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Waste Water Engineering

Waste Water Engineering
The rational formula for peak drainage discharge, was evolved by

All of these
Fruhling
Kuichling
Lloyd David

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Waste Water Engineering
If q is the average sewage flow from a city of population P, the maximum sewage flow

Q = [(5 + )/((15 + )] q
Q = [(18 + )/(4 + )] q
Q = [(4 + )/(18 + )] q
Q = [(18 + P)/(4 + )] q

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Waste Water Engineering
The presence of free ammonia in sewage, is detected by

Boiling
Adding potassium permanganate
Phenol-di-sulphuric acid
Adding sulphuric acid

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Waste Water Engineering
For large sewers, maximum distance between manholes may be

300 m
100 m
50 m
200 m

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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
Carbondioxide gas
Methane gas
Hydrogen sulphide gas

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Waste Water Engineering
If the diameter of sewer is 225 mm, the gradient required for generating self cleansing velocity, is

1 in 60
1 in 100
None of these
1 in 120

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