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Environmental Engineering in CE

Environmental Engineering in CE
__________ substances present in sewage are removed in grit chamber during sewage treatment.

Inorganic
Fatty
Dissolved
Organic

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Environmental Engineering in CE
The pH value of potable water should be between

6.5 to 8
4 to 5
13 to 14
1 to 1.5

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Environmental Engineering in CE
Septic tank is a(i) Settling tank(ii) Digestion tank(iii) Aeration tank

(i) and (ii)
Only (i)
(i) and (iii)
Only (iii)

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Environmental Engineering in CE
Moist atmospheric air at high temperature (e.g., in summer) having high concentration of sulphur dioxide causes

Reduced strength of textiles
All of these
Fading of dyes on textiles
Corrosion, tarnishing & soiling of metals

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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

Gravity separator having oil skimming devices
Biological oxygen pond
Trickling filters
Aerated lagoons

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Environmental Engineering in CE
There are five concentric layers within the atmosphere which is differentiated on the basis of temperature. The atmospheric layer which lies close to the earth's surface in which human being along with other organisms live is called troposphere. The rate at which air temperature in the troposphere gradually decreases with height is about __________ °C/km.

0.05
6.5
1
15

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