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Environmental Engineering in CE

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

Pulverised limestone
Silica gel
Active carbon
Bog iron (iron oxide)

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Environmental Engineering in CE
Which of the following is not a secondary air pollutant?

Ozone
Sulphur dioxide
All of these
Photochemical smog

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Environmental Engineering in CE
Deaeration of high pressure boiler feed water is done to reduce

Its silica content
Its dissolved oxygen content
Foaming from boilers
Caustic embrittlement

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Environmental Engineering in CE
Fresh domestic sewage is __________ in color.

Red
Dark brown
Black
Grey

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Environmental Engineering in CE
Exposure to small amount of __________ results in high blood pressure & heart disease in human beings.

Cadmium
Mercury
Hydrogen sulphide
Asbestos

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Environmental Engineering in CE
Which of the following is the most efficient for removal of very finely divided suspended solids and colloidal matter from the polluted water stream?

Sedimentation tank
Chemical coagulation
Mechanical flocculation
Circular clarifier

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