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Waste Water Engineering

Waste Water Engineering
For laying a sewer line in a trench of 2 m width, an offset line is marked on the ground parallel to the given centre line at a distance of

100 cm
160 cm
140 cm
120 cm

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Waste Water Engineering
Sewer pipes are designed for maximum discharge with 25% to 33% vacant cross-sectional area for

Under estimates of maximum and average flows
Unexpected large scale infiltration of stream water
All of these
Unexpected increase in the population

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Waste Water Engineering
If the flame of a miner’s safety lamp in a manhole extinguishes within 5 minutes, the sewer certainly contains

Methane
Oxygen
Hydrogen sulphide
Carbon dioxide

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Waste Water Engineering
Aerobic activity is maximum

In freshly produced sewage
At sewer pipes
None of these
In sewer treatment plants

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Waste Water Engineering
For the COD test of sewage, organic matter is oxidised by K₂Cr₂O₇ in the presence of

H₂SO₄
HCl
None of these
HNO₃

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Waste Water Engineering
The spacing of man holes along a straight portion of a sewer is 300 m, the diameter of the sewer may be

> 1.5 m
1.5 m
0.9 cm
1.2 m

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