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Waste Water Engineering

Waste Water Engineering
In Chezy’s formula V = C rs for calculating the velocity of flow in circular sewer of diameter running full, the value of hydraulic mean radius is

D/3
D/2
D/4
D/1

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Waste Water Engineering
Depletion of ozone layer in the outer atmosphere may cause

Bronchitis
Skin cancer
Lung cancer
Heart disorder

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Waste Water Engineering
The density of population over 40 hectares is 250/hectare. If water supply demand per day is 200 litres and sewage discharge is 80% of water supply, the sewage flow in sewers of separate system, is

0.05554 cumec
0.0556 cumec
0.05556 cumec
0.05552 cumec

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Waste Water Engineering
If the depletion of oxygen is found to be 5 ppm after incubating a 2.5% solution of sewage sample for 5 days at 21°C, B.O.D. of the sewage is

100 ppm
50 ppm
150 ppm
200 ppm

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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

2 hours
6 hours
8 hours
4 hours

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Waste Water Engineering
The sewage is pumped up

From flat areas
From low lying areas
From basements
All listed here

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