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Biochemical Engineering
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Sterilization
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Question
The specific death rate of an organism can be expressed as
Options
A. ln 2/
D
B.
D
/ln2
C.
D
.ln2
D. 2.0.3/ln2
Correct Answer
ln 2/
D
More questions
1. In a bioreactor, if at a particular time the oxygen transfer rate is 23 kg.h
-1
, then the oxygen uptake will be
Options
A. 23 kg.h
-1
B. less than 23 kg.h
-1
C. greater than 23 kg.h
-1
D. 2.3 kg.h
-1
Show Answer
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Discuss
Correct Answer: 23 kg.h
-1
2. Temporary hardness of water is caused by the presence of
Options
A. chlorides of calcium and magnesium
B. sulfates of calcium and magnesium
C. bicarbonates of calcium and magnesium
D. carbonates of sodium and potassium
Show Answer
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Correct Answer: bicarbonates of calcium and magnesium
3. The lowest yield of ATP /is in
Options
A. fermentation
B. aerobic respiration
C. anaerobic respiration
D. same in (a), (b) and (c)
Show Answer
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Correct Answer: fermentation
4. Micro filtration refers to the separation of suspended material such as bacteria by using a membrane with spore sizes of
Options
A. 0.02 to 10?m
B. 1-10A°
C. 20-30?m
D. 10-200A°
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Correct Answer: 0.02 to 10?m
5. The disk centrifuge is the type of centrifuge used most often for bio separations due to its
Options
A. continuous operation
B. lesser cost
C. higher speed
D. ease in operation
Show Answer
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Correct Answer: lesser cost
6. A thixotropic fluid is one in which the viscosity
Options
A. is constant regardless of the stirrer speed or mixing time
B. changes during mixing but returns to its original state after mixing
C. increases with mixing time
D. decreases with mixing time
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Correct Answer: decreases with mixing time
7. The effect of increasing the stirrer speed in an unbaffled stirred tank reactor is that
Options
A. a small increase in stirrer speed will cause the liquid to enter the turbulent flow regime
B. as the stirrer speed increases, the liquid will continue to circulate and then become turbulent
C. as the stirrer speed increases, the liquid will continue to circulate. Eventually a vortex will form.
D. A vortex will form at low stirrer speeds. As the stirrer speed increases the liquid will start to circulate
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Correct Answer: as the stirrer speed increases, the liquid will continue to circulate. Eventually a vortex will form.
8. In wastewater treatment, which bioreactor is generally used?
Options
A. Plug flow reactor
B. Trickle bed reactor
C. Tower fermentor
D. CSTR
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Correct Answer: Trickle bed reactor
9. Which of the following would be best described as an axial flow impeller?
Options
A. An impeller with blades pitched at 45° to the vertical
B. An impeller which directs liquid flow towards the base of the reactor
C. Both (a) and (b)
D. An impeller with blades pitched at 75° to the vertical
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Correct Answer: Both (a) and (b)
10. 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
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Correct Answer: a vertical pitch welded to a horizontal disk
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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