Sewers MCQ – Environmental Engineering

16. The flow velocity in sewer does not depend on

  1. its grade
  2. its length
  3. its hydraulic mean depth
  4. its roughness
Answer
Answer. b

17. Sewers are generally laid starting from their

  1. midpoint
  2. outfall point
  3. off-take point
  4. any point along alignment
Answer
Answer. b

18. Sewers should not be designed to run full

  1. to prevent escape of sewage
  2. to prevent scouring of sewer
  3. to facilitate ventilation of sewers
  4. to facilitate cleaning of sewers
Answer
Answer. c

19. The self cleaning velocity for all sewers in India

  1. less than 1 m/s
  2. 1.0 m/s to 1.2 m/s
  3. 3.0 m/s to 3.5 m/s
  4. 1.5 m/s to 2.0 m/s
Answer
Answer. b

20. The gradient required to generate self-cleaning velocity case 150 mm diameter sewer is

  1. 1 in 200
  2. 1 in 300
  3. 1 in 100
  4. 1 in 150
Answer
Answer. c

21. The quantity of liquid waste which flows in sewers during the period of rainfall is known

  1. Sanitary sewage
  2. Industrial waste
  3. Storm sewage
  4. None of these
Answer
Answer. c

22. Which of these sewers are preferred for combined system of sewage?

  1. Egg shaped Sewer
  2. Circular Sewer
  3. Rectangular Sewer
  4. Trapezoidal Sewer
Answer
Answer. a
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