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Environmental Engineering

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

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

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Environmental Engineering
The velocity of flow of water in a sedimentation tank is about

15 to 30 cm/minute
15 to 30 cm/hour
15 to 30 cm/sec
5 to 10 cm/sec

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Environmental Engineering
Chlorine demand of water is equal to

Difference of applied and residual chlorine
Applied chlorine
Residual chlorine
Sum of applied and residual chlorine

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

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

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Environmental Engineering
If the coli form bacteria is present in a sample of water, then the coli-form test to be conducted is (i) Presumptive coli-form test (ii) Confirmed coli-form test (iii) Completed coli-form test

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

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Environmental Engineering
Hardy cross method of analysis of distribution system (i) Involves successive trials (ii) Takes economic aspects into account (iii) Is time consuming

(i) and (iii)
Only (i)
All are correct
(i) and (ii)

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