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MCQs

Total Questions : 103 | Page 9 of 11 pages
Question 81. In percentage, how much does the chemical sludge contribute to the total sludge formed?
  1.    0.5 %
  2.    1 %
  3.    2 %
  4.    3 %
 Discuss Question
Answer: Option A. -> 0.5 %
Answer: (a).0.5 %
Question 82. What is the recommended surface loading rate in case of alum floc suspension?
  1.    30-70 m³/m².d
  2.    10-30 m³/m².d
  3.    70-100 m³/m².d
  4.    <10 m³/m².d
 Discuss Question
Answer: Option A. -> 30-70 m³/m².d
Answer: (a).30-70 m³/m².d
Question 83. In percentage what is the amount of TSS removed by chemical clarification?
  1.    50-60 %
  2.    60-70 %
  3.    70-80 %
  4.    80-90 %
 Discuss Question
Answer: Option D. -> 80-90 %
Answer: (d).80-90 %
Question 84. Assume in a sample of waste water around 60% TSS is removed by primary sedimentation without chemical addition. Calculate the mass of TSS removed for the following data.
Amount of TSS present initially: 220 mg/L
Waste water flow: 1000 m³/d
  1.    100 kg/d
  2.    130 kg/d
  3.    132 kg/d
  4.    102 kg/d
 Discuss Question
Answer: Option C. -> 132 kg/d
Answer: (c).132 kg/d
Question 85. At what pH is phosphate precipitated out?
  1.    8
  2.    6
  3.    9
  4.    10
 Discuss Question
Answer: Option D. -> 10
Answer: (d).10
Question 86. Determine the sludge formed from the following set of data.
Specific gravity of sludge: 1.05
Moisture content: 92.5%
Total dry solids: 213.4 kg/1000 m³
  1.    2.71 m³/d
  2.    2.75 m³/d
  3.    2.76 m³/d
  4.    3.71 m³/d
 Discuss Question
Answer: Option A. -> 2.71 m³/d
Answer: (a).2.71 m³/d
Question 87. Name the compound formed when lime is added in order to precipitate phosphate.
  1.    Hydroxylapatite
  2.    Ferric phosphate
  3.    Calcium phosphate
  4.    Calcium Carbonate
 Discuss Question
Answer: Option A. -> Hydroxylapatite
Answer: (a).Hydroxylapatite
Question 88. At which point, chemical addition for phosphorous removal can’t be carried out?
  1.    Preliminary treatment
  2.    Prior to primary sedimentation tank
  3.    Prior to secondary treatment
  4.    After secondary treatment
 Discuss Question
Answer: Option A. -> Preliminary treatment
Answer: (a).Preliminary treatment
Question 89. At what pH is the solubility of FePO₄ minimum?
  1.    3
  2.    5.3
  3.    4.3
  4.    6.3
 Discuss Question
Answer: Option B. -> 5.3
Answer: (b).5.3
Question 90. What is the ideal mixing time required for polymers?
  1.    60 secs
  2.    120 secs
  3.    10-30 secs
  4.    30-60 secs
 Discuss Question
Answer: Option C. -> 10-30 secs
Answer: (c).10-30 secs

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