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Environmental Engineering

Environmental Engineering
For satisfactory working of a sludge digestion unit, the pH range of digested sludge should be maintained as

6.5 to 8.0
10.5 to 12.0
4.5 to 6.0
8.5 to 10.0

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Environmental Engineering
The rate of Alteration of pressure filters is

Equal to that of slow sand filters
In between the filtration rate of slow sand filters and rapid sand filters
Greater than that of rapid sand filters
Less than that of slow sand filters

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Environmental Engineering
The hydraulic mean depth (HMD) for an egg-shaped sewer flowing two-third full is

Less than HMD when flowing full
Equal to HMD when flowing full
None of these
Greater than HMD when flowing full

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Environmental Engineering
The layout of distribution system in which water flows towards the outer periphery is

Grid iron system
Dead end system
Radial system
Ring system

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Environmental Engineering
The detention period and overflow rate respectively for plain sedimentation as compared to sedimentation with coagulation are generally

More and more
More and less
Less and more
Less and less

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Environmental Engineering
In facultative stabilization pond, the sewage is treated by

Dual action of aerobic bacteria and anaerobic bacteria
Aerobic bacteria only
Algae only
Sedimentation

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