Water Supply Engineering

111. If pH value of water is

  1. 7 water it is said to be neutral
  2. Less than 7 it is said to be acidic
  3. More than 7 it is said to be alkaline
  4. All the above

Correct answer: (D)
All the above

112. If Q is discharge is cubic metres per sec and D is the economical diameter of the pipe. According to Lea

  1. D = 0.67 to 0.87 √Q
  2. D = 0.77 to 0.97 √Q
  3. D = 0.97 to 1.22 √Q
  4. D = 1.22 to 1.33 √Q

Correct answer: (C)
D = 0.97 to 1.22 √Q

113. If the average daily demand of a city of 50,000 population, is 20 m.l.d., the maximum daily demand is

  1. 24 mld
  2. 30 mld
  3. 36 mld
  4. 54 mld

Correct answer: (C)
36 mld

114. If the chosen diameter of a pipe, is less than the economical diameter

  1. Cost of pipe will be less
  2. Head loss will be high
  3. Cost of pumping will be more than saving
  4. All the above

Correct answer: (D)
All the above

115. If the specific capacity of a well is 0.3183 × 10-3 per sec, the discharge from a well of 4 m diameter under a depression head of 4 m, is

  1. 8 litres/sec
  2. 10 litres/sec
  3. 12 litres/sec
  4. 16 litres/sec

Correct answer: (D)
16 litres/sec

116. If V is total consumption of water in litres for a population of N individuals, per capita consumption or water allowance for the water supply Q, is given by

  1. Q = V/12N
  2. Q = V/24N
  3. Q = V/265N
  4. None of these

Correct answer: (C)
Q = V/265N

117. If w is the weight of water per cubic metre, Q is the discharge in cubic metres per sec and H is the total head, the required water horse power of the pump, is

  1. wQH/15
  2. wQH/360
  3. wQH/220
  4. wQH/550

Correct answer: (A)
wQH/15

118. In a rapid gravity filter

  1. Raw water from the source is supplied
  2. Disinfected raw water is supplied
  3. Raw water passed through coagulation tank is supplied
  4. None of these

Correct answer: (C)
Raw water passed through coagulation tank is supplied

119. In a rapid sand filter, air binding is caused due to excessive

  1. Negative pressure
  2. Pressure
  3. Turbidity
  4. Water pressure

Correct answer: (A)
Negative pressure

120. In a reservoir the average volume of sediment deposition is 0.15 million cubic per year. If the dead storage and total capacity of the reservoir are 8 million cubic metres and 36 million cubic metres respectively,

  1. The reservoir will theoretically be silted in 240 years
  2. The reservoir will start reducing after 60 years
  3. Both (a) and (b)
  4. Neither (a) nor (b)

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

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