CuriousTab
Search
CuriousTab
Home
Aptitude
Computer
C Programming
C# Programming
C++ Programming
Database
Java Programming
Networking
Engineering
Biochemical Engineering
Biochemistry
Biotechnology
Chemical Engineering
Civil Engineering
Computer Science
Digital Electronics
Electrical Engineering
Electronics
Electronics and Communication Engineering
Mechanical Engineering
Microbiology
Technical Drawing
GK
Current Affairs
General Knowledge
Reasoning
Data Interpretation
Logical Reasoning
Non Verbal Reasoning
Verbal Ability
Verbal Reasoning
Exams
AIEEE
Bank Exams
CAT
GATE
IIT JEE
TOEFL
Jobs
Analyst
Bank PO
Database Administrator
IT Trainer
Network Engineer
Project Manager
Software Architect
Discussion
Home
‣
Biochemical Engineering
‣
Agitation and Aeration
Comments
Question
Power consumption by agitation is
Options
A. a function of physical properties
B. a function of operating conditions
C. a function of vessel and impeller geometry
D. all of the above
Correct Answer
all of the above
Agitation and Aeration problems
Search Results
1. Power number is ratio of
Options
A. imposed forced to intertial force
B. bouyant force to inertial force
C. gravitation force to inertial force
D. imposed force to gravitational force
Show Answer
Scratch Pad
Discuss
Correct Answer: imposed forced to intertial force
2. What is the ratio of depth of liquid in vessel to the diameter of tank (
H:D
t
)?
Options
A. 1 : 1
B. 2 : 1
C. 4 : 1
D. none of these
Show Answer
Scratch Pad
Discuss
Correct Answer: 1 : 1
3. Which of the following best explains the reasons for using axial flow impellers in crystallization and precipitation reactions?
Options
A. Crystal and precipitates are not too small, so as to ensure easy separation of the solids from the mother liquor
B. Crystals and precipitates are thoroughly broken down, so as to ensure easy separation of the solids from the mother liquor
C. Both (a) and (b)
D. Axial flow impellers provide low shear, energy efficient mixing conditions
Show Answer
Scratch Pad
Discuss
Correct Answer: Crystal and precipitates are not too small, so as to ensure easy separation of the solids from the mother liquor
4. The average concentration of oxygen in the boundary layers surrounding the bubbles (
C
o
*
) in a reactor is normally determined by
Options
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
Show Answer
Scratch Pad
Discuss
Correct Answer: measuring the steady state concentration of oxygen in the bulk liquid prior to inoculation of the reactor
5. Which of the following impellers will provide radial flow?
Options
A. Paddles
B. Flat blade turbines
C. Disk flat blade turbines
D. All of the above
Show Answer
Scratch Pad
Discuss
Correct Answer: All of the above
6. The reason of using a flat disk in a Turbine is
Options
A. to create high shear conditions
B. to break up bubbles more efficiently than the impeller blades
C. to ensure that the bulk of the energy consumption occurs at the blades
D. all of the above
Show Answer
Scratch Pad
Discuss
Correct Answer: to ensure that the bulk of the energy consumption occurs at the blades
7. Why vortexing is undesirable in the agitation of biological systems?
Options
A. The collision between the cells, impeller and air bubbles will lead to cell damage
B. Poor mixing despite the use of high stirrer speeds
C. Mixing will not be in the turbulent region
D. All of the above
Show Answer
Scratch Pad
Discuss
Correct Answer: All of the above
8. The range of width for the baffle in the fermenter is __________ times of vessel diameter
Options
A. 1/10 to 1/12
B. 1/8 to 1/10
C. 1/5 to 1/8
D. none of these
Show Answer
Scratch Pad
Discuss
Correct Answer: 1/10 to 1/12
9. Which of the following(s) is/are non-mechanically agitated reactors?
Options
A. Stirrer tank reactor
B. Bubble column
C. Air lift reactor
D. Both (b) and (c)
Show Answer
Scratch Pad
Discuss
Correct Answer: Both (b) and (c)
10. An aerated bioreactor will increase oxygen transfer rates with the addition of detergents because it
Options
A. enhances bubble coalescence
B. causes bubbles to expand
C. discourages bubble coalescence
D. increases the surface tension of the liquid
Show Answer
Scratch Pad
Discuss
Correct Answer: discourages bubble coalescence
Comments
There are no comments.
Enter a new Comment
Save
More in Biochemical Engineering:
Agitation and Aeration
Downstream Processing
Enzymes and Application
Enzymes and Kinetics
Fermentation Kinetics
Fermentation Reactors
Fluid Flow
Immobilized Enzyme
Sterilization
Water Treatment