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MCQs

Total Questions : 90 | Page 3 of 9 pages
Question 21. Which of the following is called as air diffusion method?
  1.    Activated sludge aeration
  2.    Diffused air aeration
  3.    Mechanical aeration
  4.    Combined aeration
 Discuss Question
Answer: Option B. -> Diffused air aeration
Answer: (b).Diffused air aeration
Question 22. The maximum quantity of air required in diffused aerator is ______ m³ per million litres of sewage.
  1.    4000
  2.    5000
  3.    6000
  4.    8000
 Discuss Question
Answer: Option D. -> 8000
Answer: (d).8000
Question 23. The effective area of the diffuser plate used in the aeration tank is ___________
  1.    400cm²
  2.    780cm²
  3.    1160cm²
  4.    800cm²
 Discuss Question
Answer: Option B. -> 780cm²
Answer: (b).780cm²
Question 24. The maximum depth of aeration tank used in activated sludge process is ___________
  1.    1m
  2.    2m
  3.    4.5m
  4.    5.5m
 Discuss Question
Answer: Option C. -> 4.5m
Answer: (c).4.5m
Question 25. Which device is used in the aeration tank for cleaning purposes?
  1.    Diffuser plate
  2.    Paddles
  3.    Tube diffuser
  4.    Header pipe
 Discuss Question
Answer: Option C. -> Tube diffuser
Answer: (c).Tube diffuser
Question 26. With how much pressure the air is filled in the aeration tank?
  1.    70-90kN/m²
  2.    34-56kN/m²
  3.    10-20kN/m²
  4.    35-70kN/m²
 Discuss Question
Answer: Option D. -> 35-70kN/m²
Answer: (d).35-70kN/m²
Question 27. With which device, the air is introduced in the aeration tank?
  1.    Diffuser plate
  2.    Paddles
  3.    Cone with spiral vanes
  4.    Header pipe
 Discuss Question
Answer: Option A. -> Diffuser plate
Answer: (a).Diffuser plate
Question 28. The device used for the aeration in the combined aerator is ___________
  1.    Header pipe
  2.    Diffuser plate and paddles
  3.    Cone with spiral vanes
  4.    Diffuser plate
 Discuss Question
Answer: Option B. -> Diffuser plate and paddles
Answer: (b).Diffuser plate and paddles
Question 29. The detention period of the Sheffield mechanical aeration tank is ___________
  1.    15 hours
  2.    1minute
  3.    1 hour
  4.    4 hours
 Discuss Question
Answer: Option A. -> 15 hours
Answer: (a).15 hours
Question 30. The effective area of tube diffuser used in the aeration tank is ___________
  1.    400cm²
  2.    780cm²
  3.    1160cm²
  4.    800cm²
 Discuss Question
Answer: Option C. -> 1160cm²
Answer: (c).1160cm²

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