Online Biochemical Engineering Test - Biochemical Engineering Test 10

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Total number of questions: 20.
Time allotted: 30 minutes.
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If a reaction occurs in the absence of inhibitor with rate ν₀ and in the presence of inhibitor with rate ν_i, the degree of inhibition is defined as

(ν₀ - ν_i)/ν₀

(ν₀ + ν_i)/ν₀

(ν₀ν_i)/ν₀

(ν₀-ν_i)/ν_i

[#]

Various techniques are available for determining the effective diffusivity of solute in gel. Thin disk method uses

a diffusion cell with two compartments divided by a thin gel

a diffusion cell with two compartments

a diffusion cell with two compartments plus by a thin gel

a diffusion cell with two compartments multiply by a thin gel

[#]

The enzyme β-galactosidase is also known as

lactase

EC3.2.1.23

both (a) and (b)

isomerase

[#]

The main reason for production of antibiotics in fed batch reactors is

the presence of precursors is often toxic to the cells

higher yields when cells enter the stationary phase

higher yields when cell growth slows

all of the above

[#]

Which of the following is used to calculate mass of substrate in the reactor?

Flow rate x substrate concentration in the reactor

Volume of reactor x substrate concentration in reactor

Flow rate x mass of reactor

Volume of reactor x Flow rate

[#]

The fastest route of NADH reoxidation is

aerobic respiration

anaerobic respiration

fermentation

decomposition

[#]

Which of the following organisms will continue their metabolism at high substrate concentrations?

Pseudomonas aeruginosa

Saccharomyces cerevisiae

Bacillus subtilis

Escherichia coli

[#]

During the exponential phase the maximum specific growth rate equals specific growth rate as

concentration of the growth limiting substrate is much less than the monod constant

concentration of growth limiting substrate is much greater than the monod constant

specific growth rate increases exponentially

concentration of the growth limiting substrate is equal to the monod constant

[#]

The region of an airlift bioreactor in which the liquid travels in a downward direction is called the

downcomer

disengagement zone

air riser

flotsam

[#]

10.

The function of the disengagement zone in an airlift fermenter is to

prevent CO₂ rich bubbles from entering the downcomer

reduce the velocity of the bubbles

reduce liquid loss as aerosols

all of the above

[#]

11.

An open system in which the growth rate is maintained by adding a nutrient (present in limiting quantities) at the same rate as that medium containing micro-organisms is removed is called

manostat

chemostat

turbidostat

culturostat

[#]

12.

The specific growth rate is affected by

sabstrate concentration

product concentration

oxygen supply

all of these

[#]

13.

In a batch reactor specific growth rate

remains constant throughout the process

increases exponentially

changes during the fermentation

is highest during the stationary phase

[#]

14.

To describe components of an airlift bioreactor which of the follow-ings are generally included?

Disengagement zone, air riser, downcomer

Flotsam, jetsam, downzone

Air comer, disentanglement zone, downsizer

All of the above

[#]

15.

A fermentation system has a K_La of 3 s^-1 and a C₀^* of 5 ppm of O₂. If the bulk liquid is saturated with oxygen then the oxygen transfer rate will be equal to

zero

3 mg.l^-1.s^-1

5 mg.l^-1.s^-1

15 mg.l^-1.s^-1

[#]

16.

Higher temperatures affect oxygen transfer rates by

increasing K_La but lowering C^*_o

lowering K_La but increasing C^*_o

increasing K_La and increasing C_o

lowering K_La and lowering C_o

[#]

17.

A rheopectic 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 mixing time

decreases with mixing time

[#]

18.

The efficiency of fibrous filter by combined mechanism is given by(where η_imp,η_int,η_dif are the efficiencies by impaction, interception and diffusion respectively)

1 - η_impη_intη_dif

1 - (1 - η_imp)(1 - η_int)( 1 - η_dif)

1 - ( η_impη_int/η_dif)

None of the above

[#]

19.

The maximum desirable limit (BIS of mercury in the drinking water is

0.05 mg/l

0.9 mg/l

0.1 mg/l

0.001 mg/l

[#]

20.

Conventional tertiary treatment is

chemical coagulation and flocculation

filtration

sedimentation

none of these

[#]

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Online Biochemical Engineering Test - Biochemical Engineering Test 10

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