Fermentation Kinetics – Section 2

26. The height to diameter ratio (H/D) for the tank fermenters is

A.<3
B.>3
C.<1.5
D.>1.5

Correct Answer: B. a mechanical agitator

27. The relatively large volume (10 to 40% of total fermenter volume) of the seed culture is employed to

A. increase the overall fermentation time
B. increase the overall yield of biomass
C. decrease the overall fermentation time
D. decrease the overall yield of product

Correct Answer: C. decrease the overall fermentation time

28. In an airlift bioreactor, the air sparging region is called

A. downcomer
B. disengagement zone
C. air riser
D. none of these

Correct Answer: C. air riser

29. The air riser is located on the outside of the draft tube for the large-scale airlift bioreactors because of

A. higher oxygen transfer rates
B. a small sparge ring
C. better heat transfer efficiencies
D. all of these

Correct Answer: C. better heat transfer efficiencies

30. At the end of the lag phase, when growth begins, the division rate increases gradually and reaches a maximum value in the exponential growth period. This transitional period is commonly called the accelerated growth phase and is often included as a part of the

A. lag phase
B. stationary phase
C. death phase
D. exponential growth phase

Correct Answer: A. lag phase

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