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Environmental Engineering in CE

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

5000
50
5
2000

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Environmental Engineering in CE
Most of the bacteria in sewage are

Parasitic
None of these
Saprophytic
Anerobic

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Environmental Engineering in CE
Tri-sodium phosphate is used in boiler water treatment to reduce

Turbidity
Suspended silica
Dissolved oxygen
Caustic embrittlement

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Environmental Engineering in CE
Dust collection efficiency of a cyclone separator depends upon its

All of these
Overall height
Inlet gas velocity
Diameter

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Environmental Engineering in CE
Maximum permissible limit of industrial noise as recommended by World Health Organisation (WHO) is __________ decibels.

95
35
75
105

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Environmental Engineering in CE
Which of the following is the most active zone of atmosphere in which weathering events like rain, storm & lightning occur?

None of these
Thermosphere
Troposphere
Stratosphere

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