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MCQs

Total Questions : 103 | Page 8 of 11 pages
Question 71. ________ is provided after activated sludge process.
  1.    Primary sedimentation tank
  2.    Flocculation tank
  3.    Secondary sedimentation tank
  4.    Sand filter
 Discuss Question
Answer: Option C. -> Secondary sedimentation tank
Answer: (c).Secondary sedimentation tank
Question 72. What is the detention time considered while designing a primary sedimentation tank which is followed by a secondary treatment tank?
  1.    1 hr
  2.    1.5-2.5 hrs
  3.    3 hrs
  4.    3-4 hrs
 Discuss Question
Answer: Option B. -> 1.5-2.5 hrs
Answer: (b).1.5-2.5 hrs
Question 73. In a primary sedimentation tank in percentage what is the amount of TSS removed?
  1.    40-50%
  2.    50-70%
  3.    80%
  4.    85%
 Discuss Question
Answer: Option B. -> 50-70%
Answer: (b).50-70%
Question 74. What is the density of alum content used in water treatment?
  1.    9.8 lb/gal
  2.    10.1 lb/gal
  3.    11.1 lb/gal
  4.    9.2 lb/gal
 Discuss Question
Answer: Option C. -> 11.1 lb/gal
Answer: (c).11.1 lb/gal
Question 75. Alum precipitation occurs at which pH?
  1.    1-3
  2.    3-5
  3.    5-7
  4.    7-9
 Discuss Question
Answer: Option C. -> 5-7
Answer: (c).5-7
Question 76. Microflocculation is brought about by which phenomenon?
  1.    Velocity gradient
  2.    Differential settling
  3.    Brownian movement
  4.    Differential mixing
 Discuss Question
Answer: Option C. -> Brownian movement
Answer: (c).Brownian movement
Question 77. What is the speed of the impeller in a flash mixer?
  1.    90 rpm
  2.    100 rpm
  3.    110 rpm
  4.    120 rpm
 Discuss Question
Answer: Option C. -> 110 rpm
Answer: (c).110 rpm
Question 78. Macro flocculation is brought about by which phenomenon?
  1.    Velocity gradient
  2.    Differential settling
  3.    Brownian movement
  4.    Differential mixing
 Discuss Question
Answer: Option A. -> Velocity gradient
Answer: (a).Velocity gradient
Question 79. Why is Ferric ammonium sulfate generally not used as a coagulant?
  1.    It is very expensive
  2.    It is dependent on the Dissolved oxygen present in the waste water
  3.    It is a very slow process
  4.    It works only at high pH
 Discuss Question
Answer: Option B. -> It is dependent on the Dissolved oxygen present in the waste water
Answer: (b).It is dependent on the Dissolved oxygen present in the waste water
Question 80. In percentage what is the amount of BOD removed by chemical clarification?
  1.    20-30 %
  2.    50-80 %
  3.    30-50 %
  4.    80-90 %
 Discuss Question
Answer: Option B. -> 50-80 %
Answer: (b).50-80 %

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