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Environmental Engineering

Environmental Engineering
Which of the following retards the self purification of stream?

Sunlight
None of these
Satisfying oxygen demand
Higher temperature

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Environmental Engineering
The detention period for oxidation ponds is usually kept as

3 months
48 hours
10 to 15 days
24 hours

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Environmental Engineering
Select the correct relationship between porosity (N), specific yield (y) and specific retention (R)

N = y + R
y = N + R
R > (N + y)
R = N + y

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Environmental Engineering
Sewerage system is usually designed for

27 years
28 years
26 years
25 years

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Environmental Engineering
Standard BOD is measured at

20°C - 5 day
25°C - 3 day
20°C - 1 day
30°C - 5 day

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Environmental Engineering
The gas from sludge digestion tank is mainly composed of

Carbon dioxide
Methane
Hydrogen sulphide
Nitrogen

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