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Waste Water Engineering

Waste Water Engineering
For trunk and out-fall, the type of sewers generally used, is

Circular shaped
Horse shoe shaped
Parabolic shaped
Standard egg shaped

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Waste Water Engineering
Clogging of sewers, is caused due to

Low discharge
Greasy and oily matters
All of these
Silting

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Waste Water Engineering
The first stage of neutral process of sludge digestion, is

Acid regression
Acid fermentation
None of these
Alkaline fermentation

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Waste Water Engineering
For estimating the peak run off the rational formula Q = 0.0278 KpA was evolved by

Lloyd Davis
Kinchling
Frubling
All listed here

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Waste Water Engineering
Cement concrete sewers are only suitable if non-scouring velocity is between

4.5 to 5.5 m/sec
3.0 to 4.0 m/sec
2.5 to 3.0 m/sec
3.5 to 4.5 m/sec

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Waste Water Engineering
A sewer pipe contains 1 mm sand particles of specific gravity 2.65 and 5 mm organic particles of specific gravity 1.2, the minimum velocity required for removing the sewerage, is

0.35 m/sec
0.45 m/sec
0.30 m/sec
0.40 m/sec

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