200 Best MCQs on Fermentation kinetics- biochemical engineering

Q17). Fermentor should be filled with medium upto

a).65-70%
b).70-75%
c).75-80%
d).80-85%

Correct Answer:
75-80%
Explaination:

Q18). Bacterial growth curve is obtained by plotting

a).number of cells versus time
b).number fo spores versus time
c).log of number of cells versus time
d).log of number of cells survived versus time

Correct Answer:
log of number of cells versus time
Explaination:

Q19). When intracellular enzymes of whole cells are to be used in a bio-conversion process, it is often necessary to____________the cells.

a).permeabilize
b).lyophilize
c).heat-kill
d).denature

Correct Answer:
permeabilize
Explaination:

Q20). Heat transfer rates (per unit volume) will be lowest in

a).Stirred tank bioreactor with biomass recycle
b).Continuous air lift bioreactor
c).Continuous packed bed reactor
d).Continuous fluidized bed bioreactor

Correct Answer:
Continuous packed bed reactor
Explaination:

Q21). The function(s) of the draft tube in an airlift bioreactor is

a).to reduce bubble coalescence
b).to improve circulation
c).to even out shear conditions throughout the reactor
d).all of the above

Correct Answer:
all of the above
Explaination:

Q22). The Monod Model relates

a).substrate utilized with the biomass consumption
b).specific growth rate to the substrate availability
c).yield with the biomass utilization
d).the biomass concentration with specific growth rate

Correct Answer:
specific growth rate to the substrate availability
Explaination:

Q23). The height to diameter ratio (H/D) for the column fermenters is

a).<3
b).>3
c).<1.5
d).>1.5

Correct Answer:
>3
Explaination:

Q24). The high oxygen transfer efficiencies of airlift bioreactors is due to

a).the large aspect ratio of the reactor, which leads to a high gas hold-up
b).the large aspect ratio of the reactor, which leads to a high oxygen solubility at the base of the reactor
c).the draft tube, which reduces bubble coalescence in the reactor
d).all of the above