Waste Water Engineering

241. The ratio of depths at partial flo

1. 1 - sin α/β
2. 1 - cos α/2
3. ½ (1 - cos α/2)
4. ½ (1 - sin α/2)

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242. The ratio of design discharge to the surface area of a sedimentation tank is called

1. Surface loading
2. Overflow rate
3. Overflow velocity
4. All of these

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243. The ratio of maximum sewage flow to average sewage flow for mains up to 1 m in diameter, is

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

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244. The ratio of maximum sewage flow to average sewage flow for trunk mains having diameters more than 1.25 m, is

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

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245. The ratio of minimum hourly flow to the average flow of sewage is

1. 43556
2. 43525
3. 43497
4. 43558

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246. The ratio of the diameter of a circular section and the side of a square section hydraulically equivalent, is

1. 1.095
2. 1.085
3. 1.075
4. 1.065

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247. The rational formula for peak drainage discharge, was evolved by

1. Fruhling
2. Lloyd David
3. Kuichling
4. All of these

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248. The recommended detention period for grit chambers is

1. 1 minute
2. 2 minutes
3. 3 minutes
4. 5 minutes

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249. The reduced levels of the string at the consecutive sight rails A and B are 203.575 m, 203.475 m respectively. If the difference of their R.D.s is 10 m, the gradient of the sewer line is

1. 1 in 100 upward
2. 1 in 500 upward
3. 1 in 100 downward
4. 1 in 503 upward

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250. The screens are fixed

1. Perpendicular to the direction of flow
2. Parallel to the direction of flow
3. At an angle 30° to 60° to the direction of flow
4. None of these

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