Water Supply Engineering

221. The discharge Q = π2 KHS/2.3 log10 (R/rw) for the confined tube well is obtained from

  1. Thiem's formula
  2. Darcy's formula
  3. Tolman's formula
  4. Dupuits formula

Correct answer: (D)
Dupuits formula

222. The duration of contact of chlorine with water before it is served to the first consumer, should be at least

  1. 10 to 15 minutes
  2. 15 to 20 minutes
  3. 20 to 30 minutes
  4. 30 to 40 minutes

Correct answer: (C)
20 to 30 minutes

223. The efficiency of a pumping set, is generally assumed

  1. 50 %
  2. 55 %
  3. 60 %
  4. 65 %

Correct answer: (D)
65 %

224. The efficiency of sedimentation tank does not depend upon

  1. Depth of tank
  2. Length of tank
  3. Detention period
  4. Velocity of water

Correct answer: (D)
Velocity of water

225. The ensure proper growth of children's teeth, the quantity of fluoride used in water mains, is

  1. 1 mg/litre
  2. 2 mg/litre
  3. 3 mg/litre
  4. 5 mg/litre

Correct answer: (A)
1 mg/litre

226. The equation 0.368 [p/(1.87 + 32)] x (H/√A)0.155 in which Q is yearly run off in cm, P is yearly total rainfall in cm, H is difference of R.L.s. of lowest and highest points and A is area of catchment in square metres, is known as

  1. English formula
  2. Khosla's formula
  3. Justin's formula
  4. Vermule's formula

Correct answer: (C)
Justin's formula

227. The expected discharge to be obtained from an open well sunk in coarse sand is 0.0059 cumec. If the working depression head of the well is 3 m, the minimum diameter of the well, is

  1. 2 m
  2. 2.25 m
  3. 2.50 m
  4. 3.00 m

Correct answer: (D)
3.00 m

228. The external load per unit length of

  1. A pipe laid on, or projecting above the undisturbed ground and covered with fills, is proportional to the square of the external diameter of the pipe
  2. A flexible pipe buried in narrow trenches and thoroughly compacted side fills, is proportional to the product of the width of the trench and diameter of the pipe
  3. A rigid pipe buried in a narrow trenches and thoroughly compacted side fills, is proportional to the square of the width of the trench
  4. All the above

Correct answer: (D)
All the above

229. The factor affecting per capita demand, is

  1. Size of the city
  2. Climatic conditions
  3. Pressure in water mains
  4. All the above

Correct answer: (D)
All the above

230. The factor for the selection of pumping station site, is

  1. Distance of the source of contamination or pollution
  2. Height above the H.F.L. of the river
  3. Future expansion
  4. All the above

Correct answer: (D)
All the above

Previous
Page 23 of 33
Next
Copyright © EngineeringMCQ.com