Online Biochemical Engineering Test - Biochemical Engineering Test - Random

Instruction:

This is a FREE online test. Beware of scammers who ask for money to attend this test.
Total number of questions: 20.
Time allotted: 30 minutes.
Each question carries 1 mark; there are no negative marks.
DO NOT refresh the page.
All the best!

The reciprocal equation for non competitive inhibition can be arranged to the equation for the

Dixon plot

Woolf-Augusteinsson-Hofstee plot

Eadie-Scatchard plot

Hanes-Woolf plot

[#]

The usual method(s) to solve rate equation of simple enzyme kinetics is/are

Michaelis Menten approach

Briggs-Haldane approach

Numerical solution approach

all of these

[#]

The enzyme used to reduce bitterness of grapes commonly contains

α-L-rhamonosidase

β-d-glucosidase

β- galactosidase

both (a) and (b)

[#]

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

[#]

Unsteady state mass balance for dynamic model of continuous stirred tank reactor (CSTR) is

time rate of total amount in rector = rate of addition to reactor -rate of removal + rate of formation

total amount in rector = rate of addition to reactor - rate of removal + rate of formation

rate of total amount in rector = rate of addition to reactor - rate of removal + rate of formation

none of the above

[#]

Saccharomyces cerevisiae is being grown in a chemostat converts glucose to biomass, ethanol, glycerol and carbon dioxide. At steady state, the concentration of glucose, biomass, ethanol and glycerol will

decrease with time

increase with time

be constant

change randomly with time

[#]

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

[#]

A continuous reactor at steady state contains 0.04 g.l^-1 of biomass and 0.02 g.l^-1 of phenol. The feed contained 0.1 g.l^-1 of phenol. The biomass yield would be

0.4 g.g^-1

0.5 g.g^-1

1.0 g.g^-1

5.0 g.g^-1

[#]

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

[#]

10.

Wash out in steady state fermentation occurs when

dilution rate is less than maximum specific growth rate

dilution rate is higher than the maximum specific growth rate

cell concentration reaches the maximum

specific growth rate is maximum

[#]

11.

The diameter of the baffles in a standard stirred tank bioreactor ranges from

1/10^th - 1/12^th of the tank diameter

1/3^rd - 1/4^thof the tank diameter

1/15^th - 1/20^th of the tank diameter

1/20^th - 1/25^th of the tank diameter

[#]

12.

The oxygen absorption rate can be determined by

sodium sulfite oxidation method

dynamic gassing out technique

direct measurement

all of these

[#]

13.

In aerobic microorganisms cultures radial flow impellers are used because

they provide energy efficient high turbulent mixing conditions

they provide low shear mixing conditions

they provide high shear mixing conditions

they ensure that bubble size is maximized leading to high oxygen transfer rates

[#]

14.

Turbulent flow range of mixing speed is obtained for

Re_i<10

10<Re_i<10⁴

Re_i>10⁴

None of these

[#]

15.

The viscosity of liquid was classified as both dilatant and rheopectic, which means that the viscosity

increased with stirring speed but decreased with mixing time

increased with stirring speed and increased with mixing time

decreased with stirring speed but increased with mixing time

decreased with stirring speed and decreased with mixing time

[#]

16.

For laminar flow of Newtonian fluid through a smooth round pipe, the ratio of average fluid velocity to the maximum velocity is

0.5

0.75

0.87

0.37

[#]

17.

The moist heat is more effective than the dry heat because the intrinsic heat resistance of vegetative cells is greatly

increased in a dry state

decreased in a dry state

increased in a wet state

decreased in a wet state

[#]

18.

For the extractions operation, the selectivity should be

> 1

< 1

zero

[#]

19.

Hardness of water does not

have any bad effect in boiler

make cooking of foods difficult

make it unfit for drinking

cause difficulty in the washing of clothes with soaps

[#]

20.

Temporary hardness of water may be removed by adding

calcium hydroxide

calcium carbonate

calcium chloride

sodium bicarbonate

[#]

Quick links

Quantitative Aptitude

Verbal (English)

Reasoning

Programming

Interview

Placement Papers

Online Biochemical Engineering Test - Biochemical Engineering Test - Random

Marks : 2/20

Test Review : View answers and explanation for this test.

Current Affairs

Interview Questions

Group Discussions