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Environmental Engineering in CE

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

Caustic embrittlement
Suspended silica
Turbidity
Dissolved oxygen

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Environmental Engineering in CE
Main pollutant present in automobile exhaust is

CO₂
CO
NO
Hydrocarbons

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

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

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Environmental Engineering in CE
Disinfection of water is done to destroy pathogenic bacteria and thus prevent water-borne diseases. Disinfection of water may be done by the use of

Ozone and iodine
Chlorine or its compounds
All of these
Ultraviolet light for irradiation of water

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Environmental Engineering in CE
Cleaning is done by(i) Scraping and removal in filters slow sand(ii) Back washing in slow sand filters(iii) Scraping and removal in filters rapid sand(iv) Back washing in rapid sand filtersThe correct answer is

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

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Environmental Engineering in CE
80% less than 200 mesh size particles are called

Aggregates
Smoke
Grit
Powder

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