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Environmental Engineering in CE

Environmental Engineering in CE
Which of the following is an adsorbant used for the removal of SO₂ from gas/air?

Active carbon
Bog iron
Limestone powder or alkalised alumina
Silica gel

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Environmental Engineering in CE
Ozone is

Impervious to ultra-violet rays
A primary pollutant
Both B & C
A secondary pollutant

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Environmental Engineering in CE
The biological decomposition of organic substances in wastes controlled conditions is called

Biological oxidation
Incineration
None of these
Composting

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

5000
50
5
2000

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Environmental Engineering in CE
Corrosion in boilers can be prevented by

Deaeration of feed water
Enhancing pH of feed water by adding alkali
All of these
Feeding sodium sulphite or hydrazine phosphate to the boilers, which combines with oxygen and prevents corrosion

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Environmental Engineering in CE
The major reason of hydrodynamic noise (i.e., noise resulting from liquid flow) is

Fluctuation in liquid flow
Boundary layer separation
Pipe vibrations
Cavitation

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