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MCQs

Total Questions : 146 | Page 14 of 15 pages
Question 131. . The contents in bubble column and air lift reactor are mixed through
  1.    compressed air
  2.    a mechanical internal moving part
  3.    external pumping
  4.    any of these
 Discuss Question
Answer: Option A. -> compressed air
Question 132. . Which of the following statements would be appropriate while comparing bubble column and air lift fermenter of the same size?
  1.    The average bubble size is smaller in an airlift bioreactor
  2.    Oxygen transfer rate is higher in an airlift bioreactor
  3.    The surface area for gas exchange is higher in an airlift bioreactor
  4.    All of the above
 Discuss Question
Answer: Option D. -> All of the above
Question 133. . During the lag phase
  1.    cells just start growing
  2.    cells synthesize new proteins and membrane components
  3.    cells produce antibiotics to kill competing organisms
  4.    cells simply grow slowly
 Discuss Question
Answer: Option B. -> cells synthesize new proteins and membrane components
Question 134. . Concentration of the growth limiting substrate means
  1.    trace elements concentration
  2.    the concentration of the substrate that controls the growth rate of the cells
  3.    sugar concentration in the fermentation medium
  4.    dissolved oxygen concentration
 Discuss Question
Answer: Option B. -> the concentration of the substrate that controls the growth rate of the cells
Question 135. . Tower fermentors are used for
  1.    continuous penicillin production
  2.    continuous beer production
  3.    production of enzymes
  4.    batch production of beer
 Discuss Question
Answer: Option B. -> continuous beer production
Question 136. . 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
Question 137. . 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
Question 138. . The height to diameter ratio (H/D) for the tank fermenters is
 Discuss Question
Answer: Option B. -> a mechanical agitator
Question 139. . The relatively large volume (10 to 40% of total fermenter volume) of the seed culture is employed to
  1.    increase the overall fermentation time
  2.    increase the overall fermentation time
  3.    decrease the overall fermentation time
  4.    decrease the overall yield of product
 Discuss Question
Answer: Option C. -> decrease the overall fermentation time
Question 140. . In an airlift bioreactor, the air sparging region is called
  1.    downcomer
  2.    disengagement zone
  3.    air riser
  4.    none of these
 Discuss Question
Answer: Option C. -> air riser

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