200 Best MCQs on Fermentation Reactors- biochemical engineering
Q49). In fed batch bioreactor modelling, the rate of change in the bioreactor volume is assumed to be equal to
a).flow rate
b).initial volume
c).volume of solids in the reactor
d).none of these
Correct Answer:
flow rate
Explaination:
Q50). Monoclonal antibodies are typically produced in fed batch reactors because
a).hybridoma cells ferment at high maltose concentrations
b).hybridoma cells yield higher lactate at high glucose concentrations
c).hybridoma cells respire at high glucose concentrations
d).none of the above
Correct Answer:
hybridoma cells yield higher lactate at high glucose concentrations
Explaination:
Q51). In plug flow tubular reactor the axial velocity profile on cross-section will be
a).constant
b).varying with time
c).non-linear
d).power function of time
Correct Answer:
constant
Explaination:
Q52). Production of organic acids in batch culture is generally growth associated phase followed by non-growth associated production. The probable reason for this is that
a).organic acids uncouple catabolism from anabolism
b).biomass yields increase as the fermentation proceeds
c).organic acids are secondary metabolites
d).high concentrations of organic acid promote the growth of the microbial population
Correct Answer:
organic acids uncouple catabolism from anabolism
Explaination:
Q53). The concentration of biomass in a continuous stirred tank reactor is 20 g dry weight per litre. What would be the concentration of biomass in the effluent?
a).Greater than 20 g dry weight per litre
b).Approximately 20 g dry weight per litre
c).Lesser than 20 g dry weight per litre
d).More than 30 g dry weight per litre
Correct Answer:
Approximately 20 g dry weight per litre
Explaination:
Q54). The ideal tubular-flow fermenter without radial variations is called a
a).plug flow fermenter
b).continuous stirred tank fermenter (CSTF)
c).column fermenter
d).any intensity of dilution rate near the wash out points
Correct Answer:
plug flow fermenter
Explaination:
Q55). Pseudo-steady state in a continuous reactor refers to a reactor in which
a).Pseudomonads are being cultured
b).concentration oscillate around a mean value
c).concentration increase with time
d).concentration decrease with time
Correct Answer:
concentration oscillate around a mean value
Explaination:
Q56). The toxicity of organic acids to cells
a).enhances as the pH falls
b).reduces as the pH falls
c).is not affected by pH
d).is highest at pH 7.0
Correct Answer:
enhances as the pH falls
Explaination: