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Waste Water Engineering

Waste Water Engineering
In R.C. sewer pipes, the percentage longitudinal reinforcement to the cross-sectional area of concrete is kept

5
10
0.25
2

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Waste Water Engineering
To prevent settling down of sewage both at the bottom and on the sides of a large sewer, self-cleaning velocity recommended for Indian conditions, is

0.70 m/sec
0.50 m/sec
0.60 m/sec
0.75 m/sec

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Waste Water Engineering
Which one of the following gases is most significant as air pollutant?

Nitrogen
Carbondioxide
Oxygen
Sulphur-dioxide

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Waste Water Engineering
A sewer running partially full and hurried with back filled, fails in compression due to

Weight of the pipe
Superimposed traffic loads
Weight of the back fill
All listed here

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Waste Water Engineering
Fresh sewage may become stale in

Three to four hours
Six hours
One hour
Two to three hours

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Waste Water Engineering
For trunk sewers more than 1.25 m in diameter, the ratio of the maximum daily sewage flow to the average daily sewage flow is assumed

2
3
2.5
1.5

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