Water Supply Engineering

61. Disinfection of drinking water is done to remove

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

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62. Disinfection of drinking water, is done to remove

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

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63. Disinfection of water with ozone is not good because

1. It vanishes before water reaches the consumers
2. It removes the colour, taste and odour from water as bacterias
3. It adds taste to the water
4. It is more efficient than chlorine in killing bacterias

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64. Dissolved carbon dioxide, can be removed from the supply main by

1. Sedimentation
2. Aeration
3. Chlorination
4. Coagulation

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65. Distribution mains of any water supply, is normally designed for its average daily requirement

1. 1
2. 1.5
3. 2
4. 2.25

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66. Distribution of wash water is provided in

1. Sedimentation tank
2. Slow sand filter
3. Rapid gravity filter
4. All the above

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67. During treatment of water, sedimentation is done

1. Before filtration
2. After filtration
3. Simultaneously with filtration
4. Along with chlorination

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68. Economic height of a dam is the height corresponding to which

1. Cost of the dam per unit of storage is minimum
2. Amount of silting is less
3. Cost of dam per unit storage is maximum
4. Free board provided is least

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69. Efficiency of removing bacterias from raw water by a slow sand filter, is

1. 80% to 81%
2. 85% to 86%
3. 90% to 97%
4. 98% to 99%

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70. Estimates of a water supply project depends upon the rate of water supply per capita consumption and probable population estimated at the end of the design period of

1. 5 to 10 years
2. 10 to 15 years
3. 15 to 20 years
4. 20 to 30 years

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