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MCQs

Total Questions : 94 | Page 2 of 10 pages
Question 11. What is the first step in the sewage treatment process?
  1.    Dewatering
  2.    Thickening
  3.    Phosphorus recovery
  4.    Digestion
 Discuss Question
Answer: Option B. -> Thickening
Answer: (b).Thickening
Question 12. Sludge from the primary clarifier is ______
  1.    Brown and flocculant like appearance
  2.    Dark in colour
  3.    Gray and slimy
  4.    Dark brown in colour
 Discuss Question
Answer: Option C. -> Gray and slimy
Answer: (c).Gray and slimy
Question 13. Wₛ = Wₛₚ + Wₛₛ
What does Wₛₚ stand for in the above equation?
  1.    Total dry solids
  2.    Raw primary solids
  3.    Suspended solids
  4.    Polluted solids
 Discuss Question
Answer: Option B. -> Raw primary solids
Answer: (b).Raw primary solids
Question 14. What is the percentage of aerobically digested sludge?
  1.    0.2-0.5
  2.    0.3-0.6
  3.    1.0-2.0
  4.    1.5-3.0
 Discuss Question
Answer: Option C. -> 1.0-2.0
Answer: (c).1.0-2.0
Question 15. What is the amount of solids released into wastewater by human beings?
  1.    30 gpcd
  2.    40 gpcd
  3.    60 gpcd
  4.    70 gpcd
 Discuss Question
Answer: Option D. -> 70 gpcd
Answer: (d).70 gpcd
Question 16. How does the chemical sludge appear?
  1.    Gray in colour and not slimy
  2.    Brown and flocculant like appearance
  3.    Red/grayish brown
  4.    Black in colour
 Discuss Question
Answer: Option C. -> Red/grayish brown
Answer: (c).Red/grayish brown
Question 17. What is the percentage of dry solids assumed for the sludge at the outlet of a centrifuge?
  1.    10-15%
  2.    1-3%
  3.    4-8%
  4.    9-12%
 Discuss Question
Answer: Option C. -> 4-8%
Answer: (c).4-8%
Question 18. What is the percentage of dry solids for the primary sludge assumed at the outlet of aerobic digester?
  1.    1-2.5%
  2.    7-10.5%
  3.    2.5-7%
  4.    10.5-12.5%
 Discuss Question
Answer: Option C. -> 2.5-7%
Answer: (c).2.5-7%
Question 19. What is the % of dry solids assumed for a primary sludge from a settling tank at the outlet?
  1.    12%
  2.    5-7%
  3.    8%
  4.    9-11%
 Discuss Question
Answer: Option B. -> 5-7%
Answer: (b).5-7%
Question 20. How does the activated sludge appear?
  1.    Gray
  2.    Red
  3.    Brown and flocculant like appearance
  4.    Greasy
 Discuss Question
Answer: Option C. -> Brown and flocculant like appearance
Answer: (c).Brown and flocculant like appearance

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