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Environmental Engineering in CE

Environmental Engineering in CE
BOD of raw municipal sewage may be in the range of about __________ mg/litre.

1-2
2000-3000
150-300
5-10

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Environmental Engineering in CE
Main pollutants released from petroleum refineries is

CO₂, H₂S & NO₂
SO₃, NO₂ & CO₂
CO, SO₂ & H₂S
CO₂, NO & SO₃

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Environmental Engineering in CE
Presence of carbon monoxide in atmosphere produced by decomposition of chlorophyl and haemoglobin breakdown of some animals, beyond TLV (>50 ppm)

Acts as a green house gas thereby raising earth's temperature
Causes asphyxia
Inhances the green house effect
Causes increase in sea level

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Environmental Engineering in CE
Inhalation of lead compounds present in automobile exhaust (using leaded petrol) causes

All of these
Blood poisoning
Anaemia
Nervous system disorder

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Environmental Engineering in CE
Presence of soluble organics in polluted water causes

Fire hazards
Depletion of oxygen
Explosion hazards
Undesirable plants growth

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Environmental Engineering in CE
Most of the bacteria in sewage are

Anerobic
Saprophytic
None of these
Parasitic

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