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MCQs

Total Questions : 103 | Page 7 of 11 pages
Question 61. Lamella Clarifier works on which principle?
  1.    Cocurrent settling
  2.    Countercurrent settling
  3.    Cross flow settling
  4.    Hindered settling
 Discuss Question
Answer: Option B. -> Countercurrent settling
Answer: (b).Countercurrent settling
Question 62. How is the critical concentration of sludge thickener tank calculated?
  1.    Hᵤ= C₀² H₀/ Cu
  2.    Hᵤ= C₀ H₀/ Cu²
  3.    Hᵤ= Cu H₀/ C₀S
  4.    Hᵤ= C₀ H₀/ Cu
 Discuss Question
Answer: Option D. -> Hᵤ= C₀ H₀/ Cu
Answer: (d).Hᵤ= C₀ H₀/ Cu
Question 63. How is the area of a sludge thickening tank calculated?
  1.    A=2QTₐ/H₀
  2.    A=QTₐ/H₀
  3.    A=QTₐ/2H₀
  4.    A=QTₐ/H₀²
 Discuss Question
Answer: Option B. -> A=QTₐ/H₀
Answer: (b).A=QTₐ/H₀
Question 64. What is the major assumption made when solid flux method is used to find the area of the sedimentation basin?
  1.    Settling basin is not operating at a steady state
  2.    Settling basin is operating at an adiabatic state
  3.    Settling basin is operating at a steady state
  4.    Settling basin is operating at an isobaric state
 Discuss Question
Answer: Option C. -> Settling basin is operating at a steady state
Answer: (c).Settling basin is operating at a steady state
Question 65. What are the ponds constructed for removing entrained solids called?
  1.    Clarifiers
  2.    Settling basins
  3.    Eco-ponds
  4.    Ditches
 Discuss Question
Answer: Option B. -> Settling basins
Answer: (b).Settling basins
Question 66. How is the height of the sludge calculated in a sludge drying bed?
  1.    Hₜ-Hₓ=(H₂-Hₓ)eiᵗ²
  2.    Hₜ=(H₂-Hₓ)eiᵗ²
  3.    Hₜ-Hₓ=(H₂)eiᵗ²
  4.    Hₜ-Hₓ=(Hₓ)eiᵗ²
 Discuss Question
Answer: Option A. -> Hₜ-Hₓ=(H₂-Hₓ)eiᵗ²
Answer: (a).Hₜ-Hₓ=(H₂-Hₓ)eiᵗ²
Question 67. Sedimentation is a process using gravity to remove suspended solids from water.
  1.    True
  2.    False
  3.    May be True or False
  4.    Can't say
 Discuss Question
Answer: Option A. -> True
Answer: (a).True
Question 68. The tanks built with mechanical means for continuous removal of solids being deposited by sedimentation are called _________
  1.    Clarifiers
  2.    Settling basins
  3.    Sedimentation tanks
  4.    Eco-pons
 Discuss Question
Answer: Option A. -> Clarifiers
Answer: (a).Clarifiers
Question 69. Sludge is disposed through _______
  1.    Hopper bottom
  2.    Sludge pump
  3.    Deflector
  4.    Launder
 Discuss Question
Answer: Option B. -> Sludge pump
Answer: (b).Sludge pump
Question 70. In a primary sedimentation tank in percentage what is the amount of BOD removed?
  1.    40-50%
  2.    20-40%
  3.    60-70%
  4.    20-30%
 Discuss Question
Answer: Option B. -> 20-40%
Answer: (b).20-40%

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