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Environmental Engineering in CE

Environmental Engineering in CE
Noise emitted by a ventilation fan at a distance of 3 metres is about __________ decibels.

85
105
145
125

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Environmental Engineering in CE
Acute danger to human life (i.e. death) exists, if the concentration of CO₂ in atmospheric air exceeds __________ percent (by volume).

3
7
1
20

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Environmental Engineering in CE
If carbon monoxide content in atmospheric air exceeds __________ ppm, death is bound to occur.

1000
500
3000 (i.e. 0.3%)
50

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Environmental Engineering in CE
In the context of the chemical process industries, the term BOD is normally associated with the

Characterisation of solid wastes
Characterisation of liquid effluents
Characterisation of boiler feed water
Organic concentration in gaseous effluents

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Environmental Engineering in CE
World environment day is observed every year on the 5th of

September
December
July
June

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Environmental Engineering in CE
High noise level in a chemical plant can be controlled by the

Suppression of noise at the source itself
All of these
Path control of noise
Protection of operating personnel

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