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MCQs

Total Questions : 73 | Page 4 of 8 pages
Question 31. The moist heat is more effective than the dry heat because the intrinsic heat resistance of vegetative cells is greatly
  1.    increased in a dry state
  2.    decreased in a dry state
  3.    increased in a wet state
  4.    decreased in a wet state
 Discuss Question
Answer: Option A. -> increased in a dry state
Answer: (a).increased in a dry state
Question 32. The value of K
  1.    increases with increase in air velocity
  2.    decreases with increase in air velocity
  3.    increases to an optimum with increase in air velocity and decreases on further increase of air velocity
  4.    none of these
 Discuss Question
Answer: Option C. -> increases to an optimum with increase in air velocity and decreases on further increase of air velocity
Answer: (c).increases to an optimum with increase in air velocity and decreases on further increase of air velocity
Question 33. The efficiency of fibrous filter by combined mechanism is given by(where ηimp,ηint,ηdif are the efficiencies by impaction, interception and diffusion respectively)
  1.    1 - ηimpηintηdif
  2.    1 - (1 - ηimp)(1 - ηint)( 1 - ηdif)
  3.    1 - ( ηimpηint/ηdif)
  4.    None of the above
 Discuss Question
Answer: Option A. -> 1 - ηimpηintηdif
Answer: (a).1 - ηimpηintηdif
Question 34. The collection efficiency by impaction increases with
  1.    increasing particle diameter
  2.    increasing air flow velocity
  3.    both (a) and (b)
  4.    increasing particle size
 Discuss Question
Answer: Option C. -> both (a) and (b)
Answer: (c).both (a) and (b)
Question 35. The heat conduction in dry air is
  1.    less rapid than in steam
  2.    more rapid than in steam
  3.    similar to steam
  4.    none of these
 Discuss Question
Answer: Option A. -> less rapid than in steam
Answer: (a).less rapid than in steam
Question 36. Model proposed by the Friedlander, correlating the air filtration efficiency by impaction can be expressed as (where NSt is the Stokes number)
  1.    ηimp = 0.075NSt1.2
  2.    ηimp = 0.75NSt1.2
  3.    ηimp = 0.25NSt1.2
  4.    ηimp = 0.025NSt1.2
 Discuss Question
Answer: Option A. -> ηimp = 0.075NSt1.2
Answer: (a).ηimp = 0.075NSt1.2
Question 37.  The specific death rate of an organism can be expressed as
  1.    ln 2/D
  2.    D/ln2
  3.    D.ln2
  4.    2.0.3/ln2
 Discuss Question
Answer: Option A. -> ln 2/D
Question 38.  The interception efficiency can be expressed as (where dp is the particle diameter and Dc cylindrical collection diameter)
  1.    dp/Dc
  2.    dp x Dc
  3.    dp/Dc x 100
  4.    dpDc/100
 Discuss Question
Answer: Option A. -> dp/Dc
Question 39.  The sterilization method depends
  1.    nature of additive
  2.    volume and feed rate
  3.    both (a) and (b)
  4.    none of these
 Discuss Question
Answer: Option C. -> both (a) and (b)
Question 40.  The filter material used for air filtration system is/are
  1.    glass wool
  2.    glass fibre
  3.    norite
  4.    all of the above
 Discuss Question
Answer: Option D. -> all of the above

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