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Waste Water Engineering

Waste Water Engineering
The minimum diameter of a sewer is kept

15 cm
25 cm
10 cm
20 cm

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Waste Water Engineering
The width of a settling tank with 2 hour detention period for treating sewage 378 cu m per hour, is

5 m
5.5 m
6.5 m
7 m

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Waste Water Engineering
Sewer pipes need be checked for

Minimum flow
Maximum flow
None of these
Both A and B

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Waste Water Engineering
The small sewers are cleaned by

Flushing
Wooden pills
None of these
Cane rodding

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

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Waste Water Engineering
To test chemical oxygen demand (C.O.D.) of sewage, organic matter is oxidised by potassium dichromate in the presence of

Nitric acid
Sulphuric acid
Hydrochloric acid
Citric acid

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