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Waste Water Engineering

Waste Water Engineering
Fresh sewage may become stale in

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

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Waste Water Engineering
Before discharging the foul sewage into rivers, it is generally treated by

Screening
All listed here
Oxidation
Sedimentation

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Waste Water Engineering
For sewer mains of 0.5 to 1 m diameter, the ratio of maximum daily sewage flow to the average daily sewage flow is assumed

1.5
2
3
2.5

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Waste Water Engineering
In sewers the velocity of flow should not be

Less than the self-cleansing velocity
Less than 10 m/sec
More than the self-cleansing velocity
More than 20 m/sec

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Waste Water Engineering
For a peak discharge of 0.0157 cumec, with a velocity of 0.9 m/sec, the diameter of the sewer main, is

15 cm
18 cm
12 cm
10 cm

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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
All listed here
Weight of the back fill

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MORE MCQ ON Waste Water Engineering

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