200 Best MCQs on Fermentation kinetics- biochemical engineering
Q49). Lag phase occurs mainly due to
a).acclimatization with new environment and substrate
b).higher growth temperature
c).substrate disliking
d).variation in substrate concentration
Correct Answer:
acclimatization with new environment and substrate
Explaination:
Q50). In a batch reactor specific growth rate
a).remains constant throughout the process
b).increases exponentially
c).changes during the fermentation
d).is highest during the stationary phase
Correct Answer:
changes during the fermentation
Explaination:
Q51). Turbidostat is recommended when continuous fermentation needs to be carried out at
a).high dilution rates near the washout point
b).low dilution rates near the washout point
c).moderate dilution rates near the washout point
d).any intensity of dilution rates near the washout point
Correct Answer:
high dilution rates near the washout point
Explaination:
Q52). The advantage of airlift bioreactors over stirred tank bioreactors of a similar size is
a).higher oxygen transfer rates
b).more uniform shear conditions
c).both (a) and (b)
d).less foaming
Correct Answer:
both (a) and (b)
Explaination:
Q53). Stirred tank fermenter (STF) can be employed for
a).aerobic fermentation of a wide range of cells including microbial, animal and plant cells
b).anaerobic fermentation of a wide range of cells including microbial, animal and plant cells
c).Both (a) and (b)
d).anaerobic fermentation of plant cells only
Correct Answer:
Both (a) and (b)
Explaination:
Q54). The specific growth rate is affected by
a).sabstrate concentration
b).product concentration
c).oxygen supply
d).all of these
Correct Answer:
all of these
Explaination:
Q55). The main function(s) of a draft tube in an air lift fermenter is/are to
a).increase the solubility of oxygen
b).distribute shear forces throughout the reactor and minimise bubble coalescence
c).concentrate shear forces around the sparger
d).concentrate shear forces near the disengagement zone
Correct Answer:
distribute shear forces throughout the reactor and minimise bubble coalescence
Explaination:
Q56). Which of the following is incorrect?
a).The mechanical agitation and aeration are effective for suspension of cells
b).The mechanical agitation and aeration are effective for mixing the medium
c).STF can’t be used for high viscosity medium
d).The mechanical agitation and aeration are effective for oxygenation
Correct Answer:
STF can’t be used for high viscosity medium
Explaination: