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MCQs

Total Questions : 90 | Page 9 of 9 pages
Question 81. The surface loading rate of a secondary clarifier is ______ litres/m²/day.
  1.    1000
  2.    10000
  3.    20000
  4.    40000
 Discuss Question
Answer: Option D. -> 40000
Answer: (d).40000
Question 82. The minimum weir loading rate of primary clarifier is ____m³/m/day.
  1.    125000
  2.    50000
  3.    10000
  4.    20000
 Discuss Question
Answer: Option A. -> 125000
Answer: (a).125000
Question 83. Which of the following is the cause of rising sludge?
  1.    Sedimentation
  2.    Denitrification
  3.    Chlorination
  4.    Flocculation
 Discuss Question
Answer: Option B. -> Denitrification
Answer: (b).Denitrification
Question 84. The detention period of a secondary clarifier is ___________
  1.    30 minutes
  2.    1 hour
  3.    2 hours
  4.    4 hours
 Discuss Question
Answer: Option C. -> 2 hours
Answer: (c).2 hours
Question 85. Hopper bottom vertical flow type tank is _____ in shape.
  1.    Circular
  2.    Triangular
  3.    Rectangular
  4.    Elliptical
 Discuss Question
Answer: Option A. -> Circular
Answer: (a).Circular
Question 86. The minimum detention period of combined aerator is ___________
  1.    1 hour
  2.    2 hours
  3.    3 hours
  4.    4 hours
 Discuss Question
Answer: Option C. -> 3 hours
Answer: (c).3 hours
Question 87. Dorroco aerator is a type of ___________
  1.    Combined aerator
  2.    Mechanical aerator
  3.    Ridge and furrow type aerator
  4.    Spiral flow type aerator
 Discuss Question
Answer: Option A. -> Combined aerator
Answer: (a).Combined aerator
Question 88. The speed at which the bubbles are formed in the simplex aerator?
  1.    15rpm
  2.    20rpm
  3.    60rpm
  4.    30rpm
 Discuss Question
Answer: Option C. -> 60rpm
Answer: (c).60rpm
Question 89. Which gas is produced in aerobic digestion of sludge?
  1.    NO₂
  2.    CO₂
  3.    O₂
  4.    H₂S
 Discuss Question
Answer: Option B. -> CO₂
Answer: (b).CO₂
Question 90. Simplex aerator is a type of ___________
  1.    Combined aerator
  2.    Mechanical aerator
  3.    Ridge and furrow type aerator
  4.    Spiral flow type aerator
 Discuss Question
Answer: Option B. -> Mechanical aerator
Answer: (b).Mechanical aerator

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