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Environmental Engineering in CE

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

1000
0.1
25
100

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Environmental Engineering in CE
The widest explosive limit is of __________ , thereby making it the most explosive gas.

Hydrogen
Petrol vapor
Carbon monoxide
Acetylene

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Environmental Engineering in CE
Maximum permissible turbidity in potable water is __________ ppm.

1
1000
10
250

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Environmental Engineering in CE
Radioactive substances present in the polluted water stream can be removed by

Biological oxygen treatment
None of these
Coagulation and filtration
Adsorption in ion exchange materials

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Environmental Engineering in CE
Black smoke coming out of the chimney of a furnace is an indication of the use of __________ in the furnace.

Large quantity of excess combustion air
Pulverised coal as fuel
Hydrocarbon fuel
Low amount of excess combustion air

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Environmental Engineering in CE
Which of the following pollutants is not emitted during volcanic eruptions?

SO₂
H₂S
CO
Hydrocarbons

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