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Biochemical Engineering
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Fluid Flow
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Question
A fluid in which the viscosity decreases with increasing stirrer speed and mixing time, can be represented as
Options
A. newtonian fluid
B. pseudoplastic, thixotropic fluid
C. dilatant, rheopectic fluid
D. dilatant, pseudoplastic fluid
Correct Answer
pseudoplastic, thixotropic fluid
More questions
1. In the death phase
Options
A. nutrients available for the cells are depleted and begin to die
B. the number of viable cells will increase
C. nutrients available for cells are replenished and start to multiply
D. none of the above
Show Answer
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Correct Answer: nutrients available for the cells are depleted and begin to die
2. Which of the following is correct?
Options
A. The viscosity of liquids and gases decrease with increasing temperature
B. The viscosity of liquids and gases increase with increasing temperature
C. the viscosity of gases increases with increasing temperature, but decreases in liquids
D. the viscosity of gases decreases with increasing temperature, but decreases in liquids.
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Correct Answer: the viscosity of gases increases with increasing temperature, but decreases in liquids
3. Soya off flavour removal may be achieved using
Options
A. di acetyl reductase
B. ?- amylase
C. aldehyde oxidase
D. protease
Show Answer
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Correct Answer: aldehyde oxidase
4. Temporary hardness of water may be removed by adding
Options
A. calcium hydroxide
B. calcium carbonate
C. calcium chloride
D. sodium bicarbonate
Show Answer
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Correct Answer: calcium hydroxide
5. Liquefaction of starch to dextrin is carried out by
Options
A. ?-amylase
B. cellulase
C. pectinase
D. all of these
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Correct Answer: ?-amylase
6. Which of the following is considered as a pretreatment to the biological feeds?
Options
A. Heating to denature the proteins
B. Addition of filter aids to increase the porosity
C. Addition of electrolytes
D. All of the above
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Correct Answer: All of the above
7. Filtration leaf test results indicate that the filtration rate of a protein product is 100 dry lbs/(ft
2
hr). What size production filter would be required to obtain 100 dry lbs of filter cake/hr?
Options
A. 1.54 ft
2
B. 3.08 ft
2
C. 65 ft
2
D. 65 lbs/ ft
2
.hr
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Correct Answer: 1.54 ft
2
8. For the turbulent flow, the dispersion coefficient is correlated as a function of
Options
A. Reynolds number
B. Sherwood number
C. Schmidt number
D. Grashof number
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Correct Answer: Reynolds number
9. The common methods used for disinfection in waste water treatment plants are
Options
A. chlorination
B. UV light
C. both (a) and (b)
D. Phenolic solvent
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Correct Answer: both (a) and (b)
10. The mechanism of air filtration in fibrous filter is
Options
A. electrostatic attraction
B. impaction
C. interception
D. all of these
Show Answer
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Correct Answer: all of these
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Enzymes and Application
Enzymes and Kinetics
Fermentation Kinetics
Fermentation Reactors
Fluid Flow
Immobilized Enzyme
Sterilization
Water Treatment