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Waste Water Engineering

Waste Water Engineering
Bottom openings 15 cm × 15 cm in the standing baffle wall are provided

15 cm c/c
50 cm c/c
30 cm c/c
22.5 cm c/c

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Waste Water Engineering
If the length of overland flow from the critical point to the mouth of drain is 13.58 km and difference in level between the critical point and drain mouth is 10 m, the inlet time is

6 hours
8 hours
4 hours
2 hours

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Waste Water Engineering
The maximum spacing of manholes specified by Indian standard in sewers upto 0.3 m diameter is

45 m
20 m
75 m
30 m

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Waste Water Engineering
In a residential colony, sewers of diameters 100 mm, 150 mm and 225 mm were laid with a gradient 1 in 120. Which portion of the sewage system does not choke in due course of time?

100 mm dia
225 mm dia
150 mm dia
All of these

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

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

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Waste Water Engineering
The detention time (t) of a settling tank, may be defined as the time required for

A particle to travel along its length
A particle to travel from top surface to bottom sludge zone
None of these
The flow of sewage to fill the tank

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