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- Question
A continuous reactor at steady state contains 0.04 g.l-1 of biomass and 0.02 g.l-1 of phenol. The feed contained 0.1 g.l-1 of phenol. The biomass yield would be
Options- A. 0.4 g.g-1
- B. 0.5 g.g-1
- C. 1.0 g.g-1
- D. 5.0 g.g-1
- Correct Answer
- 0.5 g.g-1
- 1. 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 Discuss
- 2. The destruction of microorganisms by steam may be described as
Options- A. first order chemical reaction
- B. zero order chemical reaction
- C. second order chemical reaction
- D. none of these Discuss
- 3. The efficiency of fibrous filter by combined mechanism is given by(where ?imp,?int,?dif are the efficiencies by impaction, interception and diffusion respectively)
Options- A. 1 - ?imp?int?dif
- B. 1 - (1 - ?imp)(1 - ?int)( 1 - ?dif)
- C. 1 - ( ?imp?int/?dif)
- D. None of the above Discuss
- 4. Which of the following would be correct concerning the concentration of biomass (X). growth limiting substrate (S) and product (P) in a chemostat when the cells have been washed out?
Options- A. X,S and P will be zero
- B. X,S and P can not be predicted for the above condition
- C. X and P will be zero while S is equal to the substrate concentration in feed
- D. None of the above Discuss
- 5. The relatively large volume (10 to 40% of total fermenter volume) of the seed culture is employed to
Options- A. increase the overall fermentation time
- B. increase the overall yield of biomass
- C. decrease the overall fermentation time
- D. decrease the overall yield of product Discuss
- 6. A fermentation system has a KLa of 3 s-1 and a C0* of 5 ppm of O2. If the bulk liquid is completely depleted of oxygen, then the oxygen transfer rate will be equal to
Options- A. zero
- B. 15 mg.l-1.s-1
- C. 10 mg.l-1.s-1
- D. 5 mg.l-1.s-1 Discuss
- 7. In a two-phase system where the continuous phase remains in place, the gas hold up can be expressed as (where Vs and Vt are the superficial gas velocity and bubble rise velocity)
Options- A. H = Vs/(Vs-Vt)
- B. H = Vs/(Vs+ Vt)
- C. H = Vs/(Vs.Vt)
- D. H = (Vs+Vt)/Vs Discuss
- 8. Enzymes degrade, alter or synthesize a food component through
Options- A. oxidation/reduction/isomerization
- B. hydrolysis/synthesis
- C. group transfer
- D. all of the above Discuss
- 9. 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 Discuss
- 10. The plot commonly used for determining the value of Vmax is
Options- A. Lineweaver Burk plot
- B. Langmuir plot
- C. Eadie Hofstee plot
- D. all of these Discuss
More questions
Correct Answer: pseudoplastic, thixotropic fluid
Correct Answer: first order chemical reaction
Correct Answer: 1 - ?imp?int?dif
Correct Answer: X and P will be zero while S is equal to the substrate concentration in feed
Correct Answer: decrease the overall fermentation time
Correct Answer: 15 mg.l-1.s-1
Correct Answer: H = Vs/(Vs+ Vt)
Correct Answer: all of the above
Correct Answer: all of these
Correct Answer: all of these
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