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Waste Water Engineering

Waste Water Engineering
The maximum diameter of sewers adopted in the designs is

3.0 m
2.0 m
4.0 m
1.0 m

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Waste Water Engineering
The normal value of over flow rates for plain primary sedimentation tanks, ranges between

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

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Waste Water Engineering
The arrangement made for passing the sewer line below an obstruction below the hydraulic gradient lines called

Depressed sewer
all of these
Sag pipe
Inverted syphon

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Waste Water Engineering
Which one of the following gases is most significant as air pollutant?

Sulphur-dioxide
Nitrogen
Oxygen
Carbondioxide

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Waste Water Engineering
For design of sewers, percentage of sewage discharge is assumed

65 to 70%
75 to 80%
70 to 75%
0.85

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Waste Water Engineering
If the flame of a miner’s safety lamp in a manhole extinguishes within 5 minutes, the sewer certainly contains

Oxygen
Hydrogen sulphide
Carbon dioxide
Methane

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