oxygen concentration of the medium is 5.8 mg.l-1. The required KLa must be greater than
Options- A. 64 h-1
- B. 32 h-1
- C. 16 h-1
- D. 8h-1 Discuss
- 7. The reduction in off flavour of beer is practiced through
Options- A. hersperidinase
- B. rnase
- C. invertase
- D. diacetyl reductase Discuss
- 8. Calgon is used for removal of
Options- A. sodium carbonate
- B. permanent hardness of water
- C. potassium carbonate
- D. none of these Discuss
- 9. 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
- 10. 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
More questions
Correct Answer: Both (a) and (b)
Correct Answer: a vertical pitch welded to a horizontal disk
Correct Answer: decreases
Correct Answer: F/VR
Correct Answer: to ensure that the bulk of the energy consumption occurs at the blades
Correct Answer: 64 h-1
Correct Answer: diacetyl reductase
Correct Answer: permanent hardness of water
Correct Answer: Both (a) and (b)
Correct Answer: significant
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