Online Biochemical Engineering Test - Biochemical Engineering Test - Random

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.
Which of the following activity is possible by transferases?
Transfer of methyl groups
Transfer of glycosyl group
Both (a) and (b)
None of these
Your Answer: Option
(Not Answered)
Correct Answer: Option

2.
The effect of non-competitive inhibition on a Lineweaver-Burk Plot is that
it can move the entire curve to the right
it can change the y-intercept
it can change the x-intercept
all of these
Your Answer: Option
(Not Answered)
Correct Answer: Option

3.
Liquefaction of starch to dextrin is carried out by
α-amylase
cellulase
pectinase
all of these
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(Not Answered)
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4.
Which of the following metallic ion is there in ascorbic acid oxidase?
Mg
Fe
Cu
Mn
Your Answer: Option
(Not Answered)
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5.
Mixing profiles closest to plug flow are observed in
continuous packed bed reactor
stirred tank reactor with biomass recycles
continuous fluidized bed bioreactor
all of these
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(Not Answered)
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6.
The continuous cultures are not widely used in industry because
they are not suited for the production of secondary metabolites
contamination or mutation can have a disastrous effect on the operation
the government will not approve the licensing of pharmaceuticals produced in continuous cultures
all of the above
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(Not Answered)
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7.
In an activated sludge process, the biomass is recycled to
increase the efficiency of the process
reduce sludge volumes
increase the concentration of cells
all of the above
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(Not Answered)
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8.
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
Your Answer: Option
(Not Answered)
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9.
During the lag phase
cells just start growing
cells synthesize new proteins and membrane components
cells produce antibiotics to kill competing organisms
cells simply grow slowly
Your Answer: Option
(Not Answered)
Correct Answer: Option

10.
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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(Not Answered)
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11.
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
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(Not Answered)
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12.
The bubble column fermenter is usually limited to
aerobic fermentations
anaerobic fermentations
Both (a) and (b)
facultative fermentation
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(Not Answered)
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13.
Which of the following would be best described as an axial flow impeller?
An impeller with blades pitched at 45° to the vertical
An impeller which directs liquid flow towards the base of the reactor
Both (a) and (b)
An impeller with blades pitched at 75° to the vertical
Your Answer: Option
(Not Answered)
Correct Answer: Option

14.
In aerobic microorganisms cultures radial flow impellers are used because
they provide energy efficient high turbulent mixing conditions
they provide low shear mixing conditions
they provide high shear mixing conditions
they ensure that bubble size is maximized leading to high oxygen transfer rates
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(Not Answered)
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15.
A higher liquid height will lead to a higher gas hold up by which the oxygen transfer rate will be
higher throughout the reactor
lower throughout the reactor
higher at the base of the reactor
lower at the base of the reactor
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(Not Answered)
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16.
Which of the following compound, if added to a solution will lead to the greatest increase in viscosity?
A globular protein
Glucose
A long chain protein such as albumin
Water
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(Not Answered)
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17.
If the viscosity of a fluid decreases with the length of time that it is being mixed, then this fluid is
newtonian
rheopectic
viscoelastic
thixotropic
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(Not Answered)
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18.
Which of the operation does not come under upstream processing?
Media preparation
Inoculum development
Effluent treatment
Storage of raw material
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(Not Answered)
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19.
Maintenance cost varies from
0-4% of the capital cost
12-16% of the capital cost
4-8% of the capital cost
8-12% of the capital cost
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(Not Answered)
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20.
The optimum wet solid content for the cell suspension for a bead mill is typically somewhere between
5-15% by volume
15-30% by volume
30-60% by volume
60-90% by volume
Your Answer: Option
(Not Answered)
Correct Answer: Option

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