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MCQs

Total Questions : 135 | Page 3 of 14 pages
Question 21. What does MLSS stand for?
  1.    Mixed Liquor Soluble Solvents
  2.    Mixed Liquor Suspended solids
  3.    Mixed Liquor Suspended Solvents
  4.    Major Liquid Soluble Solids
 Discuss Question
Answer: Option B. -> Mixed Liquor Suspended solids
Answer: (b).Mixed Liquor Suspended solids
Question 22. Radial tube header is designed to remove _______
  1.    Suspended solids
  2.    Backwash water
  3.    Settled solids
  4.    Floating matter
 Discuss Question
Answer: Option C. -> Settled solids
Answer: (c).Settled solids
Question 23. Hindered zone settling refers to the suspensions of intermediate concentration.
  1.    True
  2.    False
  3.    May be True or False
  4.    Can't say
 Discuss Question
Answer: Option A. -> True
Answer: (a).True
Question 24. The liquid tends to move up through the interstices of contacting particles because of _______
  1.    High turbidity
  2.    Low turbidity
  3.    High concentration of particles
  4.    Low concentration of particles
 Discuss Question
Answer: Option C. -> High concentration of particles
Answer: (c).High concentration of particles
Question 25. Orifice placement is critical to the successful operation of the clarifier.
  1.    True
  2.    False
  3.    May be True or False
  4.    Can't say
 Discuss Question
Answer: Option A. -> True
Answer: (a).True
Question 26. Even by high-rate of backwash, efficiency of cleaning is poor.
  1.    True
  2.    False
  3.    May be True or False
  4.    Can't say
 Discuss Question
Answer: Option A. -> True
Answer: (a).True
Question 27. What is the depth of washing during high-rate water backwash?
  1.    3-4 mm
  2.    3-6 mm
  3.    2-3 mm
  4.    1-2 mm
 Discuss Question
Answer: Option B. -> 3-6 mm
Answer: (b).3-6 mm
Question 28. What is the air scour rate which is provided before a water backwash?
  1.    12 cum/ sqm h
  2.    15 cum/ sqm h
  3.    20 cum/ sqm h
  4.    27 cum/ sqm h
 Discuss Question
Answer: Option D. -> 27 cum/ sqm h
Answer: (d).27 cum/ sqm h
Question 29. What does sand filter remove?
  1.    TDS
  2.    TSS
  3.    BOD
  4.    COD
 Discuss Question
Answer: Option B. -> TSS
Answer: (b).TSS
Question 30. What is the TSS at the outlet of the Pressure Sand Filter (PSF)?
  1.    <10 ppm
  2.    25 ppm
  3.    100 ppm
  4.    >150 ppm
 Discuss Question
Answer: Option A. -> <10 ppm
Answer: (a).<10 ppm

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