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MCQs

Total Questions : 90 | Page 8 of 9 pages
Question 71. The maximum BOD removal efficiency of the Step aeration process of the activated sludge system is ___________
  1.    92%
  2.    80%
  3.    99%
  4.    78%
 Discuss Question
Answer: Option A. -> 92%
Answer: (a).92%
Question 72. _________ is defined as a volume in ml occupied by 1 gram of solid in the mixed liquor after 30 minutes of settling.
  1.    BOD loading
  2.    Suspended solid volume
  3.    Sludge volume index
  4.    Organic loading
 Discuss Question
Answer: Option C. -> Sludge volume index
Answer: (c).Sludge volume index
Question 73. Which of the following sludge process has maximum aeration period?
  1.    Conventional process
  2.    Extended process
  3.    Step aeration process
  4.    Tapered aeration
 Discuss Question
Answer: Option B. -> Extended process
Answer: (b).Extended process
Question 74. The design value of food to microorganism ratio in the tapered aeration sludge process is ___________
  1.    0.1
  2.    0.2
  3.    0.4
  4.    0.8
 Discuss Question
Answer: Option C. -> 0.4
Answer: (c).0.4
Question 75. BOD of sewage is dependent on food to microorganism ratio.
  1.    True
  2.    False
  3.    May be True or False
  4.    Can't say
 Discuss Question
Answer: Option A. -> True
Answer: (a).True
Question 76. _________ is the time at which sewage is detained in the aeration tank.
  1.    Average time
  2.    Detention time
  3.    Aeration period
  4.    Reaeration period
 Discuss Question
Answer: Option C. -> Aeration period
Answer: (c).Aeration period
Question 77. The design pressure of ____ is applied on pressure type flotation device.
  1.    1kg/cm²
  2.    2kg/cm²
  3.    3kg/cm²
  4.    6kg/cm²
 Discuss Question
Answer: Option C. -> 3kg/cm²
Answer: (c).3kg/cm²
Question 78. The design solid surface loading in an activated sludge process is ___________
  1.    10 kg/m²/day
  2.    25 kg/m²/day
  3.    15 kg/m²/day
  4.    35 kg/m²/day
 Discuss Question
Answer: Option B. -> 25 kg/m²/day
Answer: (b).25 kg/m²/day
Question 79. Which of the following plant nutrient is not found in municipal sewage?
  1.    Arsenic
  2.    Phosphorous
  3.    Potassium
  4.    Nitrogen
 Discuss Question
Answer: Option A. -> Arsenic
Answer: (a).Arsenic
Question 80. Which of the following has minimum hydraulic retention time?
  1.    Conventional process
  2.    Extended process
  3.    Modified aeration process
  4.    Complete mix process
 Discuss Question
Answer: Option C. -> Modified aeration process
Answer: (c).Modified aeration process

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