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Environmental Engineering in CE

Environmental Engineering in CE
The term Biological Oxygen Demand (BOD) is used in relation to

Industrial effluents
Distilled water
Potable water
Cooling water

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Environmental Engineering in CE
Sound produced by an automobile horn heard at a distance of 1.5 metres corresponds to about __________ decibels.

180
150
90
120

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Environmental Engineering in CE
The common pollutant generated in chlor-alkali industry and battery manufacture is

Brine
None of these
Phosphate
Mercury

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Environmental Engineering in CE
Corrosion in boilers can be prevented by

Deaeration of feed water
All of these
Feeding sodium sulphite or hydrazine phosphate to the boilers, which combines with oxygen and prevents corrosion
Enhancing pH of feed water by adding alkali

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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
Sedimentation tank
Chemical coagulation
Circular clarifier

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Environmental Engineering in CE
Peroxyacyl nitrate (PAN), a pollutant is found in the

Exhaust of sulphuric acid plant
Exhaust of nitric acid plant
Flue gas of coal based power plant
Automobile exhaust

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