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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

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

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Environmental Engineering
In a BOD test, 1.0 ml of raw sewage was diluted to 100 ml and the dissolved oxygen concentration of diluted sample at the beginning was 6 ppm and it was 4 ppm at the end of 5 day incubation at 20°C. The BOD of raw sewage will be

300 ppm
200 ppm
400 ppm
100 ppm

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Environmental Engineering
Standard BOD is measured at

25°C - 3 day
20°C - 5 day
30°C - 5 day
20°C - 1 day

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Environmental Engineering
The correct relation between theoretical oxygen demand (TOD), Biochemical oxygen demand (BOD) and Chemical oxygen demand (COD) is given by

BOD > COD > TOD
COD > BOD > TOD
TOD > BOD > COD
TOD > COD > BOD

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Environmental Engineering
The distribution mains are designed for

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

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Environmental Engineering
Generally the detention period for grit chambers is kept as

12 hours
5 minutes
1 minute
24 hours

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