Online Biochemical Engineering Test - Biochemical Engineering Test - Random

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Total number of questions: 20.
Time allotted: 30 minutes.
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A noncompetitive inhibitor of an enzyme-catalyzed reaction

increases K_M and increases V_max

increases K_M and reduces V_max

reduces K_M and increases V_max

reduces K_M and reduces V_max

[#]

When an enzyme is functioning at V_max, the rate of the reaction is limited by

the number of collisions between enzyme and substrate

the number of substrate molecules in the reaction

the concentration of the substrate

the rate at which the enzyme can convert substrate to product

[#]

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

[#]

Lysozyme is naturally present in

egg white

bacteria

tears & milk

all of these

[#]

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

[#]

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

[#]

Yield coefficient represents

total biomass or product produced

conversion efficiency of a substrate into product

conversion rate of a substrate into biomass or product

production time of biomass or product

[#]

In fed-batch fermentation, mass of substrate utilized is calculated using the relationship

initial mass of substrate in the reactor + final mass of substrate in the reactor + flow rate x [substrate in the feed]

initial mass of substrate in the reactor - final mass of substrate in the reactor + flow rate x [substrate in the feed]

initial mass of substrate in the reactor + final mass of substrate in the reactor - flow rate x [substrate in the feed]

initial mass of substrate in the reactor + final mass of substrate in the reactor - flow rate

[#]

If the specific growth rate, μ. is constant with time during the exponential growth period, the equation correlating bacterial number density C_n), cell number concentration with respect to time can be expressed as

C_n= C_n₀ exp[μ (t - t₀)]

C_n₀ = C_n exp[μ (t - t₀)]

C_n/C_n₀ =(1/μ)exp(t-t₀)

C_n₀ / C_n = (1/μ)exp(t-t₀)

[#]

10.

Penetration theory assumes that turbulent eddies travel from the bulk of the phase to the interface where they remain constant for a constant exposure time (t_e). The model correlating K_L, mass transfer coefficient and D_AB, diffusivity can be expressed as

K_L = 2(D_AB/πt_e)^0.25

K_L = 2(D_AB/πt_e)^0.5

K_L = 2(D_AB/πt_e)^0.75

K_L = 2(D_AB/πt_e)

[#]

11.

Which of the following(s) is/are non-mechanically agitated reactors?

Stirrer tank reactor

Bubble column

Air lift reactor

Both (b) and (c)

[#]

12.

Which of the following is not considered among the three best-known theories of interphase mass transfer?

two-film theory

penetration theory

surface renewal theory

Calderbank and Moo-Young theory

[#]

13.

Axial flow impellers

provide high shear conditions for breaking up bubbles

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

provide direct flow towards the walls of the reactor

none of the above

[#]

14.

In a tall reactor, oxygen transfer rates will be

highest at the surface of the reactor

highest at the base of the reactor

highest in the middle of the reactor

the same throughout the reactor

[#]

15.

Non-linear relationship between shear stress and shear rate exists in

newtonian fluids

non-newtonian fluids

both (a) and (b)

none of these

[#]

16.

Model proposed by the Friedlander, correlating the air filtration efficiency by impaction can be expressed as (where N_St is the Stokes number)

η_imp = 0.075N_St^1.2

η_imp= 0.75N_St^1.2

η_imp = 0.25N_St^1.2

η_imp = 0.025N_St^1.2

[#]

17.

Analogus to the molecular diffusion, the x-directional flux of microorganisms suspended in a medium due to the axial mixing can be represented as (where J_n is flux component 'n', c_n is concentration of'n')

J_n = -dc_n/dx

J_n = dc_n/dx

J_n = -D dc_n/dx

J_n = D dc_n/dx

[#]

18.

Concentration polarization can be reduced further by

pre filtering the solution

reducing the flow rate per unit membrane surface area

back washing periodically

all of the above

[#]

19.

The maximum desirable limit Bureau of Indian Standards (BIS) of lead in the drinking water is

0.05 mg/l

0.09 mg/l

0.1 mg/l

1.0 mg/l

[#]

20.

Both temporary and permanent hardness of water can be removed by

boiling

distillation

filtration

decantation

[#]

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