- A. 7.2 mm
- B. 7.9 mm
- C. 8.6 mm
- D. 10 mm
Water Supply Engineering
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The least thickness of class B cast iron (spun) pipe, is_____.
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As per IS : 1172-1963, water required per head per day for average domestic purposes, is_____.
- A. 65 litres
- B. 85 litres
- C. 105 litres
- D. 135 litres
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Biochemical Oxygen Demand (B.O.D.) of safe drinking water must be_____.
- A. nil
- B. 5
- C. 10
- D. 15
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For the prediction of future population of a city, the factor to be considered, is_____.
- A. Births
- B. Deaths
- C. Migrants
- D. All the above
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If the chosen diameter of a pipe, is less than the economical diameter_____.
- A. Cost of pipe will be less
- B. Head loss will be high
- C. Cost of pumping will be more than saving
- D. All the above
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The R.L. of ground water table on the sides of a valley is 1505 m whereas R.L. of the stream water is 1475 m. If 60° slope consists of pervious soil between R.L. 1485 m to 1500 m, the gravity spring may be expected at the point of reduced level_____.
- A. 1500 m
- B. 1505 m
- C. 1475 m
- D. 1485 m
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Time of concentration_____.
- A. is the time taken, for precipitation
- B. duration of rainfall.
- C. time taken for all the ran off to reach the drain
- D. time taken for the storm water to travel from the most remote point to the drain.
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To pump water from a water reservoir 3 m deep and maximum water level at 135 m, a pump is installed to lift water up to R.L. 175 m at a constant rate of 36,00,000 litres per hour. If the length of the pipe is 1506 m and f = 0.01, ignoring other minor losses and assuming the economical diameter from Lea’s formula D = 1.2 √Q, the water horse power of the pump is_____.
- A. 400
- B. 450
- C. 500
- D. 600
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The factor affecting per capita demand, is_____.
- A. size of the city
- B. climatic conditions
- C. cost of water
- D. all the above
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For determining the velocity of flow of underground water, the most commonly used non-empirical formula is_____.
- A. Darcy’s formula
- B. Slichter’s formula
- C. Hazen’s formula
- D. Lacy’s formula