Water Supply Engineering

101. If average volume of sediment deposits is one-tenth million cubic metres per year in a reservoir of total capacity 10 million cubic metres, the dead storage will be filled up, in

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

Correct answer: (D)
25 years

102. If d is the diameter of the pipe, p is the total internal pressure, f is the permissible tensile stress and n is the effective of the joint, the thickness t of metal pipe, is

  1. n (pd/2f)
  2. (1/n) (pd/2f)
  3. (1/n) (pd/3f)
  4. (1/n) (pf/d)

Correct answer: (B)
(1/n) (pd/2f)

103. If discharge of a pump is 0.16 cumecs, the economic diameter of pipe, is

  1. 0.488 m
  2. 4.88 cm
  3. 48.8 cm
  4. 4.88 m

Correct answer: (A)
0.488 m

104. If four fires break out in a city of population 40 lakhs and if each hydrant has three streams and duration of each fire is four hours, the total quantity of water required, is

  1. 1880 kilo litres
  2. 2880 kilo litres
  3. 3880 kilo litres
  4. 4880 kilo litres

Correct answer: (B)
2880 kilo litres

105. If G is the specific gravity of particles of diameter d, the velocity of settlement V in still water at T°C, according to Stoke's law, is

  1. V = 418 (G - 1) d2 [(3T + 70)/100]
  2. V = 418 (G - 1) d [(3T - 70)/100]
  3. V = 418 (G - 1) d2 [(2T + 70)/100]
  4. V = 418 (G - 1) d4 [(3T + 70)/100]

Correct answer: (A)
V = 418 (G - 1) d2 [(3T + 70)/100]

106. If intensity of rainfall in cm per hour is I, percentage coefficient of run-off is P, area of catchment in square kilometres is A, the total run-off Q, is given by

  1. Q = 1.758 × 102 × API
  2. Q = 2.758 × 102 × API
  3. Q = 2.758 × 103 × API
  4. Q = 2.758 × 103 × A/PI

Correct answer: (C)
Q = 2.758 × 103 × API

107. If L, B and D length, breadth and depth of water in a rectangular sedimentation tank of total discharge Q, the settling velocity, is

  1. Q/H
  2. Q/D
  3. Q/(D × B)
  4. Q/(L × B)

Correct answer: (D)
Q/(L × B)

108. If n is porosity, y is specific yield and r is specific retention of any soil, the relationship which holds good, is

  1. n + y + r = 1
  2. n + y = r
  3. n + r = y
  4. y + r = n

Correct answer: (D)
y + r = n

109. If P is population of a city in thousands and Q is fire demand in litres per minute, for proper estimate of water, the Empirical formula Q = 1135 [(P/5) + 10] is suggested by

  1. National Board of fire under-writers
  2. Freeman
  3. Kuichling
  4. None of these

Correct answer: (B)
Freeman

110. If p is total internal pressure, d is diameter of pressure conduit and t is thickness of conduit, the Hoop's stress is

  1. πdp/t
  2. πdp/2t
  3. dp/2t
  4. dt/2p

Correct answer: (C)
dp/2t

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