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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?

Cation exchanger
Chlorine
Irradiation of water by ultraviolet light
Coagulation

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Environmental Engineering in CE
Which of the following is not a source of ozone emission in the atmosphere?

Refrigerators
Dermatological photo-therapy equipments
Xerox machines
High voltage electrical equipments

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Environmental Engineering in CE
Presence of nitrates in water in excess of 50 ppm causes

Gastroentetitis
Asphyxiation
Tooth decay
Mathenoglobenemia

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Environmental Engineering in CE
Inhalation of silica dust by human being causes

Both B & C
Asphyxiation
Shortness of breath
Tuberculosis

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Environmental Engineering in CE
Smog is not formed due to the presence of __________ in the atmosphere.

NOx
CO₂
SO₂
Any of these

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Environmental Engineering in CE
Major sources of noise in furnace operation arises from air inspirators, combustion, side wall vibrations and fluctuation in the process heat load. A 50% increase in fuel firing rate may increase the furnace noise level by about __________ decibels.

100
70
30
3

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