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MCQs

Total Questions : 94 | Page 8 of 10 pages
Question 71. Sludge treatment helps is reducing treatment costs.
  1.    True
  2.    False
  3.    May be True or False
  4.    Can't say
 Discuss Question
Answer: Option A. -> True
Answer: (a).True
Question 72. Which of the following methods are used in rural communities?
  1.    Aerobic digestion
  2.    Mechanical dewatering
  3.    Dewatering
  4.    Composting
 Discuss Question
Answer: Option D. -> Composting
Answer: (d).Composting
Question 73. In which year was the term Biosolids introduced?
  1.    1990
  2.    1995
  3.    1998
  4.    2000
 Discuss Question
Answer: Option C. -> 1998
Answer: (c).1998
Question 74. What is the term used for reuse of sewage sludge?
  1.    Compost
  2.    Solids
  3.    Biosolids
  4.    Sludge
 Discuss Question
Answer: Option C. -> Biosolids
Answer: (c).Biosolids
Question 75. In the case of anaerobic digestion, what is the percentage of dry solids for the primary sludge considered at the outlet?
  1.    2-5%
  2.    1-2%
  3.    10-12%
  4.    7-9%
 Discuss Question
Answer: Option A. -> 2-5%
Answer: (a).2-5%
Question 76. What is the concentration of polymer added to a belt filter press handling the primary sludge?
  1.    2-5 kg/Mg dry solids
  2.    1-4 kg/Mg dry solids
  3.    5-10 kg/Mg dry solids
  4.    10-12 kg/Mg dry solids
 Discuss Question
Answer: Option B. -> 1-4 kg/Mg dry solids
Answer: (b).1-4 kg/Mg dry solids
Question 77. What is the temperature at which sludge has to be frozen in order to carry out conditioning?
  1.    -2 to -5 degree
  2.    -20 to -25 degree
  3.    -5 to -8 degree
  4.    -10 to -20 degree
 Discuss Question
Answer: Option D. -> -10 to -20 degree
Answer: (d).-10 to -20 degree
Question 78. Heat treatment involves heating of the sludge. The supernatant from the heat treatment system is rich in ___________
  1.    TDS
  2.    TSS
  3.    BOD
  4.    Heavy metals
 Discuss Question
Answer: Option C. -> BOD
Answer: (c).BOD
Question 79. What is the maximum temperature up to which conditioning can be conducted?
  1.    50 degree
  2.    70 degree
  3.    60 degree
  4.    40 degree
 Discuss Question
Answer: Option C. -> 60 degree
Answer: (c).60 degree
Question 80. In __________ reactor the bed is filled with a packing material that expands when wastewater moves upwards.
  1.    Fluidized bed reactor
  2.    Packed bed reactor
  3.    Plug flow reactor
  4.    Mix batch reactor
 Discuss Question
Answer: Option A. -> Fluidized bed reactor
Answer: (a).Fluidized bed reactor

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