Sterilization problems
- 1. The relationship between the del factor, temperature and time is given as
Options- A. ? = A.t. e-E/RT
- B. ? = 1/(A.t. e-E/RT)
- C. ? = A.t. eE/RT
- D. ? = A.t.T Discuss
Correct Answer: ? = A.t. e-E/RT
- 2. 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 Discuss
Correct Answer: ln 2/D
- 3. The radius of the filter with a depth of 14 cm required for a volumetric airflow rate of 10 m3/min is approximately
Options- A. 1.6 m
- B. 0.6 m
- C. 3
- D. 6 m Discuss
Correct Answer: 0.6 m
- 4. The collection efficiency by interception increases with the
Options- A. increasing particle diameter
- B. increasing air flow velocity
- C. both (a) and (b)
- D. increasing particle size Discuss
Correct Answer: increasing particle size
- 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
Correct Answer: adiabatic conditions
- 6. 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
Correct Answer: Stokes and Reynolds number
- 7. 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
Correct Answer: increased in a dry state
- 8. 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
Correct Answer: increases to an optimum with increase in air velocity and decreases on further increase of air velocity
- 9. 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
Correct Answer: both (a) and (b)
- 10. 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
Correct Answer: 1 - ?imp?int?dif
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