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Environmental Engineering

Environmental Engineering
The percentage of filtered water, which is used for backwashing in rapid sand filters, is about

5 to 7
2 to 4
0.2 to 0.4
0.4 to 1.0

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Environmental Engineering
The pipe which is used to carry the discharge from sanitary fittings like bath rooms, kitchens etc. is called

Waste pipe
Anti-siphonage pipe
Soil pipe
Vent pipe

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Environmental Engineering
The settling velocity of a particle in a sedimentation tank increases if

Particle size is decreased
The surface area of tank is increased
None of these
The depth of tank is decreased

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Environmental Engineering
Facultative bacteria are able to work in

Absence of oxygen only
Presence of oxygen only
Presence as well as in absence of oxygen
Presence of water

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

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

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Environmental Engineering
For a given discharge, the efficiency of sedimentation tank can be increased by

Decreasing the surface area of tank
Decreasing the depth of tank
Increasing the surface area of tank
Increasing the depth of tank

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