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Total Questions : 114 | Page 11 of 12 pages
Question 101. . Fed batch reactors is used to produce vinegar because
  1.    it can maintain low ethanol concentrations
  2.    it can maintain low acetic acid concentrations
  3.    acetic acid bacteria tend to ferment at high ethanol concentrations
  4.    all of the above
 Discuss Question
Answer: Option A. -> it can maintain low ethanol concentrations
Question 102. . When a culture of fermenting yeast becomes metabolically uncoupled, ethanol
  1.    becomes a secondary metabolite
  2.    production becomes growth associated
  3.    production becomes non-growth associated
  4.    becomes a growth nutrient
 Discuss Question
Answer: Option C. -> production becomes non-growth associated
Question 103. . Mixing profiles closest to plug flow are observed in
  1.    continuous packed bed reactor
  2.    stirred tank reactor with biomass recycles
  3.    continuous fluidized bed bioreactor
  4.    all of these
 Discuss Question
Answer: Option A. -> continuous packed bed reactor
Question 104. . On a glucose medium, the growth of an organism is characterized by the following Monod model and stoichiometric parameters μm = 0.3 h-1, Ks =0.05 g.l-1 and Yxs = 0.3 g.g-1 When this organism is grown in a 2 litre continuous on a medium containing 10 g.l-1 of glucose added at 1 l.h-1, the steady state concentration of biomass in the reactor will be
  1.    0 g.l-1
  2.    0.4 g.l-1
  3.    0.5 g.l-1
  4.    10 g.l-1
 Discuss Question
Answer: Option A. -> 0 g.l-1
Question 105. . Unsteady state mass balance for dynamic model of continuous stirred tank reactor (CSTR) is
  1.    time rate of total amount in rector = rate of addition to reactor -rate of removal + rate of formation
  2.    total amount in rector = rate of addition to reactor - rate of removal + rate of formation
  3.    rate of total amount in rector = rate of addition to reactor - rate of removal + rate of formation
  4.    none of the above
 Discuss Question
Answer: Option A. -> time rate of total amount in rector = rate of addition to reactor -rate of removal + rate of formation
Question 106. . A fed-batch reactor initially contains 2 litre of medium. If it was fed at 1 litre per hour, then after 10 hours, the volume of the reactor will be
  1.    1 litre
  2.    2 litre
  3.    3 litre
  4.    13 litre
 Discuss Question
Answer: Option B. -> 2 litre
Question 107. . A Bacillus sp. produces an antibiotic only during the stationary phase when grown in a batch culture. If grown in a 5 litre continuous culture, the steady state productivity of the antibiotic
  1.    will increase until the culture washes out
  2.    will decrease after washout
  3.    will be zero
  4.    will be infinite
 Discuss Question
Answer: Option C. -> will be zero
Question 108. .  In a fluidized bed reactor, the function of the disengagement zone is to
  1.    reduce loss of particles from the reactor
  2.    reduce the velocity of the particles near the surface of the reactor
  3.    reduce foaming problems
  4.    all of the above
 Discuss Question
Answer: Option D. -> all of the above
Question 109. . Saccharomyces cerevisiae produces high biomass yields at low glucose concentrations and high dissolved oxygen concentrations. Which of the following should be followed for maximizing its biomass productivity?
  1.    Batch fermenter with a high initial glucose concentration
  2.    Continuous fermenter with a low initial glucose concentration
  3.    Fed batch fermenter
  4.    All of the above
 Discuss Question
Answer: Option C. -> Fed batch fermenter
Question 110. . Unsteady state mass balance for dynamic model of continuous stirred tank reactor (CSTR) is
  1.    time rate of total amount in rector = rate of addition to reactor -rate of removal + rate of formation
  2.    total amount in rector = rate of addition to reactor - rate of removal + rate of formation
  3.    rate of total amount in rector = rate of addition to reactor - rate of removal + rate of formation
  4.    none of the above
 Discuss Question
Answer: Option A. -> time rate of total amount in rector = rate of addition to reactor -rate of removal + rate of formation

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