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Environmental Engineering in CE

Environmental Engineering in CE
TLV of ammonia, nitrogen dioxide and phenol vapor in air is __________ ppm.

1000
5
2000
100

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Environmental Engineering in CE
Coal washing waste water containing about 3% suspended solids (comprising of clay, slate, stone etc.) is treated for solid particles removal

In clarifiers
In sedimentation tanks equipped with mechanical scrapper
By chemical coagulation
In vacuum filter

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Environmental Engineering in CE
The ratio of oxygen available to the oxygen required for stabilisation of sewage is called the

Biological oxygen demand (BOD)
Oxygen ion concentration
Relative stability
Bacterial stability factor

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Environmental Engineering in CE
In large thermal power stations very fine particulates present in flue gas are removed by

Bag filter
Electrostatic precipitators
Dust catcher
Wet scrubber

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Environmental Engineering in CE
The resistance of water to the passage of light through it is a measure of the

Turbidity
Color
Hardness
Dissolved gases

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Environmental Engineering in CE
Moist atmospheric air at high temperature (e.g., in summer) having high concentration of sulphur dioxide causes

Corrosion, tarnishing & soiling of metals
Fading of dyes on textiles
Reduced strength of textiles
All of these

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