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Home Biochemical Engineering Sterilization Comments

  • Question
  • 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

  • Correct Answer
  • ln 2/D 


  • Sterilization problems


    Search Results


    • 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
    • 2. Which of the following impellers are used for wide range of viscosities?

    • Options
    • A. paddles
    • B. turbines
    • C. propellers
    • D. none of these
    • Discuss
    • 3. The volume of liquid (VL) in a cylindrical reactor can be calculated from the liquid height (HL) and tank diameter (Dt) using the following equation

    • Options
    • A. VL = 4/3 x ? x HL x Dt3/8
    • B. VL= HL x ? x Dt2/4
    • C. VL= HL x ? x Dt2
    • D. VL = 4 x ? x Dt2
    • Discuss
    • 4. What is the ratio of diameter of impeller to the diameter of tank (Da:Dt)?

    • Options
    • A. 1 : 3
    • B. 2 : 1
    • C. 4 : 1
    • D. 1 : 5
    • Discuss
    • 5. Radial flow impellers

    • Options
    • A. provide high shear conditions for breaking up bubbles
    • B. direct flow towards the walls of the reactor
    • C. Both (a) and (b)
    • D. provide low shear conditions and are suited for use in shear sensitive procesess
    • Discuss
    • 6. 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
    • 7. 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
    • 8. 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
    • 9. 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
    • 10. 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


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