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MCQs

Total Questions : 76 | Page 1 of 8 pages
Question 1. ________ is treated in activated sludge reactor.
  1.    Pre-treated sludge
  2.    Treated sludge
  3.    Macronutrients
  4.    Micro-organisms
 Discuss Question
Answer: Option A. -> Pre-treated sludge
Answer: (a).Pre-treated sludge
Question 2. Why is the sludge aerated?
  1.    To avoid bacterial growth
  2.    To increase bacterial growth
  3.    To maintain pH
  4.    To maintain temperature
 Discuss Question
Answer: Option B. -> To increase bacterial growth
Answer: (b).To increase bacterial growth
Question 3. After the treatment, the BOD demand ______
  1.    Remains constant
  2.    Decreases
  3.    Increases
  4.    Alters
 Discuss Question
Answer: Option B. -> Decreases
Answer: (b).Decreases
Question 4. Which is the next reactor after activated sludge reactor in the treatment process?
  1.    Flocculation unit
  2.    Aeration unit
  3.    Clarifier
  4.    Disinfection unit
 Discuss Question
Answer: Option C. -> Clarifier
Answer: (c).Clarifier
Question 5. Which type of pump is preferred to remove trickling filter humus?
  1.    Submersible cutter pump
  2.    Non-clog pump
  3.    Vertical turbine pumps
  4.    Diaphragm pump
 Discuss Question
Answer: Option D. -> Diaphragm pump
Answer: (d).Diaphragm pump
Question 6. Which of these is not an alternative to activated sludge treatment systems?
  1.    Stabilization ponds
  2.    Rotating biological reactors
  3.    Trickling filter
  4.    Screening units
 Discuss Question
Answer: Option D. -> Screening units
Answer: (d).Screening units
Question 7. Where is the sludge at the bottom of the clarifier processed to?
  1.    Settling unit
  2.    Aerator
  3.    Flocculation unit
  4.    Disinfection unit
 Discuss Question
Answer: Option B. -> Aerator
Answer: (b).Aerator
Question 8. Which are the three ingredients in activated sludge systems?
  1.    Cells, sewage and oxygen
  2.    Cells, sewage and nitrogen
  3.    Solids, sewage and oxygen
  4.    Solids, water and oxygen
 Discuss Question
Answer: Option A. -> Cells, sewage and oxygen
Answer: (a).Cells, sewage and oxygen
Question 9. How is air pumped in the aerator unit?
  1.    Bubbled from bottom
  2.    Sides
  3.    Bubbled from top
  4.    Sprayed
 Discuss Question
Answer: Option A. -> Bubbled from bottom
Answer: (a).Bubbled from bottom
Question 10. An activated sludge system consists of two components, an aerator and ________
  1.    Screening units
  2.    Disinfection unit
  3.    Flocculation unit
  4.    Clarifier
 Discuss Question
Answer: Option D. -> Clarifier
Answer: (d).Clarifier

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