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Environmental Engineering in CE

Environmental Engineering in CE
The biological decomposition of organic substances in wastes controlled conditions is called

Biological oxidation
Incineration
None of these
Composting

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Environmental Engineering in CE
The destruction of water-borne pathogens is termed as disinfection of water. Which of the following is a water disinfectant?

Benzene hexachloride
Alkalis
Chlorine
Alkyl benzene sulphonate (ABS)

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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.

3
100
70
30

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

Grit
Powder
Aggregates
Smoke

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Environmental Engineering in CE
The length of rectangular sedimentation tank should not be more than(Where ‘B’ is the width of the tank)

B
2B
4B
8B

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Environmental Engineering in CE
In sewage treatment, the detention period allowed for oxidation ponds ranges from __________ weeks.

1 to 2
4 to 5
9 to 10
15 to 20

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