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Environmental Engineering in CE

Environmental Engineering in CE
The major reason of hydrodynamic noise (i.e., noise resulting from liquid flow) is

Pipe vibrations
Boundary layer separation
Fluctuation in liquid flow
Cavitation

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Environmental Engineering in CE
Maximum allowable concentration of CO₂ in air for safe working is __________ ppm (parts per million).

5000
50
1000
2000

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Environmental Engineering in CE
H₂S present in gaseous stream can be removed by adsorption on

Active carbon
Bog iron
Silica gel
Limestone powder

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Environmental Engineering in CE
Particulates (< 1μm size) remaining suspended in air indefinitely and transported by wind currents are called

Fumes
Aerosols
Mists
Smoke

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Environmental Engineering in CE
Ionisation potential employed in the industrial electrostatic precipitator is of the order of

230 V DC
30 to 70 kV AC
30 to 70 kV DC
230 V AC

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Environmental Engineering in CE
Beyond what concentration of H₂S in air, acute danger to human life exists?

300 ppm
100 ppm
700 ppm
50 ppm

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