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MCQs

Total Questions : 76 | Page 6 of 8 pages
Question 51. Which of the following methods is used in both dewatering and thickening?
  1.    Filter press
  2.    Centrifuge
  3.    Gravity belt
  4.    Rotary drum
 Discuss Question
Answer: Option B. -> Centrifuge
Answer: (b).Centrifuge
Question 52. At what temperature the sludge constituting biosolids is heated, when it is treated by the pasteurization method?
  1.    45 degree Celsius
  2.    55 degree Celsius
  3.    70 degree Celsius
  4.    65 degree Celsius
 Discuss Question
Answer: Option C. -> 70 degree Celsius
Answer: (c).70 degree Celsius
Question 53. What is the solid retention time assumed when the sludge constituting biosolids is treated anaerobically?
  1.    7 days
  2.    4 days
  3.    15 days
  4.    10 days
 Discuss Question
Answer: Option C. -> 15 days
Answer: (c).15 days
Question 54. For a return activated sludge pump what is the type of pump preferred?
  1.    Plunger
  2.    Peristaltic pump
  3.    Submersible
  4.    Non-clog
 Discuss Question
Answer: Option D. -> Non-clog
Answer: (d).Non-clog
Question 55. For removing the digested biosolids which type of pump is preferred?
  1.    Submersible
  2.    Non-clog pumps
  3.    Vertical turbine pump
  4.    Plunger pump
 Discuss Question
Answer: Option D. -> Plunger pump
Answer: (d).Plunger pump
Question 56. The organisms feed on _____ in aeration tanks.
  1.    Water
  2.    Air
  3.    Sludge particles
  4.    Bacteria
 Discuss Question
Answer: Option C. -> Sludge particles
Answer: (c).Sludge particles
Question 57. The sludge particles concentration is increased by the growth of the organism in aeration tanks.
  1.    True
  2.    False
  3.    May be True or False
  4.    Can't say
 Discuss Question
Answer: Option B. -> False
Answer: (b).False
Question 58. Mechanical stirring can be done instead of injection of air from the bottom.
  1.    True
  2.    False
  3.    May be True or False
  4.    Can't say
 Discuss Question
Answer: Option A. -> True
Answer: (a).True
Question 59. Sewage treatment plant is a part of secondary treatment.
  1.    True
  2.    False
  3.    May be True or False
  4.    Can't say
 Discuss Question
Answer: Option A. -> True
Answer: (a).True
Question 60. Calculate the volume of the aeration tank required for the following data:
Flow: 800 m³/d
BOD: 1000 mg/L
F/M ratio: 0.15(extended aeration)
MLSS: 3500 mg/L
  1.    1550 m³
  2.    2550 m³
  3.    3550 m³
  4.    4550 m³
 Discuss Question
Answer: Option A. -> 1550 m³
Answer: (a).1550 m³

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