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Waste Water Engineering

Waste Water Engineering
The ratio of the diameter of a circular section and the side of a square section hydraulically equivalent, is

1.095
1.075
1.085
1.065

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Waste Water Engineering
The reduced levels of the string at the consecutive sight rails A and B are 203.575 m, 203.475 m respectively. If the difference of their R.D.s is 10 m, the gradient of the sewer line is

1 in 503 upward
1 in 100 upward
1 in 100 downward
1 in 500 upward

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Waste Water Engineering
For a grit chamber, if the recommended velocity of flow is 0.2 m/sec and detention period is 2 minutes, the length of the tank, is

20 m
16 m
30 m
24 m

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Waste Water Engineering
A five day B.O.D. at 15°C of the sewage of a town is 100 kg/day. If the 5 day B.O.D. per head at 15°C for standard sewage is 0.1 kg/day, the population equivalent is

10000
100
5000
1000

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Waste Water Engineering
The small sewers are cleaned by

None of these
Cane rodding
Wooden pills
Flushing

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Waste Water Engineering
For detecting the nitrates in sewage, the colour may be developed by adding

None of these
Sulphuric acid and napthamine
Potassium permanganate
Phenol-di -sulphuric acid and potassium hydroxide

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