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Environmental Engineering

Environmental Engineering
A sewer that receives the discharge of a number of house sewers is called

House sewer
Sub-main sewer
Lateral sewer
Intercepting sewer

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Environmental Engineering
The amount of residual chlorine left in public water supply for safety against pathogenic bacteria is about

1.0 to 5.0 ppm
0.5 to 1.0 ppm
0.05 to 0.5 ppm
0.01 to 0.05 ppm

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Environmental Engineering
The detention period for oxidation ponds is usually kept as

3 months
48 hours
24 hours
10 to 15 days

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Environmental Engineering
The effective size of sand particles used in slow sand filters is

0.35 to 0.60 mm
0.60 to 1.00 mm
0.25 to 0.35 mm
1.00 to 1.80 mm

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Environmental Engineering
The disinfection efficiency of chlorine increases by (i) Decreasing the time of contact (ii) Decreasing the temperature of water (iii) Increasing the temperature of water

Both (i) and (iii)
Only (i)
Both (i) and (ii)
Only (iii)

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Environmental Engineering
The distribution mains are designed for

Maximum daily demand
Average daily demand
Maximum hourly demand
Maximum hourly demand on maximum day

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