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MCQs

Total Questions : 76 | Page 2 of 8 pages
Question 11. Biological process is used to remove _______
  1.    Settleable solids
  2.    Volatile solids
  3.    Dissolved solids
  4.    Colloids
 Discuss Question
Answer: Option C. -> Dissolved solids
Answer: (c).Dissolved solids
Question 12. What is the percentage removal of BOD by stabilization ponds?
  1.    20%
  2.    45%
  3.    65%
  4.    95%
 Discuss Question
Answer: Option C. -> 65%
Answer: (c).65%
Question 13. What is the monthly concentration of solids produced by secondary sewage effluent?
  1.    20 mg/l
  2.    30 mg/l
  3.    40 mg/l
  4.    35 mg/l
 Discuss Question
Answer: Option B. -> 30 mg/l
Answer: (b).30 mg/l
Question 14. What is the wastewater called as after physical and biological removal of solids?
  1.    Primary effluent
  2.    Primary treated water
  3.    Secondary treated water
  4.    Secondary treated wastewater
 Discuss Question
Answer: Option D. -> Secondary treated wastewater
Answer: (d).Secondary treated wastewater
Question 15. What is the expected BOD removal after both primary and secondary treatment?
  1.    90%
  2.    85%
  3.    80%
  4.    75%
 Discuss Question
Answer: Option B. -> 85%
Answer: (b).85%
Question 16. Calculate the BOD load for the following data.
Flow: 800 m³/d
BOD load: 1000 mg/L
  1.    1000 kg/d
  2.    800 kg/d
  3.    500 kg/d
  4.    1500 kg/d
 Discuss Question
Answer: Option B. -> 800 kg/d
Answer: (b).800 kg/d
Question 17. Aeration consumes less energy in activated sludge process compared to other processes.
  1.    True
  2.    False
  3.    May be True or False
  4.    Can't say
 Discuss Question
Answer: Option B. -> False
Answer: (b).False
Question 18. What is the symbol used to define the ratio of the process to clean water mass transfer?
  1.    Alpha
  2.    Beta
  3.    Gamma
  4.    Sigma
 Discuss Question
Answer: Option A. -> Alpha
Answer: (a).Alpha
Question 19. What does OTR stand for?
  1.    Oxygen transfer rate in standard conditions
  2.    Oxygen transfer rate in clean water
  3.    Oxygen transfer efficiency in clean water
  4.    Oxygen transfer efficiency in standard conditions in the clean water
 Discuss Question
Answer: Option B. -> Oxygen transfer rate in clean water
Answer: (b).Oxygen transfer rate in clean water
Question 20. Which of the following is not a standard condition for aeration?
  1.    40˚C
  2.    1 atm
  3.    Zero salinity
  4.    Zero DO
 Discuss Question
Answer: Option A. -> 40˚C
Answer: (a).40˚C

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