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
The power consumption in a stirring vessel can be assessed by using a
Options
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
Agitation and Aeration problems
Search Results
1. Turbine impeller consists of flat impeller blades with
Options
A. a vertical pitch welded directly to the shaft
B. a angled pitch welded directly to the shaft
C. a vertical pitch welded to a horizontal disk
D. a angled pitch welded to a horizontal disk
Show Answer
Scratch Pad
Discuss
Correct Answer: a vertical pitch welded to a horizontal disk
2. A flooded impeller will lead to poor oxygen transfer rates because
Options
A. bubbles tend to coalesce under the impeller
B. bubbles tend to break down too rapidly under high shear conditions
C. bubbles tend to move too quickly through the bulk liquid
D. the cells clog up the surface of the bubble
Show Answer
Scratch Pad
Discuss
Correct Answer: bubbles tend to coalesce under the impeller
3. Transient flow range of mixing speed is obtained for
Options
A.
Re
i
<10
B. 10<
Re
i
<10
4
C.
Re
i
>10
4
D. None of these
Show Answer
Scratch Pad
Discuss
Correct Answer: 10<
Re
i
<10
4
4. Henry's law relates
Options
A. the partial pressure of oxygen and the saturation concentration of oxygen in the liquid
B. the oxygen transfer rate and the bubble size
C. the oxygen transfer rate and the temperature
D. the oxygen transfer rate to the partial pressure of oxygen in the liquid
Show Answer
Scratch Pad
Discuss
Correct Answer: the partial pressure of oxygen and the saturation concentration of oxygen in the liquid
5. Which of the following is not considered among the three best-known theories of interphase mass transfer?
Options
A. two-film theory
B. penetration theory
C. surface renewal theory
D. Calderbank and Moo-Young theory
Show Answer
Scratch Pad
Discuss
Correct Answer: Calderbank and Moo-Young theory
6. The rate limiting step in the movement of oxygen from the gas phase in a bubble to the cell is the movement of oxygen molecules through
Options
A. gas-liquid interface
B. bubble boundary layer
C. bulk liquid
D. gas phase
Show Answer
Scratch Pad
Discuss
Correct Answer: bubble boundary layer
7. Swirling and vortex formation can be prevented by
Options
A. using baffles
B. using diffusion ring with turbines
C. both (a) and (b)
D. none of these
Show Answer
Scratch Pad
Discuss
Correct Answer: both (a) and (b)
8. Gas hold up, characterizing the hydrodynamics in a fermenter, mainly depends on the
Options
A. superficial gas velocity
B. power consumption
C. Both (a) and (b)
D. gas concentration
Show Answer
Scratch Pad
Discuss
Correct Answer: Both (a) and (b)
9. When liquid is pumped through cooling coil in a stirred tank reactor to cool. Which of the following is not correct?
Options
A. If the stirrer speed is increased, the rate will be faster
B. Baffles in the tank will increase the rate of cooling
C. Faster cooling rates at a slower rate of pumping
D. Faster cooling rates at a faster rate of pumping
Show Answer
Scratch Pad
Discuss
Correct Answer: Faster cooling rates at a slower rate of pumping
10. If liquid density and viscosity remains constant, then the Reynolds number in a stirred tank reactor will vary with the
Options
A. impeller diameter
B. square root of the impeller diameter
C. square of the impeller diameter
D. cube of the impeller diameter
Show Answer
Scratch Pad
Discuss
Correct Answer: square of the impeller diameter
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