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MCQs

Total Questions : 103 | Page 2 of 11 pages
Question 11. Iron precipitation occurs at which pH?
  1.    1-3
  2.    3-5
  3.    5-7
  4.    7-9
 Discuss Question
Answer: Option D. -> 7-9
Answer: (d).7-9
Question 12. What is the one disadvantage of adding chemicals to bring about precipitation?
  1.    The TSS increases
  2.    The TDS increases
  3.    BOD increases
  4.    It imparts colour
 Discuss Question
Answer: Option B. -> The TDS increases
Answer: (b).The TDS increases
Question 13. Out of these which is not used as a chemical coagulant?
  1.    Alum
  2.    Calcium chloride
  3.    Ferric Chloride
  4.    Poly Iron Chloride
 Discuss Question
Answer: Option D. -> Poly Iron Chloride
Answer: (d).Poly Iron Chloride
Question 14. Along with ferrous sulphate what other chemical is added in order to bring about precipitation?
  1.    Alum
  2.    PAC
  3.    Lime
  4.    Polyelectrolyte
 Discuss Question
Answer: Option C. -> Lime
Answer: (c).Lime
Question 15. When alum is added to the waste water containing calcium ions which compound is formed as a precipitate?
  1.    Al(OH)₃
  2.    Al₂(SO₄)₃
  3.    Ca(OH)₂
  4.    CaCO₃
 Discuss Question
Answer: Option A. -> Al(OH)₃
Answer: (a).Al(OH)₃
Question 16. Calculate the dosage rate for the following data.
Flow rate: 2200m³/hr
Dosage: 100 ppm
  1.    200 Kg/hr
  2.    400 Kg/hr
  3.    220 Kg/hr
  4.    440 Kg/hr
 Discuss Question
Answer: Option C. -> 220 Kg/hr
Answer: (c).220 Kg/hr
Question 17. Determine the size of a flash mixer for the following data. Round off to the nearest digit.
Flow rate: 2200 m³/hr
  1.    37 m³
  2.    73 m³
  3.    367 m³
  4.    183 m³
 Discuss Question
Answer: Option A. -> 37 m³
Answer: (a).37 m³
Question 18. Calculate the volume of lime to be dosed for the below given data. Round it off to the nearest digit.
Flow rate: 2200m³/hr
Dosage: 25 ppm
Specific gravity: 1.12
Concentration: 10%
  1.    491 lph
  2.    450 lph
  3.    475 lph
  4.    400 lph
 Discuss Question
Answer: Option A. -> 491 lph
Answer: (a).491 lph
Question 19. Calculate the size of the tank for the below given data. Round off to the nearest 1000 digit.
Flow rate: 440lph
Retention time: 17 hrs
  1.    9000 L
  2.    8000 L
  3.    10000 L
  4.    7000 L
 Discuss Question
Answer: Option A. -> 9000 L
Answer: (a).9000 L
Question 20. What is the detention time assumed while designing a flash mixer?
  1.    2 mins
  2.    10 mins
  3.    >10 mins
  4.    1min
 Discuss Question
Answer: Option D. -> 1min
Answer: (d).1min

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