Question is ⇒ Residence time distribution (RTD) of a reactor is independent of, Options are ⇒ (A) micro mixing, (B) volume of reactor, (C) height of the reactor, (D) width of the reactor, (E) , Leave your comments or Download question paper.

Question is ⇒ Residence time distribution (RTD) of a reactor is independent of, Options are ⇒ (A) micro mixing, (B) volume of reactor, (C) height of the reactor, (D) width of the reactor, (E) , Leave your comments or Download question paper. Previous question Next question


Q1.	Residence time distribution (RTD) of a reactor is independent of
A.	micro mixing [Correct Answer]
B.	volume of reactor [Wrong Answer]
C.	height of the reactor [Wrong Answer]
D.	width of the reactor [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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⇒ If the specific growth rate, μ. is constant with time during the exponential growth period, the equation correlating bacterial number density C_n), cell number concentration with respect to time can be expressed as
C_n= C_n₀ exp[μ (t - t₀)]
C_n₀ = C_n exp[μ (t - t₀)]
C_n/C_n₀ =(1/μ)exp(t-t₀)
C_n₀ / C_n = (1/μ)exp(t-t₀)

⇒ 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

⇒ 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

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

⇒ Turbidostat is recommended when continuous fermentation needs to be carried out at
high dilution rates near the washout point
low dilution rates near the washout point
moderate dilution rates near the washout point
any intensity of dilution rates near the washout point

⇒ Heat transfer rates (per unit volume) will be lowest in
Stirred tank bioreactor with biomass recycle
Continuous air lift bioreactor
Continuous packed bed reactor
Continuous fluidized bed bioreactor

⇒ 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

⇒ The application of just in time (JIT) manufacturing techniques in biotechnology is important because
raw materials used in biotechnology are biodegradable
the products of biotechnology are biodegradable
it is a very competitive business (d) all of the above
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

⇒ Concentration of the growth limiting substrate means
trace elements concentration
the concentration of the substrate that controls the growth rate of the cells
sugar concentration in the fermentation medium
dissolved oxygen concentration

⇒ 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

⇒ 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

⇒ 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 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 contents in jet loop reactor are mixed through
compressed air
a mechanical agitator
external pumping
any of these

⇒ The increased air flow rate in bubble column fermenter can cause excessive foaming and high retention of air bubbles in the column which
decreases the productivity of the fermenter
increases the productivity of the fermenter
modestly increases the productivity of the fermenter
does not affect on the productivity

⇒ Why a T-flask used in small-scale cell culture is incubated in a horizontal position?
To save space
To increase the surface area of the liquid-air interface
Both (a) and (b)
To increase the rate of oxygen transfer into the liquid

⇒ 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

⇒ 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

⇒ A functional relationship between the specific growth rate and essential compounds concentration was proposed by Monod in
1958
1946
1942
1950

⇒ The Monod Model relates
substrate utilized with the biomass consumption
specific growth rate to the substrate availability
yield with the biomass utilization
the biomass concentration with specific growth rate

⇒ The region of an airlift bioreactor in which the liquid travels in a downward direction is called the
downcomer
disengagement zone
air riser
flotsam

⇒ 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

⇒ Diauxie is
growth factors
microbiological die off
the simultaneous uptake of nutrients
the stagewise uptake of nutrients

⇒ During the exponential phase the maximum specific growth rate equals specific growth rate as
concentration of the growth limiting substrate is much less than the monod constant
concentration of growth limiting substrate is much greater than the monod constant
specific growth rate increases exponentially
concentration of the growth limiting substrate is equal to the monod constant

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

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

⇒ Stirred tank fermenter (STF) can be employed for
aerobic fermentation of a wide range of cells including microbial, animal and plant cells
anaerobic fermentation of a wide range of cells including microbial, animal and plant cells
Both (a) and (b)
anaerobic fermentation of plant cells only

⇒ 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