200 Best MCQs on Fermentation kinetics- biochemical engineering
Q65). 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:
decrease the overall fermentation time
Explaination:
Q66). In an airlift bioreactor, the air sparging region is called
a).downcomer
b).disengagement zone
c).air riser
d).none of these
Correct Answer:
air riser
Explaination:
Q67). 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:
better heat transfer efficiencies
Explaination:
Q68). 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:
lag phase
Explaination:
Q69). Which of the following(s) is/are considered the limitations of the exponential growth model?
a).Only predicts that cells grow exponentially during the log phase
b).It does not consider factors that causes cells growth to stop or slow
c).Predicts cell growth at a linear rate
d).All of the above
Correct Answer:
It does not consider factors that causes cells growth to stop or slow
Explaination:
Q70). To describe components of an airlift bioreactor which of the follow-ings are generally included?
a).Disengagement zone, air riser, downcomer
b).Flotsam, jetsam, downzone
c).Air comer, disentanglement zone, downsizer
d).All of the above
Correct Answer:
Disengagement zone, air riser, downcomer
Explaination: