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Waste Water Engineering

Waste Water Engineering
For estimating the peak run off the rational formula Q = 0.0278 KpA was evolved by

All listed here
Lloyd Davis
Frubling
Kinchling

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Waste Water Engineering
Sewer ventilating columns are generally placed at

All listed here
Upper ends of branch sewers
Distances 150 m to 300 m
Every change in the size of sewers

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Waste Water Engineering
3.0 ml of raw sewage is diluted to 300 ml. The D.O. concentration of the diluted sample at the beginning of the test was 8 mg/l. After 5 day-incubation at 20°C, the D.O. concentration was 5 mg/l. The BOD of raw sewerage is

100 mg/l
200 mg/l
300 mg/l
400 mg/l

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Waste Water Engineering
Design period of 40 to 50 years is adopted for

Main sewers
All listed here
Branch sewers
Trunk sewers

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Waste Water Engineering
If 2% solution of a sewage sample is incubated for 5 days at 20°C and depletion of oxygen was found to be 5 ppm, B.O.D. of the sewage is

None of these
225 ppm
250 ppm
200 ppm

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Waste Water Engineering
The maximum depth of sedimentation tanks, is kept

4.5 m
3.5 m
4 m
3 m

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