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Environmental Engineering in CE

Environmental Engineering in CE
Which is a secondary air pollutant?

Sulphur dioxide
Dust particles
Nitrogen dioxide
Photochemical smog

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Environmental Engineering in CE
Aerosols present in atmospheric air may be

Positively charged
Negatively charged
Neutral
Combination of all A, B & C

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Environmental Engineering in CE
The main pollutant in waste water discharged from a petroleum refinery is oil (both in free and emulsified form). Free oil is removed by

Aerated lagoons
Gravity separator having oil skimming devices
Trickling filters
Biological oxygen pond

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Environmental Engineering in CE
Insufficient washing of sand grains in a rapid sand filter causes

Shrinkage of filtering media
Air binding
Mud balls
Expansion of filtering media

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

50
5000
5
2000

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Environmental Engineering in CE
Which of the following is not a natural source of air pollution?

Volcanic eruptions and lightening discharges
Biological decay of vegetable matter
None of these
Photochemical oxidation of organic matter

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MORE MCQ ON Environmental Engineering in CE

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