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Waste Water Engineering

Waste Water Engineering
Pathogens (or pathogenic bacterias) in water may cause

Typhoid
Dysentery
All listed here
Cholera

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Waste Water Engineering
For a grit chamber, if the recommended velocity of flow is 0.2 m/sec and detention period is 2 minutes, the length of the tank, is

16 m
20 m
30 m
24 m

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Waste Water Engineering
Water content of sewage is about

0.9
0.99
0.999
0.95

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Waste Water Engineering
Removal of oil and grease from sewage, is known

Filtration
Skimming
None of these
Screening

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Waste Water Engineering
A safety lamp when inserted in the upper portion of a manhole causes flames. It indicates the presence of

Petrol vapours
Hydrogen sulphide gas
Carbondioxide gas
Methane gas

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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

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

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