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Waste Water Engineering

Waste Water Engineering
The minimum diameter of sewer to be adopted is

15 cm
10 cm
12.5 cm
25 cm

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Waste Water Engineering
A manhole is generally provided at each

All of these
Change of gradient
Junction
Bend

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Waste Water Engineering
For trunk sewers more than 1.25 m in diameter, the ratio of the maximum daily sewage flow to the average daily sewage flow is assumed

3
2
2.5
1.5

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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

Carbondioxide gas
Petrol vapours
Methane gas
Hydrogen sulphide gas

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Waste Water Engineering
The standard B.O.D. of water is taken for

2 days
5 days
1 day
3 days

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Waste Water Engineering
The ratio of minimum hourly flow to the average flow of sewage is

43834
43832
43833
43894

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