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Waste Water Engineering

Waste Water Engineering
In sewage having fully oxidised organic matter, the nitrogen exists in the form of

Nitrites
Free ammonia
Nitrates
Aluminoid nitrogen

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Waste Water Engineering
Sewer pipes are designed for maximum discharge with 25% to 33% vacant cross-sectional area for

Unexpected large scale infiltration of stream water
All of these
Under estimates of maximum and average flows
Unexpected increase in the population

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Waste Water Engineering
House connections to the laterals is generally made by

R.C.C.
Glazed stonewares
Cast iron
P.C.C.

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Waste Water Engineering
A manhole is generally provided at each

Bend
Junction
All of these
Change of gradient

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Waste Water Engineering
The settlement velocity of a solid (diameter 0.5 mm, specific gravity 1.75) in water having temperature 10°C, is

313.5 cm/sec
213.5 cm/sec
500 cm/sec
413.5 cm/sec

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Waste Water Engineering
The pH value of fresh sewage is usually

Equal to zero
Less than 7
Equal to 7
More than 7

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