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MCQs

Total Questions : 1556 | Page 6 of 156 pages
Question 51. In sewers designed with self cleansing velocity,
  1.    The bottom is silted
  2.    The bottom is scoured
  3.    Both silting and scouring occur at the bottom
  4.    Neither silting nor scouring occurs at the bottom
 Discuss Question
Answer: Option D. -> Neither silting nor scouring occurs at the bottom
Question 52. The sewer that unloads the sewage at the point of treatment is called
  1.    Main sewer
  2.    Outfall sewer
  3.    Branch sewer
  4.    House sewer
 Discuss Question
Answer: Option B. -> Outfall sewer
Question 53. Sewer pipes are designed for maximum discharge with 25% to 33% vacant cross-sectional area for
  1.    Unexpected large scale infiltration of stream water
  2.    Unexpected increase in the population
  3.    Under estimates of maximum and average flows
  4.    All of the above
 Discuss Question
Answer: Option D. -> All of the above
Question 54. In primary sedimentation, the 0.2 mm inorganic solids get separated if specific gravity is
  1.    2.25
  2.    2.50
  3.    2.55
  4.    2.65
 Discuss Question
Answer: Option D. -> 2.65
Question 55. A cylindrical ejector having its height 2 m fills after every 10 minutes with a peak sewage discharge of 0.0157 cumec. The diameter of the ejector chamber, is
  1.    2.30 m
  2.    2.40 m
  3.    2.45 m
  4.    2.50 m
 Discuss Question
Answer: Option C. -> 2.45 m
Question 56. Sewer pipes need be checked for
  1.    Minimum flow
  2.    Maximum flow
  3.    Both A and B
  4.    None of these
 Discuss Question
Answer: Option C. -> Both A and B
Question 57. In the activated sludge process
  1.    Aeration is continued till stability
  2.    Aeration is done with an admixture of previously aerated sludge
  3.    Sludge is activated by constant stirring
  4.    Water is removed by centrifugal action
 Discuss Question
Answer: Option B. -> Aeration is done with an admixture of previously aerated sludge
Question 58. In areas where rainy season is limited to a few months, the type of sewerage system recommended is
  1.    Combined system
  2.    Partially separate system
  3.    Separate system
  4.    None of these
 Discuss Question
Answer: Option C. -> Separate system
Question 59. With self cleansing velocity in sewers
  1.    Silting occurs at bottom
  2.    Scouring occurs at bottom
  3.    Both silting and scouring occur at bottom
  4.    Neither silting nor scouring occurs at bottom
 Discuss Question
Answer: Option D. -> Neither silting nor scouring occurs at bottom
Question 60. For trunk and out-fall, the type of sewers generally used, is
  1.    Standard egg shaped
  2.    Circular shaped
  3.    Horse shoe shaped
  4.    Parabolic shaped
 Discuss Question
Answer: Option C. -> Horse shoe shaped

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