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Environmental Engineering

Environmental Engineering
The hourly variation factor is usually taken as

2.7
1.8
1.5
2.0

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Environmental Engineering
Corrosion in concrete sewers is caused by

Nitrogen
Chlorine
Septic conditions
Dissolved oxygen

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Environmental Engineering
The settling velocity of a particle in a sedimentation tank depends on

Surface area of tank
Depth of tank
None of these
Both depth and surface area of tank

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Environmental Engineering
Settling velocity increases with

Depth of tank
Temperature of liquid
Specific gravity of solid particles
Size of particles

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Environmental Engineering
The phenolic compounds in public water supply should not be more than

0.01 ppm
0.0001 ppm
0.001 ppm
0.1 ppm

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Environmental Engineering
The design discharge for the combined sewer system shall be taken as

Rainfall + DWF
Rainfall + 2 DWF
Equal to rainfall
Rainfall + 6 DWF

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