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WASTE WATER ENGINEERING

Waste Water Engineering
If the discharge of a sewer running half is 628 1.p.s., i = 0.001, and n = 0.010, the diameter of the sewer, is

1.69 m
1.49 m
1.39 m
1.59 m

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Waste Water Engineering
Acid regression stage of sludge digestion at a temperature 21°C extends over a period of

60 days
90 days
15 days
30 days

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Waste Water Engineering
For non-scouring velocity 5 m/sec, the type of sewers generally preferred to, is

Cement concrete sewers
Glazed bricks sewers
Cast iron sewers
Stone ware sewers

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Waste Water Engineering
A manhole is generally provided at each

Junction
Bend
All of these
Change of gradient

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Waste Water Engineering
The amount of oxygen consumed by the aerobic bacterias which cause the aerobic biological decomposition of sewage, is known

Dissolved Oxygen (D.O.)
None of these
Chemical Oxygen Demand (C.O.D.)
Bio-Chemical Oxygen Demand (B.O.D.)

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