Fermentation Reactors – Section 1

36. Unsteady state mass balance for dynamic model of continuous stirred tank reactor (CSTR) is

A. time rate of total amount in rector = rate of addition to reactor -rate of removal + rate of formation
B. total amount in rector = rate of addition to reactor – rate of removal + rate of formation
C. rate of total amount in rector = rate of addition to reactor – rate of removal + rate of formation
D. none of the above

Correct Answer: A. time rate of total amount in rector = rate of addition to reactor -rate of removal + rate of formation

37. A fed-batch reactor initially contains 2 liters of medium. If it was fed at 1 liter per hour, then after 10 hours, the volume of the reactor will be

A. 1 liter
B. 2 liter
C. 3 liter
D. 13 liter

Correct Answer: B. 2 liter

38. A Bacillus sp. produces an antibiotic only during the stationary phase when grown in batch culture. If grown in a 5-liter continuous culture, the steady-state productivity of the antibiotic

A. will increase until the culture washes out
B. will decrease after washout
C. will be zero
D. will be infinite

Correct Answer: C. will be zero

39. In a fluidized bed reactor, the function of the disengagement zone is to

A. reduce loss of particles from the reactor
B. reduce the velocity of the particles near the surface of the reactor
C. reduce foaming problems
D. all of the above

Correct Answer: D. all of the above

40. 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?

A. Batch fermenter with a high initial glucose concentration
B. Continuous fermenter with a low initial glucose concentration
C. Fed-batch fermenter
D. All of the above

Correct Answer: C. Fed-batch fermenter

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