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Environmental Engineering in CE

Environmental Engineering in CE
Inorganic impurities causing water pollution is

Salts of metals
Carbohydrates
Protein
Fats

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Environmental Engineering in CE
Threshold limit value (TLV) of CO in air is __________ ppm.

5000
5
50
2000

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Environmental Engineering in CE
Which of the following is the most severe air pollutant?

SO₂
Hydrocarbons
NOx
CO

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Environmental Engineering in CE
Which of the following is the most efficient for removal of very finely divided suspended solids and colloidal matter from the polluted water stream?

Mechanical flocculation
Circular clarifier
Sedimentation tank
Chemical coagulation

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Environmental Engineering in CE
White smoke coming out of the chimney of a furnace indicates the use of

Liquid fuel in the furnace
Low excess air
Very high excess air
Gaseous fuel in the furnace

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

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

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