Online Biochemical Engineering Test - Biochemical Engineering Test 10

Instruction:

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  • Total number of questions: 20.
  • Time allotted: 30 minutes.
  • Each question carries 1 mark; there are no negative marks.
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  • All the best!

Marks : 2/20


Total number of questions
20
Number of answered questions
0
Number of unanswered questions
20
Test Review : View answers and explanation for this test.

1.
If a reaction occurs in the absence of inhibitor with rate ν0 and in the presence of inhibitor with rate νi, the degree of inhibition is defined as
0 - νi)/ν0
0 + νi)/ν0
0νi)/ν0
0i)/νi
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(Not Answered)
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2.
Various techniques are available for determining the effective diffusivity of solute in gel. Thin disk method uses
a diffusion cell with two compartments divided by a thin gel
a diffusion cell with two compartments
a diffusion cell with two compartments plus by a thin gel
a diffusion cell with two compartments multiply by a thin gel
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3.
The enzyme β-galactosidase is also known as
lactase
EC3.2.1.23
both (a) and (b)
isomerase
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(Not Answered)
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4.
The main reason for production of antibiotics in fed batch reactors is
the presence of precursors is often toxic to the cells
higher yields when cells enter the stationary phase
higher yields when cell growth slows
all of the above
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5.
Which of the following is used to calculate mass of substrate in the reactor?
Flow rate x substrate concentration in the reactor
Volume of reactor x substrate concentration in reactor
Flow rate x mass of reactor
Volume of reactor x Flow rate
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6.
The fastest route of NADH reoxidation is
aerobic respiration
anaerobic respiration
fermentation
decomposition
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7.
Which of the following organisms will continue their metabolism at high substrate concentrations?
Pseudomonas aeruginosa
Saccharomyces cerevisiae
Bacillus subtilis
Escherichia coli
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8.
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
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9.
The region of an airlift bioreactor in which the liquid travels in a downward direction is called the
downcomer
disengagement zone
air riser
flotsam
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10.
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
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11.
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
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12.
The specific growth rate is affected by
sabstrate concentration
product concentration
oxygen supply
all of these
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13.
In a batch reactor specific growth rate
remains constant throughout the process
increases exponentially
changes during the fermentation
is highest during the stationary phase
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14.
To describe components of an airlift bioreactor which of the follow-ings are generally included?
Disengagement zone, air riser, downcomer
Flotsam, jetsam, downzone
Air comer, disentanglement zone, downsizer
All of the above
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15.
A fermentation system has a KLa of 3 s-1 and a C0* of 5 ppm of O2. If the bulk liquid is saturated with oxygen then the oxygen transfer rate will be equal to
zero
3 mg.l-1.s-1
5 mg.l-1.s-1
15 mg.l-1.s-1
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16.
Higher temperatures affect oxygen transfer rates by
increasing KLa but lowering C*o
lowering KLa but increasing C*o
increasing KLa and increasing Co
lowering KLa and lowering Co
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17.
A rheopectic fluid is one in which the viscosity
is constant regardless of the stirrer speed or mixing time
changes during mixing but returns to its original state after mixing
increases with mixing time
decreases with mixing time
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18.
The efficiency of fibrous filter by combined mechanism is given by(where ηimpintdif are the efficiencies by impaction, interception and diffusion respectively)
1 - ηimpηintηdif
1 - (1 - ηimp)(1 - ηint)( 1 - ηdif)
1 - ( ηimpηintdif)
None of the above
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19.
The maximum desirable limit (BIS of mercury in the drinking water is
0.05 mg/l
0.9 mg/l
0.1 mg/l
0.001 mg/l
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20.
Conventional tertiary treatment is
chemical coagulation and flocculation
filtration
sedimentation
none of these
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