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MCQs

Total Questions : 80 | Page 8 of 8 pages
Question 71. Which of the following methods consume the most power?
  1.    Anaerobic digestion
  2.    Aerated lagoon
  3.    Aerated lagoon carried out facultatively
  4.    Aerated lagoon with solid recycling
 Discuss Question
Answer: Option D. -> Aerated lagoon with solid recycling
Answer: (d).Aerated lagoon with solid recycling
Question 72. The facultative pond functions like a ________
  1.    Primary clarifier
  2.    Secondary clarifier
  3.    Aerator
  4.    Sedimentation unit
 Discuss Question
Answer: Option A. -> Primary clarifier
Answer: (a).Primary clarifier
Question 73. The surface area of facultative ponds should be small.
  1.    True
  2.    False
  3.    May be True or False
  4.    Can't say
 Discuss Question
Answer: Option B. -> False
Answer: (b).False
Question 74. ______ occur when the rate of oxygen transfer from the lagoon surface is less than the rate of oxygen consumption in the lower levels of the lagoon.
  1.    Temperature rise
  2.    Objectionable odour
  3.    Raised pH
  4.    Temperature fall
 Discuss Question
Answer: Option B. -> Objectionable odour
Answer: (b).Objectionable odour
Question 75. In facultative ponds, micro-organisms are able to oxidize only dissolved organics.
  1.    True
  2.    False
  3.    May be True or False
  4.    Can't say
 Discuss Question
Answer: Option B. -> False
Answer: (b).False
Question 76. How is mixing done in SBR?
  1.    Manual
  2.    Mechanical
  3.    Air stripping
  4.    Agitation by air
 Discuss Question
Answer: Option B. -> Mechanical
Answer: (b).Mechanical
Question 77. In which stage are the aeration and mixing avoided?
  1.    First
  2.    Second
  3.    Third
  4.    Fourth
 Discuss Question
Answer: Option C. -> Third
Answer: (c).Third
Question 78. ______ is used to remove phosphorus compounds from the liquor.
  1.    Aluminium nitrate
  2.    Aluminium phosphate
  3.    Aluminium sulphate
  4.    Sodium nitrate
 Discuss Question
Answer: Option C. -> Aluminium sulphate
Answer: (c).Aluminium sulphate
Question 79. The multiplication of _________ is encouraged by the addition of oxygen.
  1.    Bacteria
  2.    Aerobic bacteria
  3.    Anaerobic bacteria
  4.    Fungi
 Discuss Question
Answer: Option B. -> Aerobic bacteria
Answer: (b).Aerobic bacteria
Question 80. In which stage of the SBR is aeration performed?
  1.    First
  2.    Second
  3.    Third
  4.    fourth
 Discuss Question
Answer: Option B. -> Second
Answer: (b).Second

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