Water Supply Engineering

21. Air inlet valve in water mains, is generally provided at

  1. Summit of the pipe
  2. Upstream of sluice valve
  3. Downstream of sluice valve
  4. Both (a) and (c) of above

Correct answer: (D)
Both (a) and (c) of above

22. Air valves are generally provided in pressure pipes of water supply

  1. At pipe junctions
  2. At summits
  3. At low points
  4. Near service pipes

Correct answer: (B)
At summits

23. Alkalinity in water may be caused due to

  1. Calcium and magnesium bicarbonates
  2. Sodium carbonate
  3. Potassium carbonate
  4. All the above

Correct answer: (D)
All the above

24. Alum is a

  1. Coagulant
  2. Flocculent
  3. Catalyst
  4. Disinfectant

Correct answer: (A)
Coagulant

25. Alum is chemically

  1. Copper sulphate
  2. Aluminium sulphate
  3. Ferrous sulphate
  4. Ferric sulphate

Correct answer: (B)
Aluminium sulphate

26. An aquiclude is

  1. A non artesian aquifer
  2. An artesian aquifer
  3. A confined bed of impervious material between aquifers
  4. A large water body underground

Correct answer: (C)
A confined bed of impervious material between aquifers

27. An area is declared drought affected if its mean rainfall is less than

  1. 0.5
  2. 0.6
  3. 0.75
  4. 0.85

Correct answer: (D)
0.85

28. An earth formation which, although porous and capable of absorbing water does not provide an appreciable supply to wells, is known as

  1. Aquifer
  2. Aquiclude
  3. Aquifuge
  4. None of these

Correct answer: (B)
Aquiclude

29. An ideal sand for filters should be

  1. Free from dirt and other impurities
  2. Uniform in nature and size
  3. Hard and resistant
  4. All the above

Correct answer: (D)
All the above

30. Aqueducts are generally designed

  1. Circular
  2. Rectangular
  3. Horse shoe section
  4. All the above

Correct answer: (D)
All the above

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