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Environmental Engineering in CE

Environmental Engineering in CE
Tri-sodium phosphate is used in boiler water treatment to reduce

Turbidity
Suspended silica
Dissolved oxygen
Caustic embrittlement

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

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

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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.

6.5
0.05
15
1

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Environmental Engineering in CE
Which of the following is the most major constituents of air pollutants?

Hydrogen sulphide
Oxides of nitrogen
Oxides of sulphur
Carbon monoxide

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Environmental Engineering in CE
Maximum permissible limit of mercury in human blood is __________ micrograms/100 c.c.

7
1
82
19

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Environmental Engineering in CE
Water effluent generated in printing industry is decolourised by

Ion exchange technique
Reverse osmosis
Electrolytic decomposition
Adsorption

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