Online Biochemical Engineering Test - Biochemical Engineering Test 5

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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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Which category of enzymes belongs to class two in the international classification?

Hydrolases

Ligases

Transferases

Isomerase

[#]

Which of the following common drugs is not a specific enzyme inhibitor?

Iodine

Methotrexate

Sulfbnilamide

Penicillin

[#]

Soya off flavour removal may be achieved using

di acetyl reductase

β- amylase

aldehyde oxidase

protease

[#]

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

[#]

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

[#]

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

[#]

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

[#]

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

[#]

Residence time distribution (RTD) of a reactor is independent of

micro mixing

volume of reactor

height of the reactor

width of the reactor

[#]

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

[#]

11.

Which of the following stirrer requires least amount of energy for same yield?

Mig

Intermig

Turbine

Disc

[#]

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

[#]

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

[#]

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

[#]

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.

[#]

16.

Sterilization can be carried out by

heat

radiation

chemical agents

all of these

[#]

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

[#]

18.

The interception efficiency can be expressed as (where d_p is the particle diameter and D_c cylindrical collection diameter)

d_p/D_c

d_p x D_c

d_p/D_c x 100

d_pD_c/100

[#]

19.

The deviation from ideal plug flow due to axial mixing can be described by the

dispersion model

Langmuir model

Friedlander model

Pasceri model

[#]

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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Online Biochemical Engineering Test - Biochemical Engineering Test 5

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