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Environmental Engineering in CE

Environmental Engineering in CE
In a sedimentation tank, the detention period for water ranges from __________ hours.

24 to 32
2 to 4
16 to 20
8 to 12

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Environmental Engineering in CE
TLV of mercury in potable (drinking) water is about __________ ppm.

5
1
0.1
0.001

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Environmental Engineering in CE
The pH value of potable water should be between

1 to 1.5
6.5 to 8
4 to 5
13 to 14

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Environmental Engineering in CE
Suspended solid present in the waste water generated in blast furnace gas cooling and cleaning plant is removed by

Biological oxygen pond
Filtration
Radial settling tank (thickener) using coagulant (lime & ferrous sulphate)
Lagoons

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Environmental Engineering in CE
Oilish impurities present the effluent discharged from the electroplating industry is normally not removed by

Centrifugation
Ultrafiltration
Floatation & skimming
Chemical coagulation

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Environmental Engineering in CE
The widest explosive limit is of __________ , thereby making it the most explosive gas.

Acetylene
Carbon monoxide
Hydrogen
Petrol vapor

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