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MCQs

Total Questions : 90 | Page 5 of 9 pages
Question 41. Which of the following filter is used in the anaerobic treatment of sewage?
  1.    Intermittent sand
  2.    Trickling filter
  3.    Contact filter
  4.    Biological filter
 Discuss Question
Answer: Option D. -> Biological filter
Answer: (d).Biological filter
Question 42. The maximum size of filter media of a percolating filter is ___________
  1.    10mm
  2.    25mm
  3.    60mm
  4.    75mm
 Discuss Question
Answer: Option D. -> 75mm
Answer: (d).75mm
Question 43. The minimum hydraulic loading of percolating filter is ___________
  1.    1 m³/m²/day
  2.    2 m³/m²/day
  3.    3 m³/m²/day
  4.    4 m³/m²/day
 Discuss Question
Answer: Option A. -> 1 m³/m²/day
Answer: (a).1 m³/m²/day
Question 44. The recirculation ratio for the low rate trickling filter is ___________
  1.    1
  2.    2
  3.    3
  4.    0
 Discuss Question
Answer: Option D. -> 0
Answer: (d).0
Question 45. The breaking of the biomass from the slime layer in conventional filter is called _____
  1.    Sloughing
  2.    Carbonation
  3.    Biological magnification
  4.    Weathering
 Discuss Question
Answer: Option A. -> Sloughing
Answer: (a).Sloughing
Question 46. Which of the following is called as a conventional trickling filter?
  1.    Rapid sand filter
  2.    Slow sand filter
  3.    High rate trickling filter
  4.    Low rate trickling filter
 Discuss Question
Answer: Option D. -> Low rate trickling filter
Answer: (d).Low rate trickling filter
Question 47. The BOD after the filtration of sewage from the low rate trickling filter is ___________
  1.    40-50%
  2.    80-90%
  3.    70-80%
  4.    90-99%
 Discuss Question
Answer: Option B. -> 80-90%
Answer: (b).80-90%
Question 48. The removal of BOD is independent of the loading conditions in infiltration process.
  1.    True
  2.    False
  3.    May be True or False
  4.    Can't say
 Discuss Question
Answer: Option B. -> False
Answer: (b).False
Question 49. The efficiency of a percolating filter is given by ___________
  1.    100/(1+0.0044 (μ))
  2.    100/(1+0.044 (μ)½)
  3.    100/(1+0.44 (μ)½)
  4.    100/(1+0.0044 (μ)½)
 Discuss Question
Answer: Option D. -> 100/(1+0.0044 (μ)½)
Answer: (d).100/(1+0.0044 (μ)½)
Question 50. The organic loading in low rate trickling filter is 900 kg/hectare-meter/day. What is the efficiency of the filter?
  1.    43.1%
  2.    88.3%
  3.    7.04%
  4.    83%
 Discuss Question
Answer: Option B. -> 88.3%
Answer: (b).88.3%

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