Water Supply Engineering

11. A water channel supported above the ground over trestles, is generally called

  1. Flume
  2. Canal
  3. Aqueduct
  4. Tunnel

Correct answer: (A)
Flume

12. A well is considered to be good if it is sunk into

  1. Clay
  2. Sand
  3. Coarse gravel
  4. Silt

Correct answer: (C)
Coarse gravel

13. Abyssinian tube well is a special type of

  1. Slotted type wells
  2. Cavity type wells
  3. Strainer type well
  4. None of these

Correct answer: (C)
Strainer type well

14. According to Buston's formula, fire demand in litres per minute for a population of P thousands, is

  1. 3182 √P
  2. 1136.5 [(P/10) + 10]
  3. 4637 √P (1 - 0.01 √P)
  4. 5663 √P

Correct answer: (D)
5663 √P

15. According to Godrich the ratio of peak demand rate to mean demand is

  1. Max. weekly demand/Average weekly demand = 148%
  2. Max. monthly demand/Average monthly demand = 128%
  3. Max. half yearly demand/Average half yearly demand = 107%
  4. All the above

Correct answer: (D)
All the above

16. According to IS : 1172-1963, a minimum of 135 litres of water capita per day, is required for

  1. Boarding schools
  2. Nurses home and medical quarters
  3. Hostels
  4. All the above

Correct answer: (D)
All the above

17. According to Kuichling's formula, fire demand in liters per minute for a population of P thousands, is

  1. 3182 P√
  2. 1136.5 (P/10 + 10)
  3. 4637 √P [1 - 0.01 √P]
  4. 5663 √P

Correct answer: (A)
3182 P√

18. Acidity in water is caused due to

  1. Mineral acids
  2. Free CO2
  3. Iron sulphate
  4. All the above

Correct answer: (D)
All the above

19. Aeration of water is done to remove

  1. Odour
  2. Colour
  3. Bacterias
  4. Turbidity

Correct answer: (A)
Odour

20. After cleaning a slow sand filter, the filtered water is not used for

  1. 6 hours to 12 hours
  2. 12 hours to 18 hours
  3. 18 hours to 24 hours
  4. 24 hours to 36 hours

Correct answer: (D)
24 hours to 36 hours

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