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Waste Water Engineering

Waste Water Engineering
In sewage, the solids in mg per litre is

100 to 500
500 to 1000
1000 to 1500
1500 to 2000

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Waste Water Engineering
3.0 ml of raw sewage is diluted to 300 ml. The D.O. concentration of the diluted sample at the beginning of the test was 8 mg/l. After 5 day-incubation at 20°C, the D.O. concentration was 5 mg/l. The BOD of raw sewerage is

300 mg/l
200 mg/l
400 mg/l
100 mg/l

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Waste Water Engineering
The gradient of sewers depends upon

All listed here
Velocity of flow
Diameter of the sewer
Discharge

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Waste Water Engineering
A sewer pipe contains 1 mm sand particles of specific gravity 2.65 and 5 mm organic particles of specific gravity 1.2, the minimum velocity required for removing the sewerage, is

0.30 m/sec
0.35 m/sec
0.45 m/sec
0.40 m/sec

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Waste Water Engineering
Which one of the following resists hydrogen sulphide corrosion?

Asbestos cement
Glazed ware
Glazed stone wares
R.C.C.

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

Rectangular
Circular
Parabolic
New egged

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