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Environmental Engineering in CE

Environmental Engineering in CE
Green house effect is accentuated by

All of these
Rapid industrialisation
Deforestation
Increased transportation activity

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Environmental Engineering in CE
Maximum allowable concentration of CO₂ in air for safe working is __________ ppm (parts per million).

50
1000
2000
5000

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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
Biological oxygen pond
Trickling filters
Gravity separator having oil skimming devices

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

2000
50
5000
5

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Environmental Engineering in CE
White smoke coming out of the chimney of a furnace indicates the use of

Very high excess air
Low excess air
Gaseous fuel in the furnace
Liquid fuel in the furnace

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Environmental Engineering in CE
Disinfection of water is done to destroy pathogenic bacteria and thus prevent water-borne diseases. Disinfection of water may be done by the use of

All of these
Ultraviolet light for irradiation of water
Chlorine or its compounds
Ozone and iodine

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