Water Supply Engineering

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

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

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

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

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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

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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

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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

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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

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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

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18. Acidity in water is caused due to

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

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19. Aeration of water is done to remove

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

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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

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