Question is ⇒ To describe components of an airlift bioreactor which of the follow-ings are generally included?, Options are ⇒ (A) Disengagement zone, air riser, downcomer, (B) Flotsam, jetsam, downzone, (C) Air comer, disentanglement zone, downsizer, (D) All of the above, (E) , Leave your comments or Download question paper.

Question is ⇒ To describe components of an airlift bioreactor which of the follow-ings are generally included?, Options are ⇒ (A) Disengagement zone, air riser, downcomer, (B) Flotsam, jetsam, downzone, (C) Air comer, disentanglement zone, downsizer, (D) All of the above, (E) , Leave your comments or Download question paper. Previous question Next question


Q1.	To describe components of an airlift bioreactor which of the follow-ings are generally included?
A.	Disengagement zone, air riser, downcomer [Correct Answer]
B.	Flotsam, jetsam, downzone [Wrong Answer]
C.	Air comer, disentanglement zone, downsizer [Wrong Answer]
D.	All of the above [Wrong Answer]
View Answer 1 -1 Explanation:- Answer : A Discuss it below : !! OOPS Login [Click here] is required to post your answer/result Help other students, write article, leave your comments

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⇒ In a batch reactor specific growth rate
remains constant throughout the process
increases exponentially
changes during the fermentation
is highest during the stationary phase

⇒ The number of baffles in a standard stirred tank bioreactor is
8
6
4
2

⇒ Fermentor should be filled with medium upto
65-70%
70-75%
75-80%
80-85%

⇒ The main function(s) of a draft tube in an air lift fermenter is/are to
increase the solubility of oxygen
distribute shear forces throughout the reactor and minimise bubble coalescence
concentrate shear forces around the sparger
concentrate shear forces near the disengagement zone

⇒ When intracellular enzymes of whole cells are to be used in a bio-conversion process, it is often necessary to____________the cells.
permeabilize
lyophilize
heat-kill
denature

⇒ The contents in stirred tank rector are mixed through
compressed air
a mechanical agitator
external pumping
any of these

⇒ The height to diameter ratio (H/D) for the column fermenters is
<3
>3
<1.5
>1.5

⇒ Residence time distribution (RTD) of a reactor is independent of
micro mixing
volume of reactor
height of the reactor
width of the reactor

⇒ An internal draft tube is preferrred to an external draft tube because
it is easier to clean and sterilize a reactor
it is cheaper to build a reactor with an internal draft tube
Both (a) and (b)
none of the above

⇒ In the death phase
nutrients available for the cells are depleted and begin to die
the number of viable cells will increase
nutrients available for cells are replenished and start to multiply
none of the above

⇒ The dilution rate, D is defined as(where F = volumetric flow rate, V_R = total volume of culture in the reactor and μ specific growth rate)
F/V_R
V_R/F
μ/F
F/μ

⇒ 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

⇒ The contents in bubble column and air lift reactor are mixed through
compressed air
a mechanical internal moving part
external pumping
any of these

⇒ The function(s) of the draft tube in an airlift bioreactor is
to reduce bubble coalescence
to improve circulation
to even out shear conditions throughout the reactor
all of the above

⇒ Lag phase occurs mainly due to
acclimatization with new environment and substrate
higher growth temperature
substrate disliking
variation in substrate concentration

⇒ 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

⇒ An open system in which the growth rate is maintained by adding a nutrient (present in limiting quantities) at the same rate as that medium containing micro-organisms is removed is called
manostat
chemostat
turbidostat
culturostat

⇒ Which of the following is incorrect?
The mechanical agitation and aeration are effective for suspension of cells
The mechanical agitation and aeration are effective for mixing the medium
STF can't be used for high viscosity medium
The mechanical agitation and aeration are effective for oxygenation

⇒ Chemostats work on the principle of
maintaining constant volume of culture medium
maintaining continuous flow of nutrients
maintaining uniform nutrients concentration
operating at higher pressure

⇒ The relatively large volume (10 to 40% of total fermenter volume) of the seed culture is employed to
increase the overall fermentation time
increase the overall yield of biomass
decrease the overall fermentation time
decrease the overall yield of product

⇒ In an airlift bioreactor, the air sparging region is called
downcomer
disengagement zone
air riser
none of these

⇒ In wastewater treatment, which bioreactor is generally used?
Plug flow reactor
Trickle bed reactor
Tower fermentor
CSTR

⇒ The phenomenon in which substrates are used in a sequential manner is known as
trans-substrate genesis
dialism
diauxie
multiplicity

⇒ The high oxygen transfer efficiencies of airlift bioreactors is due to
the large aspect ratio of the reactor, which leads to a high gas hold-up
the large aspect ratio of the reactor, which leads to a high oxygen solubility at the base of the reactor
the draft tube, which reduces bubble coalescence in the reactor
all of the above

⇒ The air riser is located on the outside of the draft tube for the large-scale airlift bioreactors because of
higher oxygen transfer rates
a small sparge ring
better heat transfer efficiencies
all of these

⇒ The advantage of airlift bioreactors over stirred tank bioreactors of a similar size is
higher oxygen transfer rates
more uniform shear conditions
both (a) and (b)
less foaming

⇒ At the end of the lag phase, when growth begins, the division rate increases gradually and reaches a maximum value in the exponential growth period. This transitional period is commonly called the accelerated growth phase and is often included as a part of the
lag phase
stationary phase
death phase
exponential growth phase

⇒ Which of the following is an example of a mathematical model?
Volume of cuboid = length x breadth x height
The Monod Model
The Michaelis Menten Equation
All of the above

⇒ In an airlift bioreactor, the spent gases released from the liquid are called
downcomer
disengagement zone
air riser
flotsam

⇒ Tower fermentors are used for
continuous penicillin production
continuous beer production
production of enzymes
batch production of beer