Waste Water Engineering

211. The grit chambers of sewage treatment plants, are generally cleaned after

  1. 2 days
  2. 7 days
  3. 12 days
  4. 14 days

Correct answer: (D)
14 days

212. The intensity of rain is expressed in

  1. cm/minute
  2. cm/hour
  3. cm/day
  4. None of these

Correct answer: (B)
cm/hour

213. The layers of vegetable wastes and night soil alternatively piled above the ground to form a mound, is called

  1. A heap
  2. Plateau
  3. Windrow
  4. None of these

Correct answer: (D)
None of these

214. The laying of sewers is done with

  1. Magnetic compass
  2. Theodolite
  3. Level
  4. Clinometer

Correct answer: (C)
Level

215. The liquid wastes from kitchens, bath rooms and wash basins, is not called

  1. Liquid waste
  2. Sullage
  3. Sewage
  4. None of these

Correct answer: (C)
Sewage

216. The maximum depth of sedimentation tanks, is kept

  1. 3 m
  2. 3.5 m
  3. 4 m
  4. 4.5 m

Correct answer: (A)
3 m

217. The maximum diameter of sewers adopted in the designs is

  1. 1.0 m
  2. 2.0 m
  3. 3.0 m
  4. 4.0 m

Correct answer: (C)
3.0 m

218. The maximum spacing of manholes specified by Indian standard in sewers upto 0.3 m diameter is

  1. 20 m
  2. 30 m
  3. 45 m
  4. 75 m

Correct answer: (C)
45 m

219. The minimum diameter of a sewer is kept

  1. 10 cm
  2. 15 cm
  3. 20 cm
  4. 25 cm

Correct answer: (B)
15 cm

220. The minimum diameter of sewer to be adopted is

  1. 10 cm
  2. 12.5 cm
  3. 15 cm
  4. 25 cm

Correct answer: (C)
15 cm

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