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Environmental Engineering

Environmental Engineering
Sewerage system is usually designed for

25 years
27 years
26 years
28 years

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Environmental Engineering
If the time of concentration is 9 minutes, then the intensity of rainfall according to British Ministry of Health formula will be

20 mm/hr
40 mm/hr
10 mm/hr
4 mm/hr

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Environmental Engineering
Activated carbon is used for

Removing corrosiveness
Disinfection
Removing odours
Removing hardness

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

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

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Environmental Engineering
The slope of sewer shall be

Given in the direction opposite to natural slope of ground
Steeper than 1 in 20
Zero
Given in the direction of natural slope of ground

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Environmental Engineering
Alum as a coagulant is found to be most effective when pH range of water is

4 to 6
8 to 10
2 to 4
6 to 8

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