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ENVIRONMENTAL ENGINEERING IN CE

Environmental Engineering in CE
Major sources of noise in furnace operation arises from air inspirators, combustion, side wall vibrations and fluctuation in the process heat load. A 50% increase in fuel firing rate may increase the furnace noise level by about __________ decibels.

100
3
70
30

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Environmental Engineering in CE
Exposure to chemicals having carcinogenic properties cause

Cancer
Asthma
Dermatitis (skin disorder)
Asphyxiation (suffocation)

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

50 ppm
300 ppm
700 ppm
100 ppm

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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
Water filtration rate in a slow sand filter ranges from __________ litres/m²/hr.

4000 to 5000
1500 to 2500
10 to 20
100 to 200

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