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Environmental Engineering in CE

Environmental Engineering in CE
Which of the following is the most severe air pollutant?

NOx
SO₂
Hydrocarbons
CO

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Environmental Engineering in CE
Noise level heard at a distance of about 100 metres from a jet engine with after burner is about __________ decibels.

120
140
170
200

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

Suspended silica
Dissolved oxygen
Turbidity
Caustic embrittlement

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Environmental Engineering in CE
Inhalation of silica dust causes a disease called

Bronchitis
Silicosis
Pneumoconiosis
None of these

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Environmental Engineering in CE
TLV of ozone (O₃) and phosgene (COCl₂) in air is __________ ppm.

0.1
100
1000
25

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Environmental Engineering in CE
A gas is termed as non-toxic, if its maximum permissible concentration (TLV) ranges from __________ ppm.

10000 to 100000
1000 to 2000
3000 to 6000
6000 to 9000

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