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Environmental Engineering in CE

Environmental Engineering in CE
Presence of __________ hardness is responsible for the temporary hardness in water.

Choride
Sulphate
Carbonate
Calcium

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Environmental Engineering in CE
A gas is termed as non-toxic, if its maximum permissible concentration (TLV) ranges from __________ ppm.

1000 to 2000
3000 to 6000
10000 to 100000
6000 to 9000

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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

Municipal sewage treatment
Iron & steel plant
Petroleum refinery
Food industry

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Environmental Engineering in CE
Algae growth in water is controlled by

Bleaching
Deoxidation
Aeration
Chlorination

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Environmental Engineering in CE
Noise level in a quiet private business office is about __________ decibels.

85
50
70
25

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Environmental Engineering in CE
The amount of chemical coagulant added for treatment of polluted water __________ with increase in temperature of the polluted water to be treated.

May increase or decrease ; depends on the chemical characteristics of polluted water
Increases
Remains constant
Decreases

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