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MCQs

Total Questions : 234 | Page 5 of 24 pages
Question 41. Froude number is avoided in calculation of power requirements for low viscosity liquid mixing systems when
  1.    baffled systems are used
  2.    Reynolds number is less than 300
  3.    both (a)and(b)
  4.    none of these
 Discuss Question
Answer: Option C. -> both (a)and(b)
Answer: (c).both (a)and(b)
Question 42. 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
  1.    100%
  2.    75%
  3.    50%
  4.    25%
 Discuss Question
Answer: Option D. -> 25%
Answer: (d).25%
Question 43. A fermentation system has a KLa of 3 s­¹ and a C0* of 5 ppm of O₂. If the bulk liquid is saturated with oxygen then the oxygen transfer rate will be equal to
  1.    zero
  2.    3 mg.l­¹.s­¹
  3.    5 mg.l­¹.s­¹
  4.    15 mg.l­¹.s­¹
 Discuss Question
Answer: Option A. -> zero
Answer: (a).zero
Question 44. In aerobic microorganisms cultures radial flow impellers are used because
  1.    they provide energy efficient high turbulent mixing conditions
  2.    they provide low shear mixing conditions
  3.    they provide high shear mixing conditions
  4.    they ensure that bubble size is maximized leading to high oxygen transfer rates
 Discuss Question
Answer: Option C. -> they provide high shear mixing conditions
Answer: (c).they provide high shear mixing conditions
Question 45. Which of the following would be best described as a radial flow impeller?
  1.    An impeller with blades pitched at 45° to the vertical
  2.    A Rushton turbine
  3.    Both (a) and (b)
  4.    An impeller which directs liquid flow towards the base of the reactor
 Discuss Question
Answer: Option B. -> A Rushton turbine
Answer: (b).A Rushton turbine
Question 46. Small propellers turn at the speed of either
  1.    20 or 150 rpm
  2.    150 or 300 rpm
  3.    400 or 800 rpm
  4.    1150 rpm or 1750 rpm
 Discuss Question
Answer: Option D. -> 1150 rpm or 1750 rpm
Answer: (d).1150 rpm or 1750 rpm
Question 47. Which of the following is not classified as an axial flow impeller?
  1.    A propeller
  2.    A marine impeller
  3.    A Rushton turbine
  4.    A hydrofoil impeller
 Discuss Question
Answer: Option C. -> A Rushton turbine
Answer: (c).A Rushton turbine
Question 48. Detergent like substances produced by microorganisms during a fermentation will lead to
  1.    decrease the surface tension of the liquid
  2.    accumulate at the gas liquid interface
  3.    decrease the rate of bubble coalescence
  4.    all of the above
 Discuss Question
Answer: Option D. -> all of the above
Answer: (d).all of the above
Question 49. Power number (Np) is also known as
  1.    Froude's number
  2.    Bond's number
  3.    Newton's number
  4.    Rayleigh's number
 Discuss Question
Answer: Option C. -> Newton's number
Answer: (c).Newton's number
Question 50. Flooding is a condition/phenomenon which occur in a bioreactor when
  1.    The air escapes without being distributed by the agitator
  2.    The fermenter medium spills out the reactor due to foaming
  3.    The volume of foam is more than the volume of broth
  4.    None of the above
 Discuss Question
Answer: Option A. -> The air escapes without being distributed by the agitator
Answer: (a).The air escapes without being distributed by the agitator

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