Discussion
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- Question
Higher temperatures affect oxygen transfer rates by
Options- A. increasing KLa but lowering C*o
- B. lowering KLa but increasing C*o
- C. increasing KLa and increasing Co
- D. lowering KLa and lowering Co
- Correct Answer
- increasing KLa but lowering C*o
- 1. The filter material used for air filtration system is/are
Options- A. glass wool
- B. glass fibre
- C. norite
- D. all of the above Discuss
- 2. Glass fibers are favorable as a filter medium because they give a
Options- A. lower pressure drop and are less liable to wetting or combustion
- B. more pressure drop and are less liable to wetting or combustion
- C. lower pressure drop and are more liable to wetting or combustion
- D. more pressure drop and are more liable to wetting or combustion Discuss
- 3. The interception efficiency can be expressed as (where dp is the particle diameter and Dc cylindrical collection diameter)
Options- A. dp/Dc
- B. dp x Dc
- C. dp/Dc x 100
- D. dpDc/100 Discuss
- 4. Which of the following best explains the reasons for using axial flow impellers in crystallization and precipitation reactions?
Options- A. Crystal and precipitates are not too small, so as to ensure easy separation of the solids from the mother liquor
- B. Crystals and precipitates are thoroughly broken down, so as to ensure easy separation of the solids from the mother liquor
- C. Both (a) and (b)
- D. Axial flow impellers provide low shear, energy efficient mixing conditions Discuss
- 5. A Brookfield viscometer cannot determine the shear stress because
Options- A. the shear stress is not defined
- B. a computer is required
- C. the impeller type is given only by numbers
- D. all of the above Discuss
- 6. An enzyme has a Km of 4.7 x 10-5M. If the Vmax of the preparation is 22m moles liter-1 min-1, what velocity would be observed in the presence of 2.0 x 10-4M substrate and 5.0 x 10-5M of a competitive inhibitor?
Options- A. 13.54? moles liter-1min-1
- B. 6.68? moles liter-1min-1
- C. 7.57? moles liter-1min-1
- D. 17.8? moles liter-1min-1 Discuss
- 7. Lock and key theory is based on the compatibility of
Options- A. enzyme and substrate
- B. enzyme and product
- C. enzyme and enzyme substrate complex
- D. enzyme substrate complex and product Discuss
- 8. When the height of an aerated bioreactor is increased, it will increase the oxygen transfer rate by
Options- A. increasing the partial pressure of oxygen at the base of the reactor
- B. decreasing the saturation concentration of oxygen in the reactor
- C. decreasing the gas-holdup
- D. all of the above Discuss
- 9. Which of the following is correct for the off-centre impellers?
Options- A. Off-centre impellers can be used with any size reactor
- B. Off-centre impellers should only be used with reactors with volumes less than 10 m3
- C. The impeller should never be placed in an off-centre position
- D. Off-centre impellers can be used when volume is greater than 10 m3 Discuss
- 10. For turbulent flow, Reynolds number is correlated with power number as (where K, a constant which depends on the container geometry and shape of stirrer; Rei, is Reynolds number for agitator; Di, stirrer diameter and N, stirrer speed)
Options- A. Np = K(Rei)-1
- B. Np = N2Di(Rei)-1
- C. Np = K
- D. Can't be correlated Discuss
More questions
Correct Answer: all of the above
Correct Answer: lower pressure drop and are less liable to wetting or combustion
Correct Answer: dp/Dc
Correct Answer: Crystal and precipitates are not too small, so as to ensure easy separation of the solids from the mother liquor
Correct Answer: the shear stress is not defined
Correct Answer: 13.54? moles liter-1min-1
Correct Answer: enzyme and substrate
Correct Answer: increasing the partial pressure of oxygen at the base of the reactor
Correct Answer: Off-centre impellers should only be used with reactors with volumes less than 10 m3
Correct Answer: Np = K
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