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MCQs

Total Questions : 234 | Page 6 of 24 pages
Question 51. A cylindrical reactor has a liquid volume of 100,000 litres. It has an aspect ratio the ratio of the channel height to width of 1:1. The height of the liquid in the reactor will be approximately:
  1.    1.0 m
  2.    3.0 m
  3.    5.0 m
  4.    7.0 m
 Discuss Question
Answer: Option C. -> 5.0 m
Answer: (c).5.0 m
Question 52. In the design of a paddle agitator, the ratio of paddle diameter to tank diameter is normally taken as
  1.    0.1
  2.    0.8
  3.    0.25
  4.    0.5
 Discuss Question
Answer: Option B. -> 0.8
Answer: (b).0.8
Question 53. The addition of antifoams to an aerated bioreactor will decrease oxygen transfer rates because antifoams
  1.    increase the tendency of bubbles to coalesce
  2.    tend to accumulate in the gas liquid interface
  3.    reduce the surface tension of the liquid
  4.    All of the above answers
 Discuss Question
Answer: Option D. -> All of the above answers
Answer: (d).All of the above answers
Question 54. The dynamic technique is based on the
  1.    oxygen material balance in an aerated batch fermenter during the growth of microorganisms
  2.    change of the oxygen concentration
  3.    oxidation of the sodium sulfite to sodium sulfate
  4.    oxygen material balance in a fermenter
 Discuss Question
Answer: Option A. -> oxygen material balance in an aerated batch fermenter during the growth of microorganisms
Answer: (a).oxygen material balance in an aerated batch fermenter during the growth of microorganisms
Question 55. Industrial paddle agitators turn at the speed of
  1.    20 and 150 rpm
  2.    150 and 300 rpm
  3.    400 and 800 rpm
  4.    1150 rpm
 Discuss Question
Answer: Option A. -> 20 and 150 rpm
Answer: (a).20 and 150 rpm
Question 56. The oxygen absorption rate can be determined by
  1.    sodium sulfite oxidation method
  2.    dynamic gassing out technique
  3.    direct measurement
  4.    all of these
 Discuss Question
Answer: Option D. -> all of these
Answer: (d).all of these
Question 57. Which of the following will have the largest interfacial area per unit volume?
  1.    A bubble with a diameter of 1 mm
  2.    A bubble with a diameter of 5 mm
  3.    A bubble with a diameter of 15 mm
  4.    A bubble with a diameter of 50 mm
 Discuss Question
Answer: Option A. -> A bubble with a diameter of 1 mm
Answer: (a).A bubble with a diameter of 1 mm
Question 58. Which device is commonly used for measuring the rate of rotation (rpm) of the stirrer shaft?
  1.    Anemometer
  2.    Manometer
  3.    Tachometer
  4.    Barometer
 Discuss Question
Answer: Option C. -> Tachometer
Answer: (c).Tachometer
Question 59. Laminar flow range of mixing speed is obtained for
  1.    Rei<10
  2.    10<Rei<104
  3.    Rei>104
  4.    None of these
 Discuss Question
Answer: Option A. -> Rei<10
Answer: (a).Rei<10
Question 60. A higher liquid height will lead to a higher gas hold up by which the oxygen transfer rate will be
  1.    higher throughout the reactor
  2.    lower throughout the reactor
  3.    higher at the base of the reactor
  4.    lower at the base of the reactor
 Discuss Question
Answer: Option C. -> higher at the base of the reactor
Answer: (c).higher at the base of the reactor

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