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Environmental Engineering in CE

Environmental Engineering in CE
Which of the following is a secondary air pollutant?

Sulphur dioxide
Photochemical smog
Dust particles
Nitrogen dioxide

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Environmental Engineering in CE
Scale formation in boiler is controlled by

Preheating of feed water
Eliminating H₂S in feed water
Keeping the pH value of feed water just below 7
Reduction in hardness, silica & alumina in feed water

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Environmental Engineering in CE
Removal of __________ is accomplished by aeration of water.

Dissolved gases
Dissolved solids
None of these
Suspended solids

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Environmental Engineering in CE
Polyvinyl chloride containers are not suitable for storing

Metallic powder
Foodstuffs
Woolen clothes
None of these

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Environmental Engineering in CE
Beyond what concentration of H₂S in air, acute danger to human life exists?

300 ppm
700 ppm
100 ppm
50 ppm

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Environmental Engineering in CE
Fine grit present in sewage is removed in the __________ during sewage treatment.

Trickling filter
Skimming tank
Grit chamber
Detritus tank

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