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Waste Water Engineering

Waste Water Engineering
The sewer which resists sulphide corrosion, is

Cast iron sewer
R.C. sewer
Lead sewer
Brick sewer

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Waste Water Engineering
The detention period for plain sedimentation water tanks, is usually

4 to 8 hours
24 to 36 hours
16 to 24 hours
8 to 16 hours

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Waste Water Engineering
A drop manhole is provided if

A lamp is inserted to check obstruction
None of these
A sewer drops from a height
A branch sewer joins the main sewer at higher level

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Waste Water Engineering
In a sedimentation tank (length L, width B, depth D) the settling velocity of a particle for a discharge Q, is

Q/(B × L)
Q/(L × D)
Q/L
Q/(B × D)

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Waste Water Engineering
To maintain aerobic biological activity, the moisture content of the compost mass should be about

0.6
0.45
0.55
0.5

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Waste Water Engineering
If the diameter of a sewer is 100 mm, the gradient required for generating self cleansing velocity is

1 in 120
1 in 60
1 in 100
None of these

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