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Environmental Engineering

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

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

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Environmental Engineering
The effect of increasing diameter of sewer on the self cleansing velocity is

To decrease it
Fluctuating
Nil
To increase it

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Environmental Engineering
The biochemical treatment of sewage effluents is essentially a process of

Reduction
Alkalinization
Oxidation
Dehydration

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Environmental Engineering
The maximum permissible limit for fluoride in drinking water is

0.1 mg/liter
5 mg/liter
1.5 mg/liter
10 mg/liter

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Environmental Engineering
Residual chlorine in water is determined by

Orthotolidine method
None of these
Starch iodide method
Both (A) and (B)

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Environmental Engineering
Sewerage system is designed for

Minimum flow only
Maximum and minimum flow
Average flow only
Maximum flow only

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