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Environmental Engineering in CE

Environmental Engineering in CE
The biological decomposition of organic substances in wastes controlled conditions is called

Incineration
None of these
Biological oxidation
Composting

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Environmental Engineering in CE
Main pollutants released from iron & steel industry is

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

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Environmental Engineering in CE
When the concentration of SO₂ in air is greater than __________ ppm, it gives a pungent smell.

1
4
0.1
0.01

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Environmental Engineering in CE
Tolerable limit of nitrogen oxides in air is __________ ppm.

0.1
1
5
25

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Environmental Engineering in CE
Pollution by particulate matter emission in the atmosphere does not take place during metal

Polishing
Machining
Cutting
Grinding

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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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