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MCQs

Total Questions : 1556 | Page 20 of 156 pages
Question 191. Design period of 40 to 50 years is adopted for
  1.    Branch sewers
  2.    Main sewers
  3.    Trunk sewers
  4.    All the above
 Discuss Question
Answer: Option D. -> All the above
Question 192. The rate of accumulation of sludge per person per year, is
  1.    10 litres
  2.    15 litres
  3.    20 litres
  4.    25 litres
 Discuss Question
Answer: Option C. -> 20 litres
Question 193. Setting out the alignments of sewers may start from
  1.    City
  2.    Out-fall
  3.    Tail end
  4.    Any point
 Discuss Question
Answer: Option C. -> Tail end
Question 194. The sewage discharge in a detritus tank of a treatment plant is 576 litres/sec with flow velocity of 0.2 m/sec. If the ratio of width to depth is 2, the depth is
  1.    100 cm
  2.    110 cm
  3.    120 cm
  4.    150 cm
 Discuss Question
Answer: Option C. -> 120 cm
Question 195. To maintain aerobic biological activity, the moisture content of the compost mass should be about
  1.    45 %
  2.    50 %
  3.    55 %
  4.    60 %
 Discuss Question
Answer: Option C. -> 55 %
Question 196. A safety lamp when inserted in the upper portion of a manhole causes flames. It indicates the presence of
  1.    Carbondioxide gas
  2.    Hydrogen sulphide gas
  3.    Methane gas
  4.    Petrol vapours
 Discuss Question
Answer: Option C. -> Methane gas
Question 197. Pick up the incorrect statement from the following for allowing workers to enter sewers
  1.    The particular manhole and one manhole on upstream and one manhole on downstream should remain open for 30 minutes
  2.    Proper tests for the presence of poisonous gases must be carried out
  3.    The men entering the manhole should be advised to smoke in the sewer
  4.    Warning signals should be erected
 Discuss Question
Answer: Option C. -> The men entering the manhole should be advised to smoke in the sewer
Question 198. Imhoff cone is used to measure
  1.    Total organic solids
  2.    Total solids
  3.    Total in organic solids
  4.    Settleable solids
 Discuss Question
Answer: Option D. -> Settleable solids
Question 199. The normal values of over flow rates for secondary sedimentation tanks, ranges between
  1.    25,000 to 35,000 litres/sqm/day
  2.    40,000 to 50,000 litres/sqm/day
  3.    50,000 to 60,000 litres/sqm/day
  4.    80,000 to 10,000 litres/sqm/day
 Discuss Question
Answer: Option A. -> 25,000 to 35,000 litres/sqm/day
Question 200. The normal value of over flow rates for plain primary sedimentation tanks, ranges between
  1.    25,000 to 35,000 litres/sqm/day
  2.    40,000 to 50,000 litres/sqm/day
  3.    50,000 to 60,000 litres/sqm/day
  4.    80,000 to 100,000 litres/sqm/day
 Discuss Question
Answer: Option B. -> 40,000 to 50,000 litres/sqm/day

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