Waste Water Engineering

271. The small sewers are cleaned by

  1. Flushing
  2. Cane rodding
  3. Wooden pills
  4. None of these

Correct answer: (A)
Flushing

272. The spacing of bars for perforations in coarse screens used for the treatment of sewage, is

  1. 20 mm
  2. 30 mm
  3. 40 mm
  4. 50 mm

Correct answer: (D)
50 mm

273. The spacing of bars of perforations of fine screens used for the treatment of sewage, is

  1. 2 to 3 mm
  2. 3 to 5 mm
  3. 5 to 8 mm
  4. 8 to 10 mm

Correct answer: (A)
2 to 3 mm

274. The spacing of man holes along a straight portion of a sewer is 300 m, the diameter of the sewer may be

  1. 0.9 cm
  2. 1.2 m
  3. 1.5 m
  4. > 1.5 m

Correct answer: (D)
> 1.5 m

275. The standard B.O.D. of water is taken for

  1. 1 day
  2. 2 days
  3. 3 days
  4. 5 days

Correct answer: (D)
5 days

276. The stone ware sewers

  1. Are used for carrying sewage and drainage from houses
  2. Are manufactured from clays and shale
  3. After casting are dried and burnt at temperature 150°C, 700°C and 1200°C
  4. All the above

Correct answer: (D)
All the above

277. The suitable cross-section of sewers to carry combined flow, is

  1. Circular
  2. Egg shaped
  3. Rectangular
  4. Horse shoe shaped

Correct answer: (B)
Egg shaped

278. The temperature affects the

  1. Biological activity of bacteria in sewage
  2. Solubility of gases in sewage
  3. Viscosity of sewage
  4. All the above

Correct answer: (D)
All the above

279. The underground sewers are more subjected to

  1. Tensile force
  2. Compressive force
  3. Bending force
  4. Shearing force

Correct answer: (B)
Compressive force

280. The use of coarse screens for the disposal of sewage, may be dispensed with by

  1. Comminutor
  2. Shredder
  3. Both (a) and (b)
  4. Neither (a) nor (b)

Correct answer: (C)
Both (a) and (b)

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