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Environmental Engineering in CE

Environmental Engineering in CE
Maximum allowable noise exposure limits for a man working for 8 hours a day in a noisy chemical plant is about __________ decibels.

90
20
60
120

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Environmental Engineering in CE
In a sedimentation tank, the detention period for water ranges from __________ hours.

8 to 12
24 to 32
16 to 20
2 to 4

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Environmental Engineering in CE
TLV of ammonia, nitrogen dioxide and phenol vapor in air is __________ ppm.

2000
5
1000
100

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Environmental Engineering in CE
CFC (chloro fluoro carbon) is very highly reactive in causing depletion of ozone layer in the atmosphere. Each atom of chlorine liberated from CFC is capable of decomposing __________ molecules of ozones.

10⁵
10⁹
10²
10¹⁵

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Environmental Engineering in CE
Threshold limit value (TLV) of CO in air is __________ ppm.

5000
2000
50
5

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

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

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