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Environmental Engineering in CE

Environmental Engineering in CE
Which of the following plants does not emit appreciable amount of SO₂ in atmosphere?

Nitric acid plant
Thermal power plant
Petroleum refinery
Sulphuric acid plant

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Environmental Engineering in CE
Ozone is

A primary pollutant
Both B & C
Impervious to ultra-violet rays
A secondary pollutant

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Environmental Engineering in CE
As compared to rapid sand filters, slow sand filters give
(i) Slower filtration rate
(ii) Higher filtration rate
(iii) Lesser efficiency in removal of bacteria
(iv) Higher efficiency in removal of bacteria
The correct answer is

(ii) and (iii)
(i) and (ii)
(i) and (iv)
(ii) and (iv)

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Environmental Engineering in CE
Iron & manganese present in the polluted water is removed by

Oxidation followed by settling & filtration
Chemical coagulation
Chlorination only
Simple filtration

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Environmental Engineering in CE
Threshold limit value (TLV) of CO in air is __________ ppm.

5
2000
5000
50

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Environmental Engineering in CE
Reinglemann chart is used for the measurement of the

Smoke density from a chimey
Flue gas temperature
Exhaust gas density
Combustibles present in automobile exhaust

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