Water Supply Engineering(Civil Engineering ) Questions and Answers

Question 1. The fire demand of a city may be worked out by
  1.    Kuichling’s formula
  2.    Freeman formula
  3.    Bustan’s formula
  4.    All the above
Explanation:-
Answer: Option D. -> All the above
Question 2. Mathamoglobinemia or blue baby disease is caused due to
  1.    Chlorides
  2.    Nitrites
  3.    Nitrates
  4.    Sulphides
Explanation:-
Answer: Option C. -> Nitrates
Question 3. Acidity in water is caused due to
  1.    Mineral acids
  2.    Free CO2
  3.    Aluminium sulphate
  4.    All the above
Explanation:-
Answer: Option D. -> All the above
Question 4. The specific retention is least in case of
  1.    Clay
  2.    Sand
  3.    Silt
  4.    Coarse gravel.
Explanation:-
Answer: Option D. -> Coarse gravel.
Question 5. Time of concentration
  1.    is the time taken, for precipitation
  2.    duration of rainfall.
  3.    time taken for all the ran off to reach the drain
  4.    time taken for the storm water to travel from the most remote point to the drain.
Explanation:-
Answer: Option D. -> time taken for the storm water to travel from the most remote point to the drain.
Question 6. 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$$\sqrt {\text{Q}} ,$$  the water horse power of the pump is
  1.    400
  2.    450
  3.    500
  4.    600
Explanation:-
Answer: Option D. -> 600
Question 7. Surcharge storage zone of a reservoir, is
  1.    Below dead storage
  2.    Between dead storage and useful storage
  3.    Above useful storage
  4.    Also known as valley storage
Explanation:-
Answer: Option C. -> Above useful storage
Question 8. Surge tanks are used
  1.    for storage water
  2.    to increase the velocity in a pipeline
  3.    as overflow valves
  4.    to guard against water hammer
Explanation:-
Answer: Option D. -> to guard against water hammer
Question 9. Pick up the correct statement from the following:
  1.    Water with hardness up to 75 ppm is considered soft
  2.    Water with hardness more than 200 ppm is considered hard
  3.    Water needed for laundries should contain hardness less than 75 ppm
  4.    All the above
Explanation:-
Answer: Option D. -> All the above
Question 10. The process of passing water through beds of granular materials, is called
  1.    Screening
  2.    Sedimentation
  3.    Filtration
  4.    None of these
Explanation:-
Answer: Option C. -> Filtration
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