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Environmental Engineering

Environmental Engineering
If Biochemical oxygen demand (BOD) of a town is 20000 kg/day and BOD per capita per day is 0.05 kg, then population equivalent of town is

4,00,000
1000
1,00,000
4000

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Environmental Engineering
The biochemical treatment of sewage effluents is essentially a process of

Reduction
Dehydration
Alkalinization
Oxidation

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Environmental Engineering
The relative stability of a sewage sample, whose dissolved oxygen is same as the total oxygen required to satisfy BOD, is

Zero
1
100
Infinite

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Environmental Engineering
In a BOD test, 1.0 ml of raw sewage was diluted to 100 ml and the dissolved oxygen concentration of diluted sample at the beginning was 6 ppm and it was 4 ppm at the end of 5 day incubation at 20°C. The BOD of raw sewage will be

400 ppm
300 ppm
100 ppm
200 ppm

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Environmental Engineering
The type of valve, which is provided on the suction pipe in a tube-well, is

Reflux valve
Air relief valve
Pressure relief valve
Sluice valve

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Environmental Engineering
An egg shaped section of sewer

Is economical than circular section
Is more stable than circular section
Provides self cleansing velocity at low discharges
Is easy to construct

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