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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
0.4 to 1.0
0.2 to 0.4

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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
6 to 8
8 to 10
2 to 4

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Environmental Engineering
Period of cleaning of slow sand filters is about

2 - 3 months
10 - 12 days
1 - 2 year
24 - 48 hours

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Environmental Engineering
Corrosion in concrete sewers is caused by

Chlorine
Nitrogen
Septic conditions
Dissolved oxygen

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Environmental Engineering
For a country like India, where rainfall is mainly confined to one season, the suitable sewerage system will be

Separate system
Partially separate system
Combined system
Partially combined system

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

2 × DWF
3 × DWF
6 × DWF
Equal to dry weather flow (DWF)

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MORE MCQ ON Environmental Engineering

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