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Home Biochemical Engineering Sterilization Comments

  • Question
  • 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

  • Correct Answer
  • adiabatic conditions 


  • Sterilization problems


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    • 1. 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
    • 2. 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
    • 3. 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
    • 4. 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
    • 5. Which of the following impellers are used for wide range of viscosities?

    • Options
    • A. paddles
    • B. turbines
    • C. propellers
    • D. none of these
    • Discuss
    • 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
    • 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
    • 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
    • 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
    • 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


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