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Waste Water Engineering

Waste Water Engineering
The layers of vegetable wastes and night soil alternatively piled above the ground to form a mound, is called

A heap
Windrow
Plateau
None of these

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Waste Water Engineering
Pick up the incorrect size of stone ware sewers

None of these
67.5 cm
52.5 cm
82.5 cm

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

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Waste Water Engineering
A drop manhole is provided if

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

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Waste Water Engineering
The settling velocity of a spherical particle of diameter less than 0.1 mm as per Stock’s law, is

Vs = 418 (Gs – Gw)d² [(3T + 70)/100]
Vs = 418 (Gs – Gw) d [(3T + 70)/100]
Vs = 218 (Gs – Gw)d² [(3T + 70)/100]
Vs = 218 (Gs – Gw)d [(3T + 70)/100]

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Waste Water Engineering
In trickling filter, B.O.D. is reduced to

40 to 60%
80 to 90%
60 to 80%
30 to 40%

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