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Environmental Engineering in CE

Environmental Engineering in CE
The function of skimming tank in sewage treatment is to remove __________ substances.

Oil & fatty
Dissolved solid
Gritty & inorganic
Suspended solid

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Environmental Engineering in CE
Reingleman chart is used for the evaluation of __________ pollution.

Noise
Water
Air
Radioactive

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Environmental Engineering in CE
Presence of soluble organics in polluted water causes

Undesirable plants growth
Explosion hazards
Fire hazards
Depletion of oxygen

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Environmental Engineering in CE
Radioactive substances present in the polluted water stream can be removed by

Coagulation and filtration
Biological oxygen treatment
None of these
Adsorption in ion exchange materials

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Environmental Engineering in CE
The disinfection efficiency of chlorine increases by(i) Decreasing the time of contact(ii) Decreasing the temperature of water(iii) Increasing the temperature of water

Both (i) and (ii)
Only (i)
Both (i) and (iii)
Only (iii)

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Environmental Engineering in CE
The type of bacteria which is active in trickling filter during biological treatment of sewage is the __________ bacteria.

Saphrophytic
Anaerobic
Parasitic
Aerobic

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