Online Biochemical Engineering Test - Biochemical Engineering Test 3

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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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Enzymes are basically

proteins

vitamins

fat

carbohydrates

[#]

The immobilization technique involving physical method is

covalent bond formation dependent

non-covalent bond formation dependent

both (a) and (b)

ionic bond formation dependent

[#]

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

[#]

A continuous reactor has a dilution rate of 0.5 h^-1. Its residence time would be

ln(2)/0.5

ln(2) x 0.5

0.5 h

2 h

[#]

Which of the following would be correct concerning the concentration of biomass (X). growth limiting substrate (S) and product (P) in a chemostat when the cells have been washed out?

X,S and P will be zero

X,S and P can not be predicted for the above condition

X and P will be zero while S is equal to the substrate concentration in feed

None of the above

[#]

In the stationary phase

growth is proportional to death

growth rate is equal to death rate

growth rate is lesser than death rate

no co-relation exist between death rate and growth rate

[#]

The relatively large volume (10 to 40% of total fermenter volume) of the seed culture is employed to

increase the overall fermentation time

increase the overall yield of biomass

decrease the overall fermentation time

decrease the overall yield of product

[#]

The air riser is located on the outside of the draft tube for the large-scale airlift bioreactors because of

higher oxygen transfer rates

a small sparge ring

better heat transfer efficiencies

all of these

[#]

The contents in bubble column and air lift reactor are mixed through

compressed air

a mechanical internal moving part

external pumping

any of these

[#]

10.

Tower fermentors are used for

continuous penicillin production

continuous beer production

production of enzymes

batch production of beer

[#]

11.

If liquid density and viscosity remains constant, then the Reynolds number in a stirred tank reactor will vary with the

impeller diameter

square root of the impeller diameter

square of the impeller diameter

cube of the impeller diameter

[#]

12.

During fermentation, the saturation concentration of oxygen was reduced from 7 ppm. to 1 ppm. Which one of the following conclusions can be drawn?

Microbial growth is oxygen limited since the oxygen concentration is lesser than the saturation concentration

Microbial growth is not oxygen limited since the oxygen concentration is lesser than the saturation concentration

Experimental error leads to the reduction

No conclusion can be drawn

[#]

13.

The best described action of Pluronic F68 (non-ionic detergent) in a cell culture medium is that, it

acts on the surface properties of the cells and the culture medium

provides nutrients for the cells

acts as a flocculant

acts as a coagulant

[#]

14.

The SI unit for viscosity is

kg.m^-1.s^-1

kg.m^-2.s^-2

kg.m^-3.s^-1

kg.m^-1.s^-2

[#]

15.

The viscosity of water at STP is approximately

0.005 kg.m^-1.s^-1

0.001 kg.m^-1.s^-1

0.003 kg.m^-2.s^-1

0.1 g.cm^-1.s^-1

[#]

16.

The viscosity of the culture fluid is classified as both pseudoplastic and thixotropic which indicates that the viscosity

increases with stirring speed but decreases with mixing time

increases with stirring speed and increases with mixing time

decreases with stirring speed but increases with mixing time

decreases with stirring speed and decreases with mixing time

[#]

17.

The mechanism of air filtration in fibrous filter is

electrostatic attraction

impaction

interception

all of these

[#]

18.

The correlation often employed to correlate adsorption data for protein is (where Y_max is the maximum amount of solute adsorbed per mass of adsorbent, X is the mass fraction of solute in the diluent phase in solute-free basis, K_L is a constant and Y is the equilibrium value of the mass of solute adsorbed per mass of adsorbent)

Y = Y_maxX/(K_L+X)

Y = Y_max/(K_L+X)

Y = Y_maxX/K_L

Y = Y_max- X/ (K_L+X)

[#]

19.

Zeolite used in zeolite softening process for the treatment of hard water gets exhausted after certain time of usage but can be regenerated by flushing it with

10% calcium chloride solution

10% magnesium sulfate solution

10% magnesium chloride solution

10% sodium chloride solution

[#]

20.

Application of quaternary ammonium compounds as sanitizing agents tends to

favor gram positive bacteria

decrease gram positive bacteria

increase the percentage of gram(-)ve rods on utensils

none of the above

[#]

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Online Biochemical Engineering Test - Biochemical Engineering Test 3

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