List of top Environmental Engineering Questions on Air and Noise Pollution

Column I presents common air pollutants, and column II presents treatment technologies commonly employed to control air pollutants.
Air pollutantTreatment technology
1Dust (size 5-25 microns)PCyclone separator
2Carbon monoxide (CO)QWet lime-water scrubber
3Sulfur dioxide (SO2)RElectrostatic precipitator
4Fly ash (size < 2.5 microns)SCatalytic converter
The option that CORRECTLY matches the air pollutant with its treatment technology is:
In an industry, a cyclone collector with 80% efficiency is installed for air purification, followed by an electrostatic precipitator with 50% efficiency. The concentration of particles entering the cyclone collector is 10 mg/m\(^3\).

The concentration (in mg/m\(^3\)) of particles exiting the precipitator is (rounded off to two decimal places).

Which of the following statements is/are TRUE in relation to the Maximum Mixing Depth (or Height) ${Dmax}$ in the atmosphere?}

For the elevation and temperature data given in the table, the existing lapse rate in the environment is  °C/100 m (round off to two decimal places).