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Environmental Engineering

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

Nil
Fluctuating
To decrease it
To increase it

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

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Environmental Engineering
Dissolved oxygen in streams is

Maximum at noon
Minimum at noon
Same throughout the day
Maximum at midnight

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Environmental Engineering
The overflow rate for plain sedimentation tanks is about

1500 to 2000 liters/hour/m²
1000 to 1250 liters/hour/ m²
1250 to 1500 liters/hour/m²
500 to 750 liters/hour/ m²

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

0.0001 ppm
0.1 ppm
0.001 ppm
0.01 ppm

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Environmental Engineering
Percentage of bacterial load that can be removed from water by the process of plain sedimentation is about

100
59
50
75

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