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MCQs

Total Questions : 103 | Page 10 of 11 pages
Question 91. Addition of which of these result in lowering the BOD level?
  1.    Lime
  2.    Polymer
  3.    Aluminum salts
  4.    Ferrous salts
 Discuss Question
Answer: Option B. -> Polymer
Answer: (b).Polymer
Question 92. What is the detention time assumed while designing a flocculator?
  1.    10 mins
  2.    20 mins
  3.    45 mins
  4.    60 mins
 Discuss Question
Answer: Option B. -> 20 mins
Answer: (b).20 mins
Question 93. Calculate the volume of flocculator for the following data:
Flow rate: 2200m³/hr
  1.    733 m³
  2.    855 m³
  3.    933 m³
  4.    785 m³
 Discuss Question
Answer: Option A. -> 733 m³
Answer: (a).733 m³
Question 94. Which mode of settling are tube settlers based on?
  1.    Counter current settling
  2.    Cocurrent settling
  3.    Cross flow settling
  4.    Flocculant settling
 Discuss Question
Answer: Option A. -> Counter current settling
Answer: (a).Counter current settling
Question 95. What is the product obtained when a coagulant is mixed with wastewater?
  1.    Sediments
  2.    Acid
  3.    Floc
  4.    Grit
 Discuss Question
Answer: Option A. -> Sediments
Answer: (a).Sediments
Question 96. What is type IV settling also called as?
  1.    Zone settling
  2.    Hindered settling
  3.    Compression settling
  4.    Expansion settling
 Discuss Question
Answer: Option C. -> Compression settling
Answer: (c).Compression settling
Question 97. In countercurrent settling how is the solid suspension fed?
  1.    From the bottom
  2.    From the sides
  3.    From the top
  4.    Flow is up the plates
 Discuss Question
Answer: Option C. -> From the top
Answer: (c).From the top
Question 98. How is the length of the surface calculated in case of countercurrent settling?
  1.    Lₚ = wVꝋ/ v cos Ɵ
  2.    Lₚ = (Vꝋ – V sinƟ)/ v cos Ɵ
  3.    Lₚ =w (Vꝋ – V sinƟ)
  4.    Lₚ = w(Vꝋ – V sinƟ)/ v cos Ɵ
 Discuss Question
Answer: Option D. -> Lₚ = w(Vꝋ – V sinƟ)/ v cos Ɵ
Answer: (d).Lₚ = w(Vꝋ – V sinƟ)/ v cos Ɵ
Question 99. How many hours does the removing of Settleable particles require in fill and draw type of sedimentation tanks?
  1.    3-6
  2.    6-9
  3.    6-12
  4.    12-15
 Discuss Question
Answer: Option C. -> 6-12
Answer: (c).6-12
Question 100. What is the maximum permissible velocity in horizontal flow type sedimentation tank?
  1.    0.2 m/s
  2.    0.3 m/s
  3.    0.5 m/s
  4.    1 m/s
 Discuss Question
Answer: Option B. -> 0.3 m/s
Answer: (b).0.3 m/s

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