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Waste Water Engineering

Waste Water Engineering
In circular sewers if depth of flow is 0.2 times the full depth, the nominal gradient,

Is only provided
Is not enough
Is trebled
Is doubled

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Waste Water Engineering
If the side of a square sewer is 1000 mm, the diameter of a hydraulically equivalent circular section, is

1095 mm
1065 mm
1075 mm
1045 mm

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Waste Water Engineering
‘Cowl’ is provided at

Upper end of ventilating column
Upper end of the manhole
First step in manhole
Lower end of ventilating column

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Waste Water Engineering
In sewers designed with self cleansing velocity,

Both silting and scouring occur at the bottom
Neither silting nor scouring occurs at the bottom
The bottom is silted
The bottom is scoured

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Waste Water Engineering
For evaporation and measurement of settable solids, the apparatus used, is

An Imhoff cone
A jar
A test tube
A breaker

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Waste Water Engineering
The detention time of a circular tank of diameter d and water depth H, for receiving the sewage Q per hour, is

d (0.022d + 0.085H)/Q
d (0.285d + 0.011H)/Q
d (0.785d + 0.011H)/Q
d² (0.011d + 0.785H)/Q

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