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MCQs

Total Questions : 80 | Page 1 of 8 pages
Question 1. Oxidation ditch is an extended activated sludge process.
  1.    True
  2.    False
  3.    May be True or False
  4.    Can't say
 Discuss Question
Answer: Option A. -> True
Answer: (a).True
Question 2. What is the shape of the oxidation ditch?
  1.    Square
  2.    Rectangular
  3.    Circular
  4.    Oval
 Discuss Question
Answer: Option D. -> Oval
Answer: (d).Oval
Question 3. Anaerobic conditions occur at the bottom of the ditches.
  1.    True
  2.    False
  3.    May be True or False
  4.    Can't say
 Discuss Question
Answer: Option B. -> False
Answer: (b).False
Question 4. The ditch is lined by _______ layer.
  1.    Brick
  2.    Cement
  3.    Permeable
  4.    Impermeable
 Discuss Question
Answer: Option D. -> Impermeable
Answer: (d).Impermeable
Question 5. What is the range of liquid depth in oxidation ditches?
  1.    0.2-0.3 m
  2.    0.3-0.5 m
  3.    0.5-0.9 m
  4.    0.9-1.5 m
 Discuss Question
Answer: Option D. -> 0.9-1.5 m
Answer: (d).0.9-1.5 m
Question 6. What is the efficiency in reducing the BOD of a tank consisting of Biox media?
  1.    90%
  2.    80%
  3.    85%
  4.    95%
 Discuss Question
Answer: Option A. -> 90%
Answer: (a).90%
Question 7. What is the depth of biox media generally considered for an aeration tank?
  1.    1.2 m
  2.    3 m
  3.    5 m
  4.    2.5 m
 Discuss Question
Answer: Option A. -> 1.2 m
Answer: (a).1.2 m
Question 8. Calculate the volume of the tank for the following information.
BOD: 400 mg/L
Flow: 3500 m³/h
Loading rate of media: 3.5 Kg/ m³/day
  1.    9600 m³
  2.    9000 m³
  3.    2000 m³
  4.    4000 m³
 Discuss Question
Answer: Option D. -> 4000 m³
Answer: (d).4000 m³
Question 9. What is the load considered for biox media?
  1.    1.8 kg/m³
  2.    2.6 kg/m³
  3.    6 kg/m³
  4.    3.6 kg/m³
 Discuss Question
Answer: Option A. -> 1.8 kg/m³
Answer: (a).1.8 kg/m³
Question 10. Calculate the area required for the system consisting of biox media for the following data.
Flow: 500 m³/h.
BOD: 500 mg/L
  1.    8 m³
  2.    3.4 m³
  3.    3 m³
  4.    4.4 m³
 Discuss Question
Answer: Option B. -> 3.4 m³
Answer: (b).3.4 m³

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