Water Supply Engineering

281. The ratio of the maximum daily consumption to the average daily demand, is

1. 1
2. 1.2
3. 1.4
4. 1.8

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282. The ratio of total capacity and dead storage is kept

1. 8
2. 6
3. 4
4. 3

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283. The requirement of water per capita per day, is

1. 90 litres
2. 150 litres
3. 250 litres
4. 400 litres

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284. The specific retention is least in case of

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

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285. The standard B.O.D. at 20°C, is taken for the consumption in

1. 2 days
2. 3 days
3. 4 days
4. 5 days

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286. The storage capacity of a reservoir may be divided into three zones. The lowest zone is

1. Dead storage
2. Useful storage
3. Surcharge storage
4. None of these

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287. The strainer type tube well, is unsuitable for

1. Coarse gravels
2. Fine sandy strata
3. Clean gravels
4. None of these

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288. The superimposed load transmitted to the pipe, is generally evaluated by Business formula

1. pt = 3H³P/2πZ
2. pt = 3H³P/2πZ⁵
3. pt = 3H³P/2πZ²
4. pt = 3H³P²/2πZ³

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289. The temporary hardness of water can be removed by

1. Boiling
2. Adding lime
3. Adding alum
4. Filtration

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290. The total domestic consumption in a city water supply, is assumed

1. 20 %
2. 30 %
3. 40 %
4. 60 %

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