Aerobic activity is maximum in freshly produced sewage at sewer pipes in sewer t

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in freshly produced sewage

Waste Water Engineering problems

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1. For detecting the nitrites in the sewage, the matching colour may be developed by adding
Options
A. Pottassium permanganate
B. Sulphuric acid and napthamine
C. Phenol-di-sulphuric acid pottassium hydroxide
D. None of these.

2. The sewers
Options
A. must be of adequate size to avoid over flow
B. must flow under gravity to full
C. must be laid at least 2 to 3 m deep to collect /water from the basements
D. all the above.

3. Pick up the correct statement from the following :
Options
A. anaerobic bacteria flourish in the absence of oxygen
B. aerobic bacteria flourish in the presence of oxygen
C. facultative bacteria flourish with or without oxygen
D. all the above.

7. If n is the rugosity coefficient, r is the hydraulic depth, s is the bed slope of sewer, the velocity of flow in m/sec may be obtained by the formula evolved by
Options
A. Chezy
B. Manning
C. Bazin
D. Kutter.

8. If the length of overland flow from the critical point to the mouth of drain is 13.58 km and difference in level between the critical point and drain mouth is 10 m, the inlet time is
Options
A. 2 hours
B. 4 hours
C. 6 hours
D. 8 hours.

9. The settlement of a particle in sedimentation tank, is affected by
Options
A. velocity of flow
B. viscosity of water
C. size and shape of solid
D. specific gravity of solid
E. all the above.

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