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Waste Water Engineering

Waste Water Engineering
The grit and silt of the grit chambers, may not be used for

Concreting
Neither A nor B
Raising low lying areas by dumping
Both A and B

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Waste Water Engineering
Boussinesq’s equation for ascertaining unit pressure at a depth on sewers due to traffic loads, is

pt = 2H3p/3 Z5
pt = 3H3p/2 Z5
pt = 2H3p/3 Z5
pt = 3H3p/2 Z5

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Waste Water Engineering
The ratio of minimum hourly flow to the average flow of sewage is

43833
43834
43894
43832

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Waste Water Engineering
R.M.O. expenses include

Operation expenses
Running expenses
All of these
Maintenance expenses

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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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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

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

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