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MCQs

Total Questions : 146 | Page 6 of 15 pages
Question 51. In wastewater treatment, which bioreactor is generally used?
  1.    Plug flow reactor
  2.    Trickle bed reactor
  3.    Tower fermentor
  4.    CSTR
 Discuss Question
Answer: Option B. -> Trickle bed reactor
Answer: (b).Trickle bed reactor
Question 52. The contents in stirred tank rector are mixed through
  1.    compressed air
  2.    a mechanical agitator
  3.    external pumping
  4.    any of these
 Discuss Question
Answer: Option B. -> a mechanical agitator
Answer: (b).a mechanical agitator
Question 53. An internal draft tube is preferrred to an external draft tube because
  1.    it is easier to clean and sterilize a reactor
  2.    it is cheaper to build a reactor with an internal draft tube
  3.    Both (a) and (b)
  4.    none of the above
 Discuss Question
Answer: Option A. -> it is easier to clean and sterilize a reactor
Answer: (a).it is easier to clean and sterilize a reactor
Question 54. The application of just in time (JIT) manufacturing techniques in biotechnology is important because
  1.    raw materials used in biotechnology are biodegradable
  2.    the products of biotechnology are biodegradable
  3.    it is a very competitive business
  4.    all of the above
 Discuss Question
Answer: Option D. -> all of the above
Answer: (d).all of the above
Question 55. A functional relationship between the specific growth rate and essential compounds concentration was proposed by Monod in
  1.    1958
  2.    1946
  3.    1942
  4.    1950
 Discuss Question
Answer: Option C. -> 1942
Answer: (c).1942
Question 56. Residence time distribution (RTD) of a reactor is independent of
  1.    micro mixing
  2.    volume of reactor
  3.    height of the reactor
  4.    width of the reactor
 Discuss Question
Answer: Option A. -> micro mixing
Answer: (a).micro mixing
Question 57. The optical density sometimes drops during the lag phase because
  1.    cells tend to grow without dividing leading to a decrease in the surface area to volume ratio
  2.    of fast cell growth causing them to fill up with DNA
  3.    cells swell up with water
  4.    cells swell up with RNA
 Discuss Question
Answer: Option A. -> cells tend to grow without dividing leading to a decrease in the surface area to volume ratio
Answer: (a).cells tend to grow without dividing leading to a decrease in the surface area to volume ratio
Question 58. Heat transfer rates (per unit volume) will be lowest in
  1.    Stirred tank bioreactor with biomass recycle
  2.    Continuous air lift bioreactor
  3.    Continuous packed bed reactor
  4.    Continuous fluidized bed bioreactor
 Discuss Question
Answer: Option C. -> Continuous packed bed reactor
Answer: (c).Continuous packed bed reactor
Question 59. The Monod Model relates
  1.    substrate utilized with the biomass consumption
  2.    specific growth rate to the substrate availability
  3.    yield with the biomass utilization
  4.    the biomass concentration with specific growth rate
 Discuss Question
Answer: Option B. -> specific growth rate to the substrate availability
Answer: (b).specific growth rate to the substrate availability
Question 60. The height to diameter ratio (H/D) for the column fermenters is
  1.    <3
  2.    >3
  3.    <1.5
  4.    >1.5
 Discuss Question
Answer: Option B. -> >3
Answer: (b).>3

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