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Environmental Engineering

Environmental Engineering
Sewage treatment units are designed for

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

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Environmental Engineering
In water treatment, rapid gravity filters are adopted to remove

Dissolved organic substances
Floating solids and dissolved inorganic solids
Dissolved solids and dissolved gases
Bacteria and colloidal solids

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Environmental Engineering
The self cleansing velocity for all sewers in India is usually

3.0 m/sec to 3.5 m/sec
1.0 m/sec to 1.2 m/sec
Less than 1.0 m/sec
1.5 m/sec to 2.0 m/sec

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Environmental Engineering
The ratio of 5 day BOD to ultimate BOD is about

43894
43864
1
43833

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Environmental Engineering
As compared to geometrical increase method of forecasting population, arithmetical increase method gives

Accurate value
Higher value
Lesser value
Same value

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Environmental Engineering
The characteristics of fresh and septic sewage respectively are

Alkaline and acidic
Both alkaline
Both acidic
Acidic and alkaline

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