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  • Question
  • 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

  • Correct Answer
  • both (a) and (b) 


  • Sterilization problems


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    • 1. 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
    • 2. 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
    • 3. 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
    • 4. 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
    • 5. 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
    • 6. 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
    • 7. 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
    • 8. 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
    • 9. 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
    • 10. Sterilization can be carried out by

    • Options
    • A. heat
    • B. radiation
    • C. chemical agents
    • D. all of these
    • Discuss


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