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Waste Water Engineering

Waste Water Engineering
The porosity of sediments in sewer pipes, is usually taken as

0.013
0.01
0.011
0.012

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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

2.45 m
2.50 m
2.30 m
2.40 m

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Waste Water Engineering
The spacing of bars of perforations of fine screens used for the treatment of sewage, is

5 to 8 mm
2 to 3 mm
8 to 10 mm
3 to 5 mm

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Waste Water Engineering
House connections to the laterals is generally made by

Cast iron
P.C.C.
Glazed stonewares
R.C.C.

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Waste Water Engineering
If the diameter of a sewer is 150 mm, the gradient required for generating self cleansing velocity, is

1 in 100
1 in 60
1 in 120
None of these

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Waste Water Engineering
If the flame of a miner's safety lamp in the upper layers of the sewer forms an explosive, the sewer certainly contains

Oxygen
Methane
Hydrogen sulphide
Carbon dioxide

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