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Environmental Engineering in CE

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

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

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Environmental Engineering in CE
Presence of volatile compounds like gasoline, oil, alcohol, ether etc. in municipal sewers may cause

Explosion
Undesirable plant growth
Non biodegradable foam
Corrosion

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Environmental Engineering in CE
Which is the most widely used coagulant for the treatment of turbid water?

Lime
Ferric chloride
Alum (aluminium sulphate)
Sodium aluminate

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Environmental Engineering in CE
Death may occur, when SO₂ concentration in atmospheric air exceeds __________ ppm.

200
100
20
400

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Environmental Engineering in CE
Noise level audible to audience sitting in the 5th row from the stage during a large orchestra show corresponds to about __________ decibels.

105
185
135
160

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Environmental Engineering in CE
__________ content of the phosphate rock is the pollutant of primary interest in a phos-phatic fertiliser plant.

Phosphorous
Sulphur
Calcium
Fluorine

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