Sedimentation Tank MCQ – Environmental Engineering

21. The detention time for an ordinary plain sedimentation tank is

  1. 6 to 8 hours
  2. 20 to 24 hours
  3. 1 to 2 hours
  4. 2 to 4 hours
Answer. a

22. If the temperature of a sedimentation tank is increased, the sedimentation speed will

  1. get hastened
  2. get slowed down
  3. not be affected at all
  4. none of the above
Answer. a

23. The length of rectangular sedimentation tank should not be more than

  1. 2B
  2. B
  3. 8B
  4. 4B
Answer. d

24. The efficiency of a sedimentation tank should not depend upon

  1. depth of the tank
  2. detention time
  3. length of the tank
  4. horizontal velocity of water
Answer. a

25. For a given discharge, the efficiency of sedimentation tank can be increased by

  1. increase the depth of tank
  2. decrease the depth of tank
  3. increasing the surface area of tank
  4. decreasing the surface area of tank
Answer. c

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