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Environmental Engineering in CE

Environmental Engineering in CE
Pollution by particulate matter emission in the atmosphere does not take place during metal

Machining
Grinding
Polishing
Cutting

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Environmental Engineering in CE
5-200 μm size particles are called

Smoke
Colloids or aerosols
Powder
Dust

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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?

Mechanical flocculation
Chemical coagulation
Sedimentation tank
Circular clarifier

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Environmental Engineering in CE
Acute danger to human life (i.e. death) exists, if the concentration of CO₂ in atmospheric air exceeds __________ percent (by volume).

20
1
7
3

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Environmental Engineering in CE
High noise level in a chemical plant can be controlled by the

Protection of operating personnel
All of these
Suppression of noise at the source itself
Path control of noise

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Environmental Engineering in CE
Noise level heard inside a bus in busy city traffic or inside a sub-way train corresponds to about __________ decibels.

75
95
140
120

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