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Environmental Engineering in CE

Environmental Engineering in CE
Which of the following is the most widely used disinfectant in water treatment?

Irradiation of water by ultraviolet light
Chlorine
Coagulation
Cation exchanger

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Environmental Engineering in CE
Moist atmospheric air at high temperature (e.g., in summer) having high concentration of sulphur dioxide causes

Reduced strength of textiles
All of these
Fading of dyes on textiles
Corrosion, tarnishing & soiling of metals

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Environmental Engineering in CE
Deaeration of high pressure boiler feed water is done to reduce

Foaming from boilers
Its silica content
Caustic embrittlement
Its dissolved oxygen content

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Environmental Engineering in CE
Which is a secondary air pollutant?

Sulphur dioxide
Photochemical smog
Nitrogen dioxide
Dust particles

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Environmental Engineering in CE
Presence of nitrogen in high concentration in contaminated air reduces partial pressure of oxygen in lungs, thereby causing asphyxia (suffocation) leading to death from oxygen deficiency. Concentration of Nā‚‚ in contaminated air at which it acts as a natural asphyxant is ≄ __________ percent.

84
92
88
80

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Environmental Engineering in CE
Irradiation of water by ultraviolet light of suitable wavelength is commonly used for disinfection of water in

Petroleum refinery
Iron & steel plant
Food industry
Municipal sewage treatment

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