Online Biochemical Engineering Test - Biochemical Engineering Test 5

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 category of enzymes belongs to class two in the international classification?
Hydrolases
Ligases
Transferases
Isomerase
Your Answer: Option
(Not Answered)
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2.
Which of the following common drugs is not a specific enzyme inhibitor?
Iodine
Methotrexate
Sulfbnilamide
Penicillin
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(Not Answered)
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3.
Soya off flavour removal may be achieved using
di acetyl reductase
β- amylase
aldehyde oxidase
protease
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(Not Answered)
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4.
Which of the enzyme combination is commercially used for the removal of oxygen?
Glucose oxidase-cellulase
Glucose oxidase-catalase
Glucose oxidase-lactase
All of these
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(Not Answered)
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5.
Saccharomyces cerevisiae produces high biomass yields at low glucose concentrations and high dissolved oxygen concentrations. Which of the following should be followed for maximizing its biomass productivity?
Batch fermenter with a high initial glucose concentration
Continuous fermenter with a low initial glucose concentration
Fed batch fermenter
All of the above
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6.
The cellular productivity in a continuous stirred tank fermenter (CSTF) increases with an increase in the dilution rate and reaches a maximum value. If the dilution rate is increased beyond the maximum point, the productivity will
decrease abruptly
increase
increase drastically
be zero
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7.
Pseudo-steady state in a continuous reactor refers to a reactor in which
Pseudomonads are being cultured
concentration oscillate around a mean value
concentration increase with time
concentration decrease with time
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8.
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
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(Not Answered)
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9.
Residence time distribution (RTD) of a reactor is independent of
micro mixing
volume of reactor
height of the reactor
width of the reactor
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10.
In the design of a paddle agitator, the ratio of paddle diameter to tank diameter is normally taken as
0.1
0.8
0.25
0.5
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11.
Which of the following stirrer requires least amount of energy for same yield?
Mig
Intermig
Turbine
Disc
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12.
A cylindrical reactor has a liquid volume of 100,000 litres. It has an aspect ratio the ratio of the channel height to width of 1:1. The height of the liquid in the reactor will be approximately:
1.0 m
3.0 m
5.0 m
7.0 m
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13.
The dynamic technique is based on the
oxygen material balance in an aerated batch fermenter during the growth of microorganisms
change of the oxygen concentration
oxidation of the sodium sulfite to sodium sulfate
oxygen material balance in a fermenter
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14.
The effect of increasing the stirrer speed in an unbaffled stirred tank reactor is that
a small increase in stirrer speed will cause the liquid to enter the turbulent flow regime
as the stirrer speed increases, the liquid will continue to circulate and then become turbulent
as the stirrer speed increases, the liquid will continue to circulate. Eventually a vortex will form.
A vortex will form at low stirrer speeds. As the stirrer speed increases the liquid will start to circulate
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15.
Which of the following is correct?
The viscosity of liquids and gases decrease with increasing temperature
The viscosity of liquids and gases increase with increasing temperature
the viscosity of gases increases with increasing temperature, but decreases in liquids
the viscosity of gases decreases with increasing temperature, but decreases in liquids.
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16.
Sterilization can be carried out by
heat
radiation
chemical agents
all of these
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17.
The collection efficiency by the inertial impaction mechanism is the function of
Stokes and Reynolds number
Stokes and Schmidt number
Grashoff and Reynolds number
Stokes and Grashof number
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18.
The interception efficiency can be expressed as (where dp is the particle diameter and Dc cylindrical collection diameter)
dp/Dc
dp x Dc
dp/Dc x 100
dpDc/100
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19.
The deviation from ideal plug flow due to axial mixing can be described by the
dispersion model
Langmuir model
Friedlander model
Pasceri model
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20.
In antibiotic manufacturing processes, the fermentation time ranges from
2-3 weeks
1-2 weeks
4-5 weeks
2-4 weeks
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