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Waste Water Engineering

Waste Water Engineering
The ratio of maximum sewage flow to average sewage flow for trunk mains having diameters more than 1.25 m, is

2
3
4
1.5

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Waste Water Engineering
Chlorination of water is done for the removal of

Hardness
Suspended solids
Sediments
Bacterias

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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

Methane gas
Hydrogen sulphide gas
Carbondioxide gas
Petrol vapours

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Waste Water Engineering
Drop manholes are the manholes

Without entry ladders
With depths more than 3.5 m
Having drains at different levels
Without manhole covers

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

1.0 m
2.0 m
4.0 m
3.0 m

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Waste Water Engineering
Primary treatment of sewage consists of removal of

Floating materials
Sand and girt
Large suspended organic solids
Oil and grease

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MORE MCQ ON Waste Water Engineering

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