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Waste Water Engineering

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

90 days
15 days
30 days
60 days

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Waste Water Engineering
If D.O. concentration falls down to zero in any natural drainage, it indicates the zone of

Recovery
Active decomposition
Degradation
Cleaner water

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Waste Water Engineering
For laying a sewer line in a trench of 2 m width, an offset line is marked on the ground parallel to the given centre line at a distance of

100 cm
160 cm
140 cm
120 cm

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Waste Water Engineering
The normal values of over flow rates for sedimentation tanks using coagulant, ranges between

25,000 to 35,000 litres/sqm/day
80,000 to 100,000 litres/sqm/day
50,000 to 60,000 litres/sqm/day
40,000 to 50,000 litres/sqm/day

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

Horse shoe shaped
Standard egg shaped
Circular shaped
Parabolic shaped

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Waste Water Engineering
Boussinesq’s equation for ascertaining unit pressure at a depth on sewers due to traffic loads, is

pt = 3H3p/2 Z5
pt = 2H3p/3 Z5
pt = 3H3p/2 Z5
pt = 2H3p/3 Z5

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MORE MCQ ON Waste Water Engineering

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