Discussion
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- Question
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
- Correct Answer
- 1 - ?imp?int?dif
- 1. 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
- 2. 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
- 3. 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
- 4. The collection efficiency by the inertial impaction mechanism is the function of
Options- A. Stokes and Reynolds number
- B. Stokes and Schmidt number
- C. Grashoff and Reynolds number
- D. Stokes and Grashof number Discuss
- 5. The heated medium passes through a holding section, which is usually maintained in
Options- A. adiabatic conditions
- B. isothermal conditions
- C. isotropic conditions
- D. isobaric conditions Discuss
- 6. 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
- 7. 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
- 8. 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
- 9. Sterilization can be carried out by
Options- A. heat
- B. radiation
- C. chemical agents
- D. all of these Discuss
- 10. 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
Sterilization problems
Search Results
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: Stokes and Reynolds number
Correct Answer: adiabatic conditions
Correct Answer: less rapid than in steam
Correct Answer: first order chemical reaction
Correct Answer: 0.5
Correct Answer: all of these
Correct Answer: 121°C
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