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Environmental Engineering in CE

Environmental Engineering in CE
Threshold Limit Value (TLV) is the maximum allowable concentration (i.e. safe limit) of pollutants in air. Safe limit for SO₂ in air is __________ ppm.

500
2000
5
1000

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Environmental Engineering in CE
Aerodynamic noise resulting from turbulent gas flow is the most prevalent source of valve noise in fluid ilow control. It is caused due to

Reynold stresses
Neither A nor B
Shear forces
Both A & B

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Environmental Engineering in CE
Most of the atmospheric air pollutants are present in large quantity in

Trophosphere
Stratosphere
Thermosphere
Mesosphere

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Environmental Engineering in CE
The most commonly used chemical coagulant in water treatment is

Alum
Lime
Hydrazine
Ferrous sulphate

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Environmental Engineering in CE
The length of rectangular sedimentation tank should not be more than(Where ‘B’ is the width of the tank)

2B
B
4B
8B

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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)
Biological oxygen pond
Filtration
Lagoons

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