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Environmental Engineering in CE

Environmental Engineering in CE
Water filtration rate in a slow sand filter ranges from __________ litres/m²/hr.

100 to 200
1500 to 2500
10 to 20
4000 to 5000

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Environmental Engineering in CE
Presence of nitrogen in high concentration in contaminated air reduces partial pressure of oxygen in lungs, thereby causing asphyxia (suffocation) leading to death from oxygen deficiency. Concentration of N₂ in contaminated air at which it acts as a natural asphyxant is ≥ __________ percent.

92
80
84
88

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Environmental Engineering in CE
There are five concentric layers within the atmosphere which is differentiated on the basis of temperature. The atmospheric layer which lies close to the earth's surface in which human being along with other organisms live is called troposphere. The rate at which air temperature in the troposphere gradually decreases with height is about __________ °C/km.

6.5
0.05
1
15

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Environmental Engineering in CE
Inhalation of lead compounds present in the automobile exhausts (using leaded petrol) causes

Anaemia
Nervous system disorder
Blood poisoning
All of these

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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

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

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

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

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