200 Best MCQs on Agitation and aeration- biochemical engineering

Top 200 MCQs on agitation and aeration

This section contains MCQs/ Objective Type Questions of agitation and aeration – biochemical engineering for various competetive Exams like HPPSC HPSSC HPSSSB and other exams

Q1). Swirling and vortex formation can be prevented by

a).using baffles
b).using diffusion ring with turbines
c).both (a) and (b)
d).none of these

Correct Answer:
both (a) and (b)
Explaination:


Q2). The power consumption in a stirring vessel can be assessed by using a

a).dynamometer
b).strain gauge attached to agitator shaft
c).watt meter attached to agitator motor
d).all of these

Correct Answer:
all of these
Explaination:


Q3). Surface renewal theory predicts that the mass transfer coefficient is

a).directly proportional to the square root of the molecular diffusivity
b).inversely proportional to the square root of the molecular diffusivity
c).directly proportional to the cube root of the molecular diffusivity
d).indirectly proportional to the cube root of the molecular diffusivity

Correct Answer:
directly proportional to the square root of the molecular diffusivity
Explaination:


Q4). The oxygen transfer rate in a bioreactor will increase if

a).oil is added
b).antifoam is added
c).detergent like molecules are added
d).increase in the reactor temperature

Correct Answer:
detergent like molecules are added
Explaination:


Q5). Which of the following impellers are used for wide range of viscosities?

a).paddles
b).turbines
c).propellers
d).none of these

Correct Answer:
turbines
Explaination:


Q6). Which of the following type(s) of stirrer can be used for microbiological processes?

a).Mig
b).Intermig
c).Turbine
d).All of these

Correct Answer:
All of these
Explaination:


Q7). The range of width for the baffle in the fermenter is __________ times of vessel diameter

a).1/10 to 1/12
b).1/8 to 1/10
c).1/5 to 1/8
d).none of these

Correct Answer:
1/10 to 1/12
Explaination:


Q8). The average concentration of oxygen in the boundary layers surrounding the bubbles (Co*) in a reactor is normally determined by

a).ultra-small dissolved oxygen probes
b).laser based photographic systems
c).measuring the steady state concentration of oxygen in the bulk liquid prior to inoculation of the reactor
d).measuring the steady state concentration of oxygen in the bulk liquid after inoculation of the reactor

Correct Answer:
measuring the steady state concentration of oxygen in the bulk liquid prior to inoculation of the reactor
Explaination:


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