Discussion
Home ‣ Biochemical Engineering ‣ Sterilization Comments
- Question
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
- Correct Answer
- first order chemical reaction
- 1. The heat conduction in dry air is
Options- A. less rapid than in steam
- B. more rapid than in steam
- C. similar to steam
- D. none of these Discuss
- 2. 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
- 3. The collection efficiency by impaction increases with
Options- A. increasing particle diameter
- B. increasing air flow velocity
- C. both (a) and (b)
- D. increasing particle size Discuss
- 4. The value of K
Options- A. increases with increase in air velocity
- B. decreases with increase in air velocity
- C. increases to an optimum with increase in air velocity and decreases on further increase of air velocity
- D. none of these Discuss
- 5. The moist heat is more effective than the dry heat because the intrinsic heat resistance of vegetative cells is greatly
Options- A. increased in a dry state
- B. decreased in a dry state
- C. increased in a wet state
- D. decreased in a wet state Discuss
- 6. For laminar flow of Newtonian fluid through a smooth round pipe, the ratio of average fluid velocity to the maximum velocity is
Options- A. 0.5
- B. 0.75
- C. 0.87
- D. 0.37 Discuss
- 7. Sterilization can be carried out by
Options- A. heat
- B. radiation
- C. chemical agents
- D. all of these Discuss
- 8. The highest temperature which appears to be feasible for batch sterilization is
Options- A. 121°C
- B. 100°C
- C. 105°C
- D. 130°C Discuss
- 9. The X90 value for a filtration system is
Options- A. the time required to reduce microbial population by 90%
- B. the time required to traverse survivor curve by one log cycle.
- C. the depth required to reduce population by 90%
- D. the depth of the filter required to reduce population by 99% Discuss
- 10. In sterilization process, spore of which of the following organism is considered as control?
Options- A. Bacillus subtilis
- B. Clostridium botulinum
- C. Bacillus stearothermophilus
- D. Aspergillus niger Discuss
Sterilization problems
Search Results
Correct Answer: less rapid than in steam
Correct Answer: 1 - ?imp?int?dif
Correct Answer: both (a) and (b)
Correct Answer: increases to an optimum with increase in air velocity and decreases on further increase of air velocity
Correct Answer: increased in a dry state
Correct Answer: 0.5
Correct Answer: all of these
Correct Answer: 121°C
Correct Answer: the depth required to reduce population by 90%
Correct Answer: Bacillus stearothermophilus
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