IndiaBIX

Biochemical Engineering - Agitation and Aeration

Exercise : Agitation and Aeration - Section 2
36.
During aeration, a cylindrical reactor had a height of 10 m. Without aeration, the height was 7.5 m. Under these aeration and mixing conditions, the gas hold up in the reactor is
100%
75%
50%
25%
Answer: Option
Explanation:
No answer description is available. Let's discuss.
37.
A fermentation system has a KLa 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
Answer: Option
Explanation:
No answer description is available. Let's discuss.
38.
Which of the following would be best described as a radial flow impeller?
An impeller with blades pitched at 45° to the vertical
A Rushton turbine
Both (a) and (b)
An impeller which directs liquid flow towards the base of the reactor
Answer: Option
Explanation:
No answer description is available. Let's discuss.
39.
Small propellers turn at the speed of either
20 or 150 rpm
150 or 300 rpm
400 or 800 rpm
1150 rpm or 1750 rpm
Answer: Option
Explanation:
No answer description is available. Let's discuss.
40.
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
Answer: Option
Explanation:
No answer description is available. Let's discuss.
Quick links
Quantitative Aptitude
Verbal (English)
Reasoning
Programming
Interview
Placement Papers