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Environmental Engineering

Environmental Engineering
If Biochemical oxygen demand (BOD) of a town is 20000 kg/day and BOD per capita per day is 0.05 kg, then population equivalent of town is

1000
1,00,000
4000
4,00,000

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Environmental Engineering
Disinfection efficiency is

Reduced at higher pH value of water
Unaffected by pH value of water
Highest at pH value equal to 7
Increased at higher pH value of water

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Environmental Engineering
The detention period and overflow rate respectively for plain sedimentation as compared to sedimentation with coagulation are generally

Less and more
Less and less
More and less
More and more

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

To decrease it
Nil
Fluctuating
To increase it

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Environmental Engineering
Which of the following retards the self purification of stream?

Higher temperature
None of these
Sunlight
Satisfying oxygen demand

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Environmental Engineering
The detention period in coagulation tanks is usually kept as

2 to 6 hours
30 to 45 minutes
2 to 6 days
1 to 2 minutes

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