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Waste Water Engineering

Waste Water Engineering
If the pH value of sewage is 7

It is neutral
It is alkaline
It is acidic
None of these

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Waste Water Engineering
R.M.O. expenses include

All of these
Running expenses
Operation expenses
Maintenance expenses

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Waste Water Engineering
The value of Chezy’s constant C = 157.6/(1.81 + K/ ) is used in

Bazin’s formula
Kutter’s formula
Manning’s formula
Chezy’s formula

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

Oxidation
Screening
Sedimentation
All listed here

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Waste Water Engineering
For efficient working of a sewer, it must be ensured that

Both (A) and (B)
A maximum velocity of 0.90 m/sec, is maintained at its maximum flow
Minimum velocity of 0.45 m/sec, is maintained at its minimum flow
Neither (A) nor (B)

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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 60
1 in 120
None of these
1 in 100

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