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Waste Water Engineering

Waste Water Engineering
In a city the ratio of the drainage to sewage is 20, the percentage discharge passing through non-monsoon periods, is

5
20
10
15

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Waste Water Engineering
If the diameter of sewer is 225 mm, the gradient required for generating self cleansing velocity, is

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

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

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

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Waste Water Engineering
The minimum diameter of sewer to be adopted is

25 cm
10 cm
15 cm
12.5 cm

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Waste Water Engineering
For non-scouring velocity 5 m/sec, the type of sewers generally preferred to, is

Cast iron sewers
Glazed bricks sewers
Stone ware sewers
Cement concrete sewers

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Waste Water Engineering
hydraulically equivalent, the relationship which holds good, is

D8/3 = 4 b8/3
D3/2 = 4 b3/2
D2/3 = 4 b2/3
D3/8 = 4 b3/8

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