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Waste Water Engineering

Waste Water Engineering
A five day B.O.D. at 15°C of the sewage of a town is 100 kg/day. If the 5 day B.O.D. per head at 15°C for standard sewage is 0.1 kg/day, the population equivalent is

5000
10000
1000
100

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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

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

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Waste Water Engineering
Lead acetate test in sewer manhole is done to test the presence of

Methane gas
Hydrogen sulphide
Diesel vapours
Carbondioxide gas

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Waste Water Engineering
The gas evolved in sewers is

Carbondioxide
Hydrogen sulphide
Methane
All of these

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Waste Water Engineering
In case of Imhoff tanks,

The velocity of flow is restricted to 0.30 m/minute
Detention period is 2 hours
The shape is rectangular
All of these

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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

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

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