Online Biochemical Engineering Test - Biochemical Engineering Test - Random

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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 of the following statement(s) regarding enzymes, is/are false?

Enzymes are always proteins that function as catalysts

Enzymes provide activation energy for reactions

Enzyme activity can be regulated

Enzymes may be used many times for a specific reaction

[#]

During the enzymatic reaction of an immobilized enzyme, the rate of substrate transfer is

equal to that of substrate consumption

more than that of substrate consumption

lesser than that of substrate consumption

is nothing to do with the substrate consumption

[#]

For glucose isomerization by immobilized enzyme, the reactor generally used is

CSTR

plug flow

packed bed

fluidized bed

[#]

Trichoderma β-glucanase is reported

to stabilize mashing

to convert taste fractions of dextrins to fermentable sugars in beer

to convert starch to dextrin

all of the above

[#]

Discoloration can be achieved by using

sulphloydryl oxidase

proteases

anthocyanase

all of these

[#]

A fed-batch reactor containing 1 g.l^-1 of substrate in 2 litre of medium. It is fed with 1 g.l^-l of substrate at the rate of 1 litre per hour. After 10 hours, the concentration of substrate in the reactor was 0.5 g.l^-1 . The mass of substrate that was used by the culture in the reactor was

12g

[#]

A culture system with constant environmental conditions maintained through continual provision of nutrient and removal of wastes is called __________ culture system.

continuous

batch

fed-batch

semi continuous

[#]

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

[#]

Which of the following best explains the reasons for using axial flow impellers in crystallization and precipitation reactions?

Crystal and precipitates are not too small, so as to ensure easy separation of the solids from the mother liquor

Crystals and precipitates are thoroughly broken down, so as to ensure easy separation of the solids from the mother liquor

Both (a) and (b)

Axial flow impellers provide low shear, energy efficient mixing conditions

[#]

10.

Radial flow impellers

provide high shear conditions for breaking up bubbles

direct flow towards the walls of the reactor

Both (a) and (b)

provide low shear conditions and are suited for use in shear sensitive procesess

[#]

11.

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

[#]

12.

If the viscosity of a fluid decreases with increasing stirrer speed, then the nature of the fluid is

newtonian

pseudoplastic

dilatant

thixotropic

[#]

13.

A Newtonian 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 increasing stirrer speed

decreases with increasing stirrer speed

[#]

14.

A liquid is flowing at 11,400 l.h^-1 along a pipeline having a diameter of 4 cm. If the liquid has a density of 1 g.ml^-1 and viscosity of 0.001kg.m^-1.s^-1, then the liquid would be in the

laminar phase

transient phase

turbulent phase

any of the phase

[#]

15.

A Brookfield viscometer cannot determine the shear stress because

the shear stress is not defined

a computer is required

the impeller type is given only by numbers

all of the above

[#]

16.

Which of the following describes the detrimental effect of bubbles on animal cells?

Cells trapped on the surface of bubbles can be damaged when the bubbles explode, releasing their pressure and surface energies

Cells trapped in the moving foam can be dragged apart by the bubbles

Both (a) and (b)

Bubbles can explode in the liquid medium causing the release of ultraviolet radiation

[#]

17.

Which of the operation does not come under upstream processing?

Media preparation

Inoculum development

Effluent treatment

Storage of raw material

[#]

18.

A typical tubular centrifuge has a bowl of 2 to 5 inch in diameter and 9 to 30 inch in height with a maximum rotating speed of

15,000 to 50,000 rpm

50,000 to 100,000 rpm

100,000 to 150,000 rpm

150,000 to 200,000 rpm

[#]

19.

Zeolite softening process removes

only temporary hardness of water

only permanent hardness of water

both temporary and permanent hardness of water

the dissolved gases in permanent hard water

[#]

20.

Temporary hardness of water is caused by the presence of

chlorides of calcium and magnesium

sulfates of calcium and magnesium

bicarbonates of calcium and magnesium

carbonates of sodium and potassium

[#]

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