200 Best MCQs on Fermentation kinetics- biochemical engineering
Q57). The contents in bubble column and air lift reactor are mixed through
a).compressed air
b).a mechanical internal moving part
c).external pumping
d).any of these
Correct Answer:
compressed air
Explaination:
Q58). Which of the following statements would be appropriate while comparing bubble column and air lift fermenter of the same size?
a).The average bubble size is smaller in an airlift bioreactor
b).Oxygen transfer rate is higher in an airlift bioreactor
c).The surface area for gas exchange is higher in an airlift bioreactor
d).All of the above
Correct Answer:
All of the above
Explaination:
Q59). During the lag phase
a).cells just start growing
b).cells synthesize new proteins and membrane components
c).cells produce antibiotics to kill competing organisms
d).cells simply grow slowly
Correct Answer:
cells synthesize new proteins and membrane components
Explaination:
Q60). Concentration of the growth limiting substrate means
a).trace elements concentration
b).the concentration of the substrate that controls the growth rate of the cells
c).sugar concentration in the fermentation medium
d).dissolved oxygen concentration
Correct Answer:
the concentration of the substrate that controls the growth rate of the cells
Explaination:
Q61). Tower fermentors are used for
a).continuous penicillin production
b).continuous beer production
c).production of enzymes
d).batch production of beer
Correct Answer:
continuous beer production
Explaination:
Q62). In wastewater treatment, which bioreactor is generally used?
a).Plug flow reactor
b).Trickle bed reactor
c).Tower fermentor
d).CSTR
Correct Answer:
Trickle bed reactor
Explaination:
Q63). The contents in stirred tank rector are mixed through
a).compressed air
b).a mechanical agitator
c).external pumping
d).any of these
Correct Answer:
a mechanical agitator
Explaination:
Q64). The height to diameter ratio (H/D) for the tank fermenters is
a).<3
b).>3
c).<1.5
d).>1.5
Correct Answer:
<3
Explaination: