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MCQs

Total Questions : 181 | Page 14 of 19 pages
Question 131. Settling tank efficiency is reduced by _______
i. Eddy current
ii. Surface current
iii. Density current
  1.    i, ii
  2.    i, ii, iii
  3.    ii, iii
  4.    i, iii
 Discuss Question
Answer: Option B. -> i, ii, iii
Answer: (b).i, ii, iii
Question 132. What will be the surface area of the basin for a flow of 2*10⁶ litre per day having a surface loading rate 10,000 litre/day/m²?
  1.    100
  2.    200
  3.    300
  4.    400
 Discuss Question
Answer: Option B. -> 200
Answer: (b).200
Question 133. 1cm per second settling velocity corresponds to a surface loading of ______ litre per day per m².
  1.    36000
  2.    864000
  3.    24000
  4.    6000
 Discuss Question
Answer: Option B. -> 864000
Answer: (b).864000
Question 134. The detention period of the vertical flow clarifier is _______
  1.    1-1.5
  2.    2
  3.    3.5
  4.    4
 Discuss Question
Answer: Option A. -> 1-1.5
Answer: (a).1-1.5
Question 135. The design value of surface loading for horizontal flow circular sedimentation is _______
  1.    30-40m³/m²/d
  2.    20-30m³/m²/d
  3.    10-20m³/m²/d
  4.    50-100m³/m²/d
 Discuss Question
Answer: Option A. -> 30-40m³/m²/d
Answer: (a).30-40m³/m²/d
Question 136. Detention time for a circular tank is given by _______
  1.    t = D (D + 0.785H) /Q
  2.    t = D (0.1D + 0.785H) /Q
  3.    t = D2 (0.01D + 0.785H)
  4.    t = D2 (0.01D + 0.785H) /Q
 Discuss Question
Answer: Option D. -> t = D2 (0.01D + 0.785H) /Q
Answer: (d).t = D2 (0.01D + 0.785H) /Q
Question 137. The chemical composition of Alum is _____________
  1.    Al₂ (SO₄)₃.18H₂O
  2.    Al₂ (SO₄)₂.18H₂O
  3.    Al₃ (SO₄)₂.18H₂O
  4.    Al₄ (SO₄)₃.18H₂O
 Discuss Question
Answer: Option A. -> Al₂ (SO₄)₃.18H₂O
Answer: (a).Al₂ (SO₄)₃.18H₂O
Question 138. What is formed when coagulant is added to water?
  1.    Scum
  2.    Soap
  3.    Bubbles
  4.    Floc
 Discuss Question
Answer: Option D. -> Floc
Answer: (d).Floc
Question 139. The chemical compound which is insoluble in water, formed when alum is added to water is _____________
  1.    Al (OH)₃
  2.    CaSO₄
  3.    CO₂
  4.    Ca (OH)₃
 Discuss Question
Answer: Option A. -> Al (OH)₃
Answer: (a).Al (OH)₃
Question 140. The sedimentation basin should be made as deep as possible.
  1.    True
  2.    False
  3.    May be True or False
  4.    Can't say
 Discuss Question
Answer: Option B. -> False
Answer: (b).False

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