Questions and answers for exam Preparation

MCQs

Total Questions : 146 | Page 3 of 15 pages

Question 21. The function of the disengagement zone in an airlift fermenter is to

prevent CO₂ rich bubbles from entering the downcomer
reduce the velocity of the bubbles
reduce liquid loss as aerosols
all of the above

Discuss Question

Answer: Option D. -> all of the above
Answer: (d).all of the above

Question 22. In the accelerated phase, cell starts to

increase and the division rate increases to reach a maximum
decrease and the division rate increases to reach a maximum
increase and the division rate decreases to reach a maximum
increase and the division rate increases to reach a minimum

Discuss Question

Answer: Option A. -> increase and the division rate increases to reach a maximum
Answer: (a).increase and the division rate increases to reach a maximum

Question 23. The monod model predicts that the specific growth rate

will increase with the concentration of the growth limiting substrate until it reaches a maximum value
will decrease with the concentration of the growth limiting substrate
will increase with the concentration of the growth limiting substrate
does not depend on growth limiting substrate

Discuss Question

Answer: Option A. -> will increase with the concentration of the growth limiting substrate until it reaches a maximum value
Answer: (a).will increase with the concentration of the growth limiting substrate until it reaches a maximum value

Question 24. Stationary phase is described as

no further increase in the cell population after a maximum value
deceleration of growth and division rate after the growth rate reaches a maximum
acceleration of growth and division rate after the growth rate reaches a maximum
deceleration of growth and division rate after the growth rate reaches a minimum

Discuss Question

Answer: Option A. -> no further increase in the cell population after a maximum value
Answer: (a).no further increase in the cell population after a maximum value

Question 25. A mixed fermentation is one, which produces

both alcohol and carbon dioxide
both acid and carbon dioxide
both acid and alcohol
several different kinds of acid

Discuss Question

Answer: Option C. -> both acid and alcohol
Answer: (c).both acid and alcohol

Question 26. Which of the following is correct for the prediction of time requirement in a batch fermenter?

Carrying out experiments
Mathematical modelling of the fermentation process
Both (a) and (b)
It is impossible to predict the time required for fermentation

Discuss Question

Answer: Option C. -> Both (a) and (b)
Answer: (c).Both (a) and (b)

Question 27. The number of baffles in a standard stirred tank bioreactor is

Discuss Question

Answer: Option C. -> 4
Answer: (c).4

Question 28. The contents in jet loop reactor are mixed through

compressed air
a mechanical agitator
external pumping
any of these

Discuss Question

Answer: Option C. -> external pumping
Answer: (c).external pumping

Question 29. The specific growth rate (μ) is defined as

the concentration of biomass in the reactor
rate of increase of total biomass in a reactor
the rate of individual cells division or increase in their biomass
the rate of cell death

Discuss Question

Answer: Option C. -> the rate of individual cells division or increase in their biomass
Answer: (c).the rate of individual cells division or increase in their biomass

Question 30. In an airlift bioreactor, the spent gases released from the liquid are called