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Environmental Engineering

Environmental Engineering
The pathogens can be killed by

Nitrification
Chlorination
None of these
Oxidation

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Environmental Engineering
Sewerage system is designed for

Maximum flow only
Maximum and minimum flow
Average flow only
Minimum flow only

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Environmental Engineering
The design discharge for the combined sewer system shall be taken as

Equal to rainfall
Rainfall + 6 DWF
Rainfall + DWF
Rainfall + 2 DWF

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Environmental Engineering
The minimum dissolved oxygen which should always be present in water in order to save the aquatic life is

4 ppm
10 ppm
1 ppm
40 ppm

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Environmental Engineering
The hydraulic mean depth (HMD) for an egg-shaped sewer flowing two-third full is

Greater than HMD when flowing full
Less than HMD when flowing full
None of these
Equal to HMD when flowing full

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Environmental Engineering
Sewerage system is usually designed for

26 years
28 years
27 years
25 years

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