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Waste Water Engineering

Waste Water Engineering
In sewers the effect of scouring is more on

Horizontal side
Bottom side
All sides
Top side

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Waste Water Engineering
Rate of flow of sewage is generally assumed

More than the rate of water supply
Less than the rate of water supply
At 150 litres per capita
Equal to the rate of water supply

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Waste Water Engineering
The most efficient cross-section of sewers in a combined sewerage system is

New egged
Circular
Rectangular
Parabolic

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Waste Water Engineering
A cylindrical ejector having its height 2 m fills after every 10 minutes with a peak sewage discharge of 0.0157 cumec. The diameter of the ejector chamber, is

2.30 m
2.45 m
2.50 m
2.40 m

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Waste Water Engineering
If the depletion of oxygen is found to be 5 ppm after incubating a 2.5% solution of sewage sample for 5 days at 21°C, B.O.D. of the sewage is

150 ppm
50 ppm
200 ppm
100 ppm

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Waste Water Engineering
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 in 503 upward
1 in 500 upward
1 in 100 upward
1 in 100 downward

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