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MCQs

Total Questions : 1556 | Page 16 of 156 pages
Question 151. Sewer ventilating columns are generally placed at
  1.    Distances 150 m to 300 m
  2.    Upper ends of branch sewers
  3.    Every change in the size of sewers
  4.    All the above
 Discuss Question
Answer: Option D. -> All the above
Question 152. The coagulant which is generally not used for treating the sewage, is
  1.    Alum
  2.    Ferric chloride
  3.    Ferric sulphate
  4.    Chlorinated coppers
 Discuss Question
Answer: Option A. -> Alum
Question 153. Pick up the correct statement from the following:
  1.    Hydrogen sulphide gas in excess, may cause corrosion of concrete sewers
  2.    4 ppm of Dissolved Oxygen (D.O.) is ensured before discharging the treated sewage in river
  3.    Solubility of oxygen in sewage is 95% of that of distilled water
  4.    All the above
 Discuss Question
Answer: Option D. -> All the above
Question 154. Pick up the correct statement from the following:
  1.    In treated sewage, 4 ppm of D.O. is essential
  2.    Only very fresh sewage contains some dissolved oxygen
  3.    The solubility of oxygen in sewage is 95% that is in distilled water
  4.    All the above
 Discuss Question
Answer: Option D. -> All the above
Question 155. For house drainage minimum gradient is
  1.    1 in 60
  2.    1 in 80
  3.    1 in 10
  4.    1 in 400
 Discuss Question
Answer: Option A. -> 1 in 60
Question 156. In circular sewers if depth of flow is 0.2 times the full depth, the nominal gradient,
  1.    Is only provided
  2.    Is doubled
  3.    Is trebled
  4.    Is not enough
 Discuss Question
Answer: Option B. -> Is doubled
Question 157. The liquid wastes from kitchens, bath rooms and wash basins, is not called
  1.    Liquid waste
  2.    Sullage
  3.    Sewage
  4.    None of these
 Discuss Question
Answer: Option C. -> Sewage
Question 158. If the diameter of a sewer is 100 mm, the gradient required for generating self cleansing velocity is
  1.    1 in 60
  2.    1 in 100
  3.    1 in 120
  4.    None of these
 Discuss Question
Answer: Option A. -> 1 in 60
Question 159. Self-cleansing velocity is
  1.    Velocity at dry weather flow
  2.    Velocity of water at flushing
  3.    Velocity at which no accumulation remains in the drains
  4.    Velocity of water in a pressure filter
 Discuss Question
Answer: Option C. -> Velocity at which no accumulation remains in the drains
Question 160. In a city the ratio of the drainage to sewage is 20, the percentage discharge passing through non-monsoon periods, is
  1.    5
  2.    10
  3.    15
  4.    20
 Discuss Question
Answer: Option D. -> 20

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